Coupling constants alicyclics

Table 2.4. Typical HH coupling constants (Hz) of some units in alicycles, alkenes and alkynes ...

Table 3.7. One-Bond Coupling Constants T11 of some Alicyclic and Aromatic Carbons.

S. Berger, The conformational dependence of vicinal 13C13C spin-spin coupling constants in alicyclic compounds, Org. Magn. Reson., 14 (1980) 65-68. 

Doddrell et al. (80, 66) have examined the angular dependence of V(C-C) in a number of aliphatic and alicyclic alcohols. In contrast to the carboxylic acids, 37(C-C) is observed to be a maximum, 5-4 Hz, for a dihedral angle near 0°. For the trans arrangement, — 180°, 3/(C-C) is 3-2 Hz. At dihedral angles of 90 and 270°, 3/(C-C) is less than 0-4 Hz. Observed 3/(C-C) values for the alcohols and carboxylic acids (66, 80, 52) have been compared with values calculated (INDO-FPT) for the model compounds butane, 2-butanol, and butanoic acid. The calculated coupling constants are given in Table V. (80) Also, experimental and calculated 3J(C-C) values for the carboxylic acids are shown in Fig. 2. The calculations, which assumed only the Fermi contact... 

Not surprisingly, the increasing structural importance of n.m.r. in structural alicyclic chemistry has produced a number of papers dealing with simple five- and six-membered ring systems. For example, in a survey study of the conformational and substituent dependence of coupling constants, the chemical shifts and observed couplings in methyl-enriched cis and Irons (as a 50 50 mixture) 4-t-... 

Chemical Shifts and Coupling Constants of Saturated Alicyclic Hydrocarbons (Sin ppm relative to TMS, J in Hz)... 

H-Chemical Shifts (6 in ppm relative to TMS) and Coupling Constants (J in Hz) in Saturated Alicyclics... 

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