Journal of the Chemical Society. Perkin transactions II p. 1641 - 1646 (1986)
Update date:2022-08-04
Topics:
Walton, John C.
For cyclohex-2-enylmethyl and 4-alkoxycyclohex-2-enylmethyl radicals the quasi-axial and the quasi-equatorial conformers can both be observed by e.s.r. spectroscopy.Similary, the axial and equatorial conformers of cyclohex-3-enylmethyl radical can be distinguished by e.s.r. spectroscopy.The conformational free-energy difference of the CH2. group in the 2-position, -ΔGdeg300, was found to be 0.17 +/- 0.03 kcal mol-1 and in the 3-position -ΔGdeg300=0.0 +/- 0.1 kcal mol-1.The Arrhenius parameters for inversion of the half-chair conformation of cyclohex-2-enylmethyl radical were determined by lineshape analysis of the exchange-broadened spectra and found to be: log(kf/s-1)=12.3 - (5.7 kcal mol-1)/2.3RT and log(kb/s-1)=12.0 - (5.5 kcal mol-1)/2.3RT.The barrier to rotation about the C.α-Cβ bond in a cyclohexenylmethyl radicals is much less than the barrier in a cyclohexylmethyl radical because the former radical has only one syn-axial hydrogen on C(5) to impede the rotation whereas the latter radical has two syn-axial hydrogens on C(3) and C(5).
View MoreContact:+86-158-05817090
Address:ROOM 9F, FLAT 2, GUODU DEVELOPING BLDG, No.182, ZHAOHUI ROAD
Changzhou Qidi Chemical Co., Ltd
website:http://www.czqdhg.com/
Contact:86-519-83382137
Address:128-1-16# HuaYuan Street,Hutang Town,Wujin District,Changzhou City,P.R.China.
shanghai meicheng chemical co .,ltd(expird)
Contact:+86-21-50677091
Address:Room 302, Building 7, No.1000, Jinhai Road
Contact:+8618766299236
Address:ROOM808, BUILDING2,NO.230 SHEN ZHEN ROAD, LAOSHAN DISTRICT
Fujian Wanke Pharmaceutical Co., LTD.
Contact:+86-598-5026002
Address:Economic development zone,jiangle county
Doi:10.1021/np200324x
(2011)Doi:10.1021/ic9708430
(1998)Doi:10.1021/jo01260a004
(1969)Doi:10.1016/S0040-4039(01)98913-0
(1968)Doi:10.1039/c2cc32778c
(2012)Doi:10.1016/S0040-4020(01)96005-3
(1990)
