Table 1. Comparison of the ¹¹B and ¹⁹F NMR spectral resonances of boron and fluorine atoms and the O–B bond distances in compounds 1–6 and 10 with B(C₆F₅)₃ and other related compounds of group 13–14 elements with an M O → B(C₆F₅)₃ moiety(s) (M = Ge, Si, Al, B).

S. no.	Compound	11B NMR chemical shift (ppm)	19F NMR chemical shift (ppm)	O–B bond length (Å)	Reference
1	Germanone, (i-Bu)2ATIGe(i-Pr)(O) → B(C6F5)3 (IV)	–4.52 a	(–134, –161, and –166) a	1.473(4)	10
2	Silaaldehyde, L′Si(H) O → B(C6F5)3 (VIII)	–4.70 b	(–132, –162, and –165) b	1.503(3)	12g
3	Silaformyl chloride, IPr·SiH(Cl) O → B(C6F5)3 (IX)	–5.28 c	(–134, –163, and –168) c	1.492(3)	12c
4	Silaacid anhydride, [{PhC(t-BuN)2}Si{ O→B(C6F5)3}O–Si(H) { O→B(C6F5)3}(Nt-Bu)(HNt-Bu)CPh] (X)	(–3.99, and –5.46) c	(–134, –135, –164, –165, –167, and –168) c	1.493(3), and 1.488(3)	12d
5	Monoalumoxane, L*Al O → B(C6F5) (XI)	-4.83 d	(-134, -164, and -166) d	1.444(3)	20
6	Boraacid chloride, IPr → B(Cl) O → B(C6F5) (XII)	-2.7 e	(-131, -160, and -165) e	1.518(3)	21
7	B(C6F5)3	–2.30 a	(–127, –143, and –160) a	—	19
8	Germaacid chloride, (i-Bu)2ATIGe(O)(Cl) → B(C6F5)3 (1)	–2.46 a	(-133, -159, and -165) a	1.493(5)	This work
9	Germaester, (i-Bu)2ATIGe(O)(OSiPh3) → B(C6F5)3 (2)	–2.61 a	(-132, -160, and -165) a	1.497(3)	This work
10	N-Germaacyl pyrrole, (i-Bu)2ATIGe(O)(NC4H4) → B(C6F5)3 (3)	–2.72 a	(–133, –159, and –165) a	1.494(6)	This work
11	Germaynone, (i-Bu)2ATIGe(O)(CCPh) → B(C6F5)3 (4)	–2.79 a	(–133, –161, and –165) a	1.489(4)	This work
12	Germaester, (i-Bu)2ATIGe(O)(Ot-Bu) → B(C6F5)3 (5)	–2.44 a	(–132, –160, and –165) a	1.505(3) and 1.502(3)	This work
13	Germanone, (i-Bu)2ATIGe(O)(Ph) → B(C6F5)3 (6)	–3.12 a	(–133, –160, and –165) a	1.481(3)	This work
14	Germaacyl thioester, (i-Bu)2ATIGe(O)(SPh) → B(C6F5)3 (10)	–2.73 a	(–133, –160, and –165) a	1.501(5)	This work

^aIn CDCl₃.

^bIn CD₂Cl₂.

^cIn THF-d₈.

^dIn C₆D₆/THF-d₈.

^eIn C₆D₆.