Synthesis of 2,3-disubstituted 1,3-butadienes from organotin precursors and butadienyllithium reagents. Diels-alder reactivity

Article abstract of DOI:10.1021/ja00068a020

1,4-Bis(trimethylstannyl)-2-butyne (1) and 2,3-bis(trimethylstannyl)-1,3-butadiene (2), versatile synthons for the 2,3-dianion of 1,3-butadiene, have been prepared from either 1,4-dichloro-2-butyne or 2,3-dichloro-1,3-butadiene by reaction with 