Conformation and configurational assignment of cis and trans 3,4-dimethyl-6-t-butyl-5,6-dihydro-2H-thiopyran-S-oxides and S-methyl cations
作者:Giovanna Barbarella、Alessandro Bongini、Bianca F. Bonini、Massimo Zambianchi、Paolo Zani
DOI:10.1016/s0040-4020(01)88291-0
日期:1991.9
The assignment of the cis and trans configuration of 3,4-dimethyl-6-t-butyl-5,6-dihydro-2H-thiopyran-S-oxides and S-Methyl cations is made by 13C and 17O NMR, and by force field calculations. It is shown that the preferred conformation of all compounds is the half chair and that a previous configurational assignment of the S-oxides should be reversed.
3,4-二甲基-6-叔丁基-5,6-二氢-2H-硫代吡喃-S-氧化物和S-甲基阳离子的顺式和反式构型的归属是通过13 C和17 O NMR进行的,以及通过力场计算。结果表明,所有化合物的优选构型为半椅,并且先前的S-氧化物构型分配应颠倒。