Crystal structure and Hirshfeld surface analysis of 1,3,3,4,4,5,5-hepta­fluoro-2-(3-[(2,3,3,4,4,5,5-hepta­fluoro­cyclo­penten-1-yl)­oxy]-2-{[(2,3,3,4,4,5,5-hepta­fluoro­cyclo­penten-1-yl)­oxy]meth­yl}-2-methyl­prop­oxy)cyclo­pentene

In the title compound, a central sp³-hybridized carbon atom is decorated with three hepta­fluoro-2-meth­yloxy(cyclo­pent-1-ene) arms and a methyl group. The primary packing is determined by C—F⋯F—C inter­actions, forming [001] chains, which are consolidated via weaker C—F⋯F—C and C—H⋯F—C contacts.

Abstract

In the title compound, C₂₀H₉F₂₁O₃, a central sp³-hybridized carbon atom is decorated with three hepta­fluoro-2-meth­yloxy(cyclo­pent-1-ene) arms and a methyl group. The primary packing is determined by C—F⋯F—C inter­actions, forming [001] chains, which are consolidated via weaker C—F⋯F—C and C—H⋯F—C contacts. A Hirshfeld surface analysis was conducted to aid in the visualization of these various influences on the packing: this revealed that the largest contribution to the surface contacts arises from F⋯F inter­actions (53.5%), followed by F⋯H/H⋯F (34.5%) and F⋯C/C⋯F (7.1%).

1. Chemical context

Perfluoro­cyclo­pentene (C₅F₈; PFCP) is known to be selectively reactive towards nucleophilic addition at the fluoro­olefin, via simultaneous addition at the 1- and 5-positions or controlled to only add at the 1-position (Alvino et al., 2020 ▸). In the former case, the fluorine atom in the 5-position is latently reactive and can be utilized to create more complex fluorinated mol­ecules and materials (Lauer et al., 2024 ▸). As such, the synthesis and single-crystal structure of the title compound, C₂₀H₉F₂O₃, is reported herein. This mol­ecule was designed to be tri-functional, in that it contains three latently reactive fluorine atoms, which could be employed in designing more complex materials, such as a dendrimer core or for cross-linking (Abbasi et al., 2014 ▸; Weerasinghe et al., 2023 ▸).

2. Structural commentary

The structure of the title highly fluorinated alkyl ether mol­ecule, C₂₀H₉F₂₁O₃, consists of a central sp³-hybridized carbon atom (C19) covalently bound to a methyl group (C20) and three hepta­fluoro-2-meth­yloxy(cyclo­pent-1-ene) arms (Fig. 1 ▸). The geometry around C19 is nearly that of an ideal tetra­hedral sp³ geometry, with an average C—C—C bond angle of 109.47^o. Using a plane defined by C16, C17 and C18, the three non-methyl carbon atoms bound to the sp³ carbon atom as reference, two of the ether oxygen atoms (O1 and O3) are oriented to the methyl side of the plane, with the third ether oxygen atom (O2) below the plane. Within the cyclo­pentenyl rings, the C=C double-bond lengths range from 1.328 (3) to 1.334 (3) Å. The C—C single bonds to either side of the C=C double bond are approximately 0.15 Å longer, ranging from 1.478 (3) to 1.497 (2) Å. The final two C—C single bonds in the ring are longer yet, ranging from 1.537 (3) to 1.554 (3) Å. The r.m.s. cyclo­pentenyl ring plane angle with respect to the plane defined by its corresponding C_ether—Csp³—C_meth­yl fragment range from 14.62 (15) to 40.25 (13)°.

Figure 1.

The mol­ecular structure of the title compound. Displacement ellipsoids are shown at the 50% probability level.

3. Supra­molecular features

The primary directional inter­action in the extended structure occurs as a short C—F⋯F—C inter­action between F2 and F7ⁱ [symmetry code: (i) x − 1, y, z] at 2.5983 (16) Å, compared to a van der Waals separation of about 2.94 Å. This inter­action contributes to the formation of chains propagating along the a-axis direction (Fig. 2 ▸). The packing is consolidated in the crystallographic c-axis direction via a weak C—F⋯F—C inter­action between F7 and F13ⁱⁱ [symmetry code: (ii) x,  − y,  + z] at 2.6848 (15) Å and in the b-axis direction by a C—H⋯F hydrogen bond between C17—H17A and F9ⁱⁱⁱ [symmetry code: (iii) 1 − x, − + y,  − z] at 2.546 (2) Å [angle = 127.61 (14)°].

Figure 2.

