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 MoreCerametek Materials（ShenZhen）Co., Ltd.
Contact:+86-755-2324.2554
Address:A3-#9, YongChuan Street, Suite 501
Zhejiang Chemicals Import & Export Corporation (ZHECHEM)
Contact:+86-571-87046953
Address:No. 37, Qingchun Road
Kaiping Genuine Biochemical Pharmaceutical Co.,Ltd.
Contact:+86-750-2881198
Address:No.1, Xinke Road, Shatang Town, Kaiping, Guangdong Province, P.R.China
shijiazhuang alkay chemicals co..ltd(expird)
Contact:86-311-67692035
Address:2601,juntang building,qiaodong district,shijiazhuang
Zhuhai Jiacheng Biological Technology Co., Ltd
Contact:0756-8800233
Address:room 222, Lianhua road , Gongbei ,Zhuhai, Guangdong ,China
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)
