Conformational Analysis. XLIII. Stereochemical Studies in the Cyclobutane Ring System<sup>1-3</sup>
作者:Norman L. Allinger、Leonard A. Tushaus
DOI:10.1021/jo01017a057
日期:1965.6
Kasanskii; Lukina, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1951, p. 47,54
作者:Kasanskii、Lukina
DOI:——
日期:——
Carbon-13 NMR spectra of methylated cyclobutanes and ethyl cyclobutane-carboxylates
作者:Ernest L. Eliel、K. Michal Pietrusiewicz
DOI:10.1002/mrc.1270130308
日期:1980.3
AbstractThe 13C NMR spectra of cyclobutane and seven methylated homologs and of ethyl cyclobutanecarboxylate and five isomeric diethyl cyclobutanedicarboxylates are reported and substituent parameters for methyl groups in methylcyclobutanes are calculated. Of note is a sizeable and nearly configuration‐independent upfield shifting γ‐effect.