Part of the packing of the title compound showing chains formed by short C—F⋯F—C inter­actions, propagating along the a-axis direction.

Hirshfeld surface analysis was used to investigate the presence of hydrogen bonds and inter­molecular inter­actions in the crystal structure. The Hirshfeld surface analysis (Spackman & Jayatilaka, 2009 ▸) and the associated two-dimensional fingerprint plots (Spackman & McKinnon, 2002 ▸) were generated by CrystalExplorer17.5 (Turner et al., 2017 ▸), using a standard surface resolution. The pale-red spots symbolize short contacts and negative d_norm values on the corresponding surface plots shown in Fig. 3 ▸, associated with their relative contributions to the Hirshfeld surface.

Figure 3.

Map of d_norm onto the Hirshfeld surface for the title compound.

The largest contribution to the overall crystal packing in the title compound is from F⋯F inter­actions (53.3%), represented as a single, central spike on the fingerprint plot at 1.30 Å < (d_i + d_e) < 1.35 Å (Fig. 4 ▸, Table 1 ▸). A significant portion of the inter­molecular inter­actions can also be attributed to F⋯H/H⋯F inter­actions (34.5%), visible on the fingerprint plot as a pair of spikes at 1.15 Å < (d_i + d_e) < 1.35 Å. The remaining 12% of the inter­actions are attributed to F⋯C/C⋯F, F⋯O/O⋯F, and H⋯H contacts.

Figure 4.

The overall two-dimensional fingerprint plot for the title compound.

Table 1. Percentage contribution of inter-atomic contacts to the Hirshfeld surface for the title compound.

Contact	Percentage contribution
F⋯F	53.5
F⋯H/H⋯F	34.5
F⋯C/C⋯F	7.1
F⋯O/O⋯F	3.0
H⋯H	2.1

4. Database survey

A search of the November 2023 release of the Cambridge Structure Database (CSD; Groom et al., 2016 ▸), with updates through September 2024, was performed using the program ConQuest (Bruno et al., 2002 ▸). A for search the perfluoro­cyclo­pentene-ether moiety yielded one result, 4,4′-bis­[(2,3,3,4,4,5,5-hepta­fluoro­cyclo­pent-1-en-1-yl)­oxy]biphenyl (CSD refcode GILXUW; Sharma et al., 2013 ▸). This compound contains a pair of perfluoro­cyclo­pentenyl rings bound through an ether linkage to a 4,4′-bis­phenol aromatic core. A short ring C=C bond is observed, flanked by two medium length C—C bonds and two long C—C bonds to complete the ring, similar to the pattern observed in the title compound. A search for the non-fluorinated analog yielded four results. While the C=C double bond is clearly observed, the remaining four C—C bonds within the ring are more similar in bond length to one another.

5. Synthesis and crystallization

The title compound was prepared by a modified literature procedure (Alvino et al., 2020 ▸) using di­methyl­formamide (DMF) (20 ml), perfluoro­cyclo­pentene (3.0 ml, 22.4 mmol), tri­methyl­olethane (0.81 g, 6.7 mmol), and tri­ethyl­amine (2.8 ml, 20.2 mmol). The isolated compound (1.0 g) was purified using a plug of silica gel and 80 ml of a 1:3 hexa­ne:ethyl acetate solution. All volatiles were removed under reduced pressure and the compound was obtained as a faint yellow, waxy solid (0.57 g, 57%). Crystals of the title compound, in the form of faint-yellow rectangular prisms, were obtained by slow evaporation from diethyl ether solution. ¹H NMR (500 MHz, CDCl₃): δ 4.37 (d, –CH₂–, 6H, J_HF = 2.5 Hz), 1.25 (s, –CH₃, 3H); ¹⁹F NMR (470 MHz, CDCl₃): δ −115.2 (d, 6F, J_FF = 12.7 MHz), −115.8 (d, 6F, J_FF = 10.8), −129.4 (s, 6F), −158.2 (bs, 3F); ¹³C NMR (125 MHz, CDCl₃): δ 72.9 {d, –[(–CH₂)₃CCH₃], J_CF = 4.5 Hz], 41.3 [–(CH₂)₃CCH₃], 15.8 [–(CH₂)₃CCH₃].

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. The coordinates of all H atoms were freely refined.

Table 2. Experimental details.

Crystal data
Chemical formula	C20H9F21O3
M r	696.26
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	100
a, b, c (Å)	7.0271 (1), 19.2243 (1), 17.7558 (1)
β (°)	97.332 (1)
V (Å3)	2379.04 (4)
Z	4
Radiation type	Cu Kα
μ (mm−1)	2.21
Crystal size (mm)	0.23 × 0.09 × 0.07
Data collection
Diffractometer	XtaLAB Synergy, Dualflex, HyPix3000
Absorption correction	Gaussian [CrysAlis PRO; Rigaku OD, 2019 ▸)
Tmin, Tmax	0.681, 1.000
No. of measured, independent and observed [I ≥ 2u(I)] reflections	23552, 4403, 4160
R int	0.020
(sin θ/λ)max (Å−1)	0.605
Refinement
R[F2 > 2σ(F2)], wR(F2), S	0.037, 0.088, 1.07
No. of reflections	4403
No. of parameters	398
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.90, −0.49

Computer programs: CrysAlis PRO (Rigaku OD, 2019 ▸), SHELXT2018/2 (Sheldrick, 2015a ▸), SHELXL2018/3 (Sheldrick, 2015b ▸), Mercury (Macrae et al., 2008) and OLEX2 (Dolomanov et al., 2009 ▸).

Supplementary Material

CCDC reference: 2405292

Additional supporting information: crystallographic information; 3D view; checkCIF report

supplementary crystallographic information

1,3,3,4,4,5,5-Heptafluoro-2-(3-[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]-2-{[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]methyl}-2-methylpropoxy)cyclopentene. Crystal data

C20H9F21O3	F(000) = 1376.511
Mr = 696.26	Dx = 1.944 Mg m−3
Monoclinic, P21/c	Cu Kα radiation, λ = 1.54184 Å
a = 7.0271 (1) Å	Cell parameters from 18314 reflections
b = 19.2243 (1) Å	θ = 3.4–68.7°
c = 17.7558 (1) Å	µ = 2.21 mm−1
β = 97.332 (1)°	T = 100 K
V = 2379.04 (4) Å3	Needle, colourless
Z = 4	0.23 × 0.09 × 0.07 mm

1,3,3,4,4,5,5-Heptafluoro-2-(3-[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]-2-{[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]methyl}-2-methylpropoxy)cyclopentene. Data collection

XtaLAB Synergy, Dualflex, HyPix3000 diffractometer	4403 independent reflections
Radiation source: micro-focus sealed X-ray tube, PhotonJet (Cu) X-ray Source	4160 reflections with I≥ 2u(I)
Mirror monochromator	Rint = 0.020
Detector resolution: 10.0000 pixels mm-1	θmax = 68.9°, θmin = 3.4°
φ and ω scans	h = −8→8
Absorption correction: gaussian [CrysAlisPro; Rigaku OD, 2019)	k = −23→21
Tmin = 0.681, Tmax = 1.000	l = −21→21
23552 measured reflections

1,3,3,4,4,5,5-Heptafluoro-2-(3-[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]-2-{[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]methyl}-2-methylpropoxy)cyclopentene. Refinement

Refinement on F2	13 constraints
Least-squares matrix: full	Primary atom site location: dual
R[F2 > 2σ(F2)] = 0.037	H-atom parameters constrained
wR(F2) = 0.088	w = 1/[σ2(Fo2) + (0.0336P)2 + 2.693P] where P = (Fo2 + 2Fc2)/3
S = 1.07	(Δ/σ)max = 0.001
4403 reflections	Δρmax = 0.90 e Å−3
398 parameters	Δρmin = −0.49 e Å−3
0 restraints

