Table 2.
H | OH | OCH3 | F* | SCH3 | SeCH3 | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Exp. | Lit. a | Exp. | Lit. a | Exp. | Lit. b | Exp. | Lit. a,c | Exp. | Lit. d,e | Exp. | ||
J 1’-2’ | 7.2 | 6.3 | 4.5 | 4.8 | 3.9 | 4.0 | 1.4 | 1.5 | 8.3 | 8.5 | 8.7 | |
J 1’-2” | 6.1 | 6.4 | 19.7 | 19.7 | ||||||||
J 2’-3’ | 6.9 | 6.3 | 5.3 | 5.2 | 5.2 | 5.4 | 5.0 | 5.1 | 5.8 | 5.5 | 5.7 | |
J 2”-3’ | 3.9 | 4.3 | 21.5 | 21.6 | ||||||||
J 3’-4’ | 3.9 | 4.0 | 5.5 | 5.4 | 5.7 | 5.9 | 8.6 | 8.7 | 2.8 | 2.0 | 2.9 | |
Exp. | Lit.a | Exp. | Lit.a | Exp. | Lit.b | Exp. | Lit. a | Exp. | Lit.e | Exp. | ||
I. | ||||||||||||
North | ||||||||||||
P | 18.0 | 18.0 | 32.4 | 16.0 | 12.5 | 11.0 | 28.6‡ | 21.0 | −22.5 | - | −13.3 | |
ΦM | 38.0 | - | 32.0 | 35.0 | 32.0 | 35.0 | 32.0 | 41 | 32.0 | - | 32.0 | |
II. | ||||||||||||
South | ||||||||||||
P | 141.5 | 162.0 | 156.6 | 167.0 | 144.7 | 171.0 | 38.6‡ | 159.0 | 138.7 | - | 137.6 | |
ΦM | 32.3 | - | 35.0 | 38.0 | 35.0 | 37.0 | 35.0 | 41 | 35.0 | - | 35.0 | |
%S | 67 | 60 | 40 | 47 | 38 | 40 | 32‡ | 13 | 81 | 76 | 84 |
The J1’-2’’ and J2’’-3’ values in this column designate H1’-F2’ and H3’-F2’ coupling, respectively.
These values do not represent a %S conformer, rather a percent of a second starting northern conformer. Neither Pseurot nor the Matlab script were able to fit the data of 4 to both northern and southern conformations; despite varying input conditions, the programs consistently returned two northern conformers.
Table references: