Synthesis, Photochemistry, and Photophysics of Butadiene Derivatives: Influence of the Methyl Group on the Molecular Structure and Photoinduced Behavior
作者:Irena Škorić、Ilijana Kikaš、Margit Kovács、Lajos Fodor、Željko Marinić、Krešimir Molčanov、Biserka Kojić-Prodić、Ottó Horváth
DOI:10.1021/jo200691x
日期:2011.11.4
effect of the methyl substituents is even more dramatic in the case of the dibutadienes. The parent unsubstituted compound undergoes photoinduced intramolecular cycloaddition giving benzobicyclo[3.2.1]octadiene, whereas the photochemical reaction of the corresponding dimethylated derivative shows only geometrical isomerization due to the steric effect of the substituents. Methylgroups on the butadiene
Thermal electrocyclization reactions of benzooctatetraenes and benzodecapentaenes substituted with R=H, Cl, and methyl were studied experimentally and computationally. Methyl and unsubstituted benzooctatetraenes and benzodecapentaenes give the [4.2.0]bicyclooctadiene products by 8 pi,6 pi-electrocyclization. Chlorine substitution led to thermal rearrangement of the initially formed 8 pi,6 pi-electrocyclization intermediates to give unprecedented products. (C) 2013 Elsevier Ltd. All rights reserved.
Sandwich Complexes Containing Bent Palladium Chains