1,3,3,4,4,5,5-Heptafluoro-2-(3-[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]-2-{[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]methyl}-2-methylpropoxy)cyclopentene. Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
F1	0.16671 (15)	0.06887 (6)	0.41851 (6)	0.0265 (3)
F2	0.05627 (16)	0.07023 (7)	0.56596 (7)	0.0360 (3)
F3	0.26356 (18)	−0.01232 (6)	0.56315 (6)	0.0303 (3)
F4	0.29905 (18)	0.15059 (7)	0.64289 (7)	0.0370 (3)
F5	0.4531 (2)	0.05472 (7)	0.67162 (7)	0.0394 (3)
F6	0.60320 (18)	0.18574 (7)	0.58931 (7)	0.0332 (3)
F7	0.69217 (16)	0.07832 (7)	0.57776 (7)	0.0364 (3)
F8	0.54974 (18)	0.40300 (6)	0.39070 (8)	0.0365 (3)
F9	0.6667 (2)	0.53068 (7)	0.32545 (11)	0.0556 (4)
F10	0.8592 (2)	0.50227 (8)	0.42497 (8)	0.0489 (4)
F11	0.9283 (3)	0.51416 (7)	0.24445 (8)	0.0562 (4)
F12	1.12533 (19)	0.48847 (7)	0.34431 (9)	0.0490 (4)
F13	0.92808 (17)	0.38965 (6)	0.20407 (6)	0.0300 (3)
F14	1.11525 (16)	0.36215 (6)	0.30559 (7)	0.0284 (3)
F15	0.53049 (15)	0.16320 (7)	0.06431 (6)	0.0321 (3)
F16	0.26253 (17)	0.22500 (7)	−0.04917 (6)	0.0322 (3)
F17	0.17650 (18)	0.11897 (6)	−0.03126 (6)	0.0321 (3)
F18	0.0027 (2)	0.27674 (7)	0.01901 (7)	0.0436 (3)
F19	−0.13285 (18)	0.17587 (9)	0.00174 (7)	0.0481 (4)
F20	−0.00523 (15)	0.25007 (6)	0.15861 (6)	0.0261 (2)
F21	−0.03121 (15)	0.13923 (6)	0.14101 (7)	0.0276 (3)
O1	0.54484 (17)	0.15167 (7)	0.43624 (7)	0.0201 (3)
O2	0.34863 (17)	0.18994 (7)	0.21007 (7)	0.0187 (3)
O3	0.7469 (2)	0.29766 (7)	0.29659 (8)	0.0249 (3)
C1	0.4486 (2)	0.12012 (9)	0.48619 (10)	0.0176 (4)
C2	0.2853 (3)	0.08400 (10)	0.48122 (10)	0.0192 (4)
C3	0.2388 (3)	0.05780 (10)	0.55538 (11)	0.0223 (4)
C4	0.3839 (3)	0.09592 (10)	0.61344 (10)	0.0237 (4)
C5	0.5398 (3)	0.12188 (10)	0.56695 (10)	0.0215 (4)
C6	0.2748 (2)	0.18792 (9)	0.13720 (10)	0.0172 (4)
C7	0.3486 (3)	0.17718 (10)	0.07275 (10)	0.0210 (4)
C8	0.2073 (3)	0.18092 (10)	0.00375 (10)	0.0226 (4)
C9	0.0244 (3)	0.20780 (12)	0.03398 (11)	0.0276 (4)
C10	0.0619 (3)	0.19687 (10)	0.12074 (10)	0.0192 (4)
C11	0.7822 (3)	0.36440 (9)	0.31298 (10)	0.0196 (4)
C12	0.7004 (3)	0.41170 (10)	0.35294 (11)	0.0234 (4)
C13	0.7921 (3)	0.48097 (10)	0.35442 (12)	0.0291 (4)
C14	0.9557 (3)	0.47250 (10)	0.30511 (12)	0.0280 (4)
C15	0.9490 (3)	0.39496 (10)	0.28019 (10)	0.0210 (4)
C16	0.4700 (2)	0.14610 (9)	0.35623 (10)	0.0178 (4)
H16a	0.4625 (2)	0.09673 (9)	0.34028 (10)	0.0213 (4)*
H16b	0.3401 (2)	0.16670 (9)	0.34662 (10)	0.0213 (4)*
C17	0.5524 (2)	0.17454 (9)	0.22766 (10)	0.0173 (4)
H17a	0.5779 (2)	0.12577 (9)	0.21408 (10)	0.0208 (4)*
H17b	0.6280 (2)	0.20554 (9)	0.19828 (10)	0.0208 (4)*
C18	0.5989 (3)	0.26292 (9)	0.33273 (10)	0.0190 (4)
H18a	0.6218 (3)	0.26940 (9)	0.38846 (10)	0.0229 (4)*
H18b	0.4709 (3)	0.28201 (9)	0.31370 (10)	0.0229 (4)*
C19	0.6095 (2)	0.18591 (9)	0.31262 (10)	0.0163 (3)
C20	0.8146 (2)	0.15762 (10)	0.33228 (10)	0.0200 (4)
H20a	0.8608 (8)	0.1678 (6)	0.3856 (2)	0.0300 (6)*
H20b	0.8145 (4)	0.10719 (14)	0.3242 (7)	0.0300 (6)*
H20c	0.8992 (5)	0.1798 (5)	0.2996 (5)	0.0300 (6)*

1,3,3,4,4,5,5-Heptafluoro-2-(3-[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]-2-{[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]methyl}-2-methylpropoxy)cyclopentene. Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
F1	0.0214 (5)	0.0330 (6)	0.0232 (6)	−0.0069 (5)	−0.0039 (4)	0.0037 (5)
F2	0.0233 (6)	0.0477 (8)	0.0402 (7)	−0.0013 (5)	0.0156 (5)	−0.0023 (6)
F3	0.0451 (7)	0.0206 (6)	0.0263 (6)	−0.0036 (5)	0.0084 (5)	0.0029 (5)
F4	0.0411 (7)	0.0335 (7)	0.0409 (7)	−0.0024 (6)	0.0230 (6)	−0.0146 (6)
F5	0.0514 (8)	0.0411 (7)	0.0236 (6)	−0.0063 (6)	−0.0031 (5)	0.0101 (5)
F6	0.0387 (7)	0.0368 (7)	0.0247 (6)	−0.0157 (5)	0.0061 (5)	−0.0092 (5)
F7	0.0242 (6)	0.0605 (9)	0.0230 (6)	0.0171 (6)	−0.0028 (5)	−0.0048 (6)
F8	0.0366 (7)	0.0267 (6)	0.0502 (8)	−0.0005 (5)	0.0211 (6)	−0.0091 (6)
F9	0.0435 (8)	0.0204 (6)	0.1018 (13)	0.0097 (6)	0.0048 (8)	0.0101 (7)
F10	0.0689 (10)	0.0416 (8)	0.0381 (8)	−0.0207 (7)	0.0138 (7)	−0.0219 (6)
F11	0.1066 (13)	0.0237 (7)	0.0411 (8)	0.0014 (8)	0.0204 (8)	0.0155 (6)
F12	0.0346 (7)	0.0389 (8)	0.0721 (10)	−0.0132 (6)	0.0020 (7)	−0.0240 (7)
F13	0.0411 (7)	0.0338 (7)	0.0151 (5)	−0.0073 (5)	0.0034 (5)	0.0020 (5)
F14	0.0254 (6)	0.0282 (6)	0.0307 (6)	0.0003 (5)	0.0002 (5)	0.0029 (5)
F15	0.0181 (5)	0.0552 (8)	0.0241 (6)	0.0040 (5)	0.0071 (4)	−0.0070 (5)
F16	0.0359 (6)	0.0416 (7)	0.0197 (6)	−0.0083 (5)	0.0063 (5)	0.0070 (5)
F17	0.0421 (7)	0.0334 (7)	0.0202 (6)	−0.0071 (5)	0.0017 (5)	−0.0064 (5)
F18	0.0531 (8)	0.0464 (8)	0.0319 (7)	0.0215 (7)	0.0074 (6)	0.0164 (6)
F19	0.0238 (6)	0.0941 (12)	0.0253 (6)	−0.0156 (7)	−0.0009 (5)	−0.0091 (7)
F20	0.0235 (5)	0.0290 (6)	0.0264 (6)	0.0072 (5)	0.0047 (4)	−0.0029 (5)
F21	0.0226 (5)	0.0294 (6)	0.0316 (6)	−0.0074 (5)	0.0064 (5)	0.0031 (5)
O1	0.0202 (6)	0.0251 (7)	0.0148 (6)	−0.0052 (5)	0.0014 (5)	0.0013 (5)
O2	0.0167 (6)	0.0251 (7)	0.0139 (6)	0.0018 (5)	0.0008 (5)	−0.0010 (5)
O3	0.0336 (7)	0.0160 (6)	0.0279 (7)	−0.0067 (6)	0.0146 (6)	−0.0047 (5)
C1	0.0179 (8)	0.0187 (8)	0.0167 (9)	0.0029 (7)	0.0036 (7)	0.0011 (7)
C2	0.0171 (8)	0.0213 (9)	0.0183 (9)	0.0011 (7)	−0.0006 (7)	0.0001 (7)
C3	0.0211 (9)	0.0226 (9)	0.0244 (10)	0.0010 (7)	0.0079 (7)	0.0003 (8)
C4	0.0306 (10)	0.0238 (10)	0.0175 (9)	0.0019 (8)	0.0064 (8)	−0.0005 (7)
C5	0.0187 (9)	0.0267 (10)	0.0187 (9)	0.0010 (7)	0.0012 (7)	−0.0036 (8)
C6	0.0184 (8)	0.0170 (8)	0.0159 (8)	−0.0009 (7)	0.0012 (7)	0.0008 (7)
C7	0.0176 (8)	0.0265 (10)	0.0194 (9)	−0.0002 (7)	0.0042 (7)	−0.0009 (7)
C8	0.0259 (9)	0.0283 (10)	0.0142 (8)	−0.0044 (8)	0.0050 (7)	0.0005 (7)
C9	0.0211 (9)	0.0411 (12)	0.0197 (10)	0.0005 (8)	−0.0009 (7)	0.0026 (8)
C10	0.0186 (9)	0.0216 (9)	0.0179 (9)	−0.0001 (7)	0.0045 (7)	−0.0004 (7)
C11	0.0266 (9)	0.0153 (9)	0.0162 (8)	−0.0025 (7)	0.0001 (7)	0.0004 (7)
C12	0.0263 (9)	0.0199 (9)	0.0244 (10)	−0.0006 (8)	0.0042 (8)	−0.0005 (8)
C13	0.0358 (11)	0.0162 (9)	0.0342 (11)	0.0024 (8)	0.0009 (9)	−0.0031 (8)
C14	0.0366 (11)	0.0192 (10)	0.0274 (10)	−0.0065 (8)	0.0015 (8)	0.0037 (8)
C15	0.0271 (9)	0.0193 (9)	0.0162 (9)	−0.0022 (7)	0.0012 (7)	0.0022 (7)
C16	0.0191 (8)	0.0196 (9)	0.0139 (8)	−0.0026 (7)	−0.0009 (7)	0.0004 (7)
C17	0.0146 (8)	0.0201 (9)	0.0171 (8)	0.0011 (7)	0.0013 (6)	−0.0011 (7)
C18	0.0212 (9)	0.0170 (9)	0.0198 (9)	−0.0035 (7)	0.0061 (7)	−0.0012 (7)
C19	0.0176 (8)	0.0161 (9)	0.0151 (8)	−0.0007 (7)	0.0015 (6)	−0.0002 (7)
C20	0.0184 (8)	0.0215 (9)	0.0195 (9)	0.0009 (7)	0.0004 (7)	−0.0003 (7)

1,3,3,4,4,5,5-Heptafluoro-2-(3-[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]-2-{[(2,3,3,4,4,5,5-heptafluorocyclopenten-1-yl)oxy]methyl}-2-methylpropoxy)cyclopentene. Geometric parameters (Å, º)

F1—C2	1.335 (2)	C1—C5	1.495 (2)
F2—C3	1.341 (2)	C2—C3	1.485 (3)
F3—C3	1.364 (2)	C3—C4	1.540 (3)
F4—C4	1.347 (2)	C4—C5	1.536 (3)
F5—C4	1.343 (2)	C6—C7	1.331 (3)
F6—C5	1.349 (2)	C6—C10	1.497 (2)
F7—C5	1.354 (2)	C7—C8	1.477 (3)
F8—C12	1.334 (2)	C8—C9	1.543 (3)
F9—C13	1.356 (2)	C9—C10	1.544 (3)
F10—C13	1.345 (3)	C11—C12	1.328 (3)
F11—C14	1.336 (2)	C11—C15	1.494 (3)
F12—C14	1.337 (2)	C12—C13	1.478 (3)
F13—C15	1.345 (2)	C13—C14	1.540 (3)
F14—C15	1.354 (2)	C14—C15	1.554 (3)
F15—C7	1.333 (2)	C16—H16a	0.9900
F16—C8	1.358 (2)	C16—H16b	0.9900
F17—C8	1.348 (2)	C16—C19	1.530 (2)
F18—C9	1.357 (3)	C17—H17a	0.9900
F19—C9	1.328 (2)	C17—H17b	0.9900
F20—C10	1.342 (2)	C17—C19	1.527 (2)
F21—C10	1.359 (2)	C18—H18a	0.9900
O1—C1	1.329 (2)	C18—H18b	0.9900
O1—C16	1.454 (2)	C18—C19	1.527 (2)
O2—C6	1.332 (2)	C19—C20	1.538 (2)
O2—C17	1.457 (2)	C20—H20a	0.9800
O3—C11	1.332 (2)	C20—H20b	0.9800
O3—C18	1.453 (2)	C20—H20c	0.9800
C1—C2	1.334 (3)
C16—O1—C1	117.84 (13)	C15—C11—C12	110.70 (16)
C17—O2—C6	116.93 (13)	C11—C12—F8	127.44 (17)
C18—O3—C11	118.06 (14)	C13—C12—F8	118.43 (17)
C2—C1—O1	134.45 (17)	C13—C12—C11	114.13 (17)
C5—C1—O1	115.95 (15)	F10—C13—F9	105.80 (17)
C5—C1—C2	109.57 (16)	C12—C13—F9	111.57 (17)
C1—C2—F1	127.48 (17)	C12—C13—F10	113.02 (18)
C3—C2—F1	118.77 (15)	C14—C13—F9	110.79 (18)
C3—C2—C1	113.75 (16)	C14—C13—F10	111.31 (17)
F3—C3—F2	105.90 (15)	C14—C13—C12	104.47 (16)
C2—C3—F2	112.73 (16)	F12—C14—F11	108.02 (17)
C2—C3—F3	112.67 (15)	C13—C14—F11	110.69 (18)
C4—C3—F2	112.63 (15)	C13—C14—F12	111.12 (17)
C4—C3—F3	109.73 (15)	C15—C14—F11	110.45 (16)
C4—C3—C2	103.32 (15)	C15—C14—F12	111.18 (17)
F5—C4—F4	107.25 (15)	C15—C14—C13	105.40 (15)
C3—C4—F4	110.08 (16)	F14—C15—F13	106.17 (15)
C3—C4—F5	112.23 (16)	C11—C15—F13	111.80 (15)
C5—C4—F4	109.66 (16)	C11—C15—F14	111.93 (15)
C5—C4—F5	113.06 (16)	C14—C15—F13	110.77 (15)
C5—C4—C3	104.57 (14)	C14—C15—F14	111.00 (15)
F7—C5—F6	107.20 (15)	C14—C15—C11	105.26 (15)
C1—C5—F6	112.84 (16)	H16a—C16—O1	110.45 (9)
C1—C5—F7	110.89 (15)	H16b—C16—O1	110.45 (9)
C4—C5—F6	111.66 (15)	H16b—C16—H16a	108.6
C4—C5—F7	109.16 (16)	C19—C16—O1	106.40 (13)
C4—C5—C1	105.08 (14)	C19—C16—H16a	110.45 (9)
C7—C6—O2	133.91 (17)	C19—C16—H16b	110.45 (9)
C10—C6—O2	116.23 (15)	H17a—C17—O2	110.09 (9)
C10—C6—C7	109.82 (16)	H17b—C17—O2	110.09 (9)
C6—C7—F15	127.73 (17)	H17b—C17—H17a	108.4
C8—C7—F15	117.98 (15)	C19—C17—O2	108.07 (13)
C8—C7—C6	114.29 (16)	C19—C17—H17a	110.09 (9)
F17—C8—F16	105.98 (14)	C19—C17—H17b	110.09 (9)
C7—C8—F16	112.53 (16)	H18a—C18—O3	110.44 (9)
C7—C8—F17	113.01 (16)	H18b—C18—O3	110.44 (9)
C9—C8—F16	110.84 (16)	H18b—C18—H18a	108.6
C9—C8—F17	111.36 (16)	C19—C18—O3	106.45 (14)
C9—C8—C7	103.24 (15)	C19—C18—H18a	110.44 (9)
F19—C9—F18	107.48 (17)	C19—C18—H18b	110.44 (9)
C8—C9—F18	109.68 (16)	C17—C19—C16	108.89 (14)
C8—C9—F19	112.29 (17)	C18—C19—C16	108.24 (14)
C10—C9—F18	109.21 (16)	C18—C19—C17	110.82 (14)
C10—C9—F19	113.19 (16)	C20—C19—C16	110.53 (14)
C10—C9—C8	104.95 (15)	C20—C19—C17	107.11 (14)
F21—C10—F20	106.06 (14)	C20—C19—C18	111.24 (14)
C6—C10—F20	113.34 (15)	H20a—C20—C19	109.5
C6—C10—F21	110.95 (15)	H20b—C20—C19	109.5
C9—C10—F20	111.73 (15)	H20b—C20—H20a	109.5
C9—C10—F21	110.42 (15)	H20c—C20—C19	109.5
C9—C10—C6	104.44 (14)	H20c—C20—H20a	109.5
C12—C11—O3	134.00 (18)	H20c—C20—H20b	109.5
C15—C11—O3	115.30 (16)
F1—C2—C1—O1	0.3 (3)	F14—C15—C14—C13	−119.26 (16)
F1—C2—C1—C5	−177.52 (19)	F15—C7—C6—O2	1.5 (3)
F1—C2—C3—F2	−48.42 (18)	F15—C7—C6—C10	−176.0 (2)
F1—C2—C3—F3	71.38 (17)	F15—C7—C8—F16	−52.69 (18)
F1—C2—C3—C4	−170.27 (17)	F15—C7—C8—F17	67.32 (18)
F2—C3—C2—C1	132.64 (16)	F15—C7—C8—C9	−172.25 (19)
F2—C3—C4—F4	−21.91 (17)	F16—C8—C7—C6	127.91 (17)
F2—C3—C4—F5	97.46 (16)	F16—C8—C9—F18	−19.40 (16)
F2—C3—C4—C5	−139.63 (16)	F16—C8—C9—F19	100.03 (16)
F3—C3—C2—C1	−107.57 (17)	F16—C8—C9—C10	−136.61 (16)
F3—C3—C4—F4	−139.60 (14)	F17—C8—C7—C6	−112.08 (16)
F3—C3—C4—F5	−20.24 (16)	F17—C8—C9—F18	−137.13 (15)
F3—C3—C4—C5	102.68 (15)	F17—C8—C9—F19	−17.70 (17)
F4—C4—C3—C2	100.02 (16)	F17—C8—C9—C10	105.67 (16)
F4—C4—C5—F6	23.43 (17)	F18—C9—C8—C7	101.32 (16)
F4—C4—C5—F7	141.78 (15)	F18—C9—C10—F20	23.24 (17)
F4—C4—C5—C1	−99.23 (16)	F18—C9—C10—F21	141.03 (15)
F5—C4—C3—C2	−140.61 (16)	F18—C9—C10—C6	−99.64 (16)
F5—C4—C5—F6	−96.19 (16)	F19—C9—C8—C7	−139.25 (18)
F5—C4—C5—F7	22.16 (17)	F19—C9—C10—F20	−96.44 (18)
F5—C4—C5—C1	141.15 (16)	F19—C9—C10—F21	21.34 (19)
F6—C5—C1—O1	46.89 (17)	F19—C9—C10—C6	140.67 (18)
F6—C5—C1—C2	−134.85 (16)	F20—C10—C6—O2	46.61 (17)
F6—C5—C4—C3	141.43 (16)	F20—C10—C6—C7	−135.38 (16)
F7—C5—C1—O1	−73.39 (17)	F20—C10—C9—C8	140.77 (16)
F7—C5—C1—C2	104.87 (17)	F21—C10—C6—O2	−72.58 (15)
F7—C5—C4—C3	−100.21 (15)	F21—C10—C6—C7	105.42 (16)
F8—C12—C11—O3	0.8 (3)	F21—C10—C9—C8	−101.44 (16)
F8—C12—C11—C15	−179.4 (2)	O1—C1—C2—C3	179.1 (2)
F8—C12—C13—F9	−59.5 (2)	O1—C1—C5—C4	168.79 (17)
F8—C12—C13—F10	59.58 (19)	O1—C16—C19—C17	173.11 (13)
F8—C12—C13—C14	−179.26 (19)	O1—C16—C19—C18	−66.34 (15)
F9—C13—C12—C11	120.75 (19)	O1—C16—C19—C20	55.72 (15)
F9—C13—C14—F11	−2.68 (19)	O2—C6—C7—C8	−179.2 (2)
F9—C13—C14—F12	117.35 (17)	O2—C6—C10—C9	168.45 (17)
F9—C13—C14—C15	−122.11 (17)	O2—C17—C19—C16	50.98 (15)
F10—C13—C12—C11	−120.16 (18)	O2—C17—C19—C18	−67.96 (15)
F10—C13—C14—F11	−120.11 (17)	O2—C17—C19—C20	170.53 (14)
F10—C13—C14—F12	−0.08 (18)	O3—C11—C12—C13	−179.5 (2)
F10—C13—C14—C15	120.46 (17)	O3—C11—C15—C14	178.33 (17)
F11—C14—C13—C12	117.60 (18)	O3—C18—C19—C16	174.23 (13)
F11—C14—C15—F13	3.45 (19)	O3—C18—C19—C17	−66.43 (15)
F11—C14—C15—F14	121.15 (17)	O3—C18—C19—C20	52.62 (15)
F11—C14—C15—C11	−117.56 (18)	C1—C2—C3—C4	10.78 (17)
F12—C14—C13—C12	−122.37 (17)	C1—C5—C4—C3	18.77 (16)
F12—C14—C15—F13	−116.45 (17)	C2—C3—C4—C5	−17.70 (15)
F12—C14—C15—F14	1.24 (18)	C6—C7—C8—C9	8.35 (19)
F12—C14—C15—C11	122.54 (17)	C6—C10—C9—C8	17.88 (15)
F13—C15—C11—O3	58.00 (17)	C7—C8—C9—C10	−15.89 (16)
F13—C15—C11—C12	−121.86 (17)	C11—C12—C13—C14	1.00 (19)
F13—C15—C14—C13	123.05 (16)	C11—C15—C14—C13	2.03 (16)
F14—C15—C11—O3	−60.98 (16)	C12—C13—C14—C15	−1.83 (17)
F14—C15—C11—C12	119.16 (16)

Funding Statement

Funding for this research was provided by: Air Force Office of Scientific Research.