Cyclopenta[b]thienyl ligand in organometallic chemistry. Studies of the regioselectivity of the synthesis of new σ-element-substituted cyclopenta[b]thiophene derivatives
作者:D. A. Kissounko、M. V. Zabalov、Yu. F. Oprunenko、D. A. Lemenovskii
DOI:10.1007/bf02495775
日期:2000.7
Reactions of 2-ethyl-5-methylcyclopenta[b]thienyllithium (thiopentalenyllithium) (2) with various electrophilic reagents afford σ-element-substituted thiopentalenes. However, the reaction with Ph3SnCl yields only one of two possible isomers,viz, triphenyl(4H-cyclopenta[b] thiophen-4-yl)stannane (4c), whereas the reactions with Me3SiCl, Me3SiCl, or Ph2PCl give both possible isomers,viz., trimethyl(