Study of the substituted vinylallene-methylenecyclobutene electrocyclic equilibria. Comparison with the butadiene-cyclobutene and bisallene-bismethylenecyclobutene electrocyclic equilibria
作者:Daniel J. Pasto、Wei Kong
DOI:10.1021/jo00278a010
日期:1989.8
Isomer differentiation by tri-osmium cluster complexation of substituted 1,3-cyclohexadienes
A series of methyl- and dimethyl-substituted 1,3-cyclohexadienes have been prepared from their aromatic analogues via Birch reduction and subsequent isomerisation with Fe(CO)(3) fragments. These ligands were reacted with [Os-3(CO)(10)(CH3CN)(2)] to form tri-osmium decacarbonyl cluster compounds containing the eta(4)-coordinated substituted 1,3-cyclohexadienes. The various isomers of the substituted dienes show a dramatic difference in their reactivity towards the tri-osmium cluster and it is likely that this is due to the steric interactions between the methyl substituents and the cluster framework, with this effect being more marked for the di-substituted ligands.
Thermolysis of 5,5-dimethyl-1,3-cyclohexadiene. Evidence for rearrangement via [1,5] sigmatropic methyl migration
作者:Charles W. Spangler、Deborah L. Boles
DOI:10.1021/jo00972a020
日期:1972.4
Auwers; Peters, Chemische Berichte, 1910, vol. 43, p. 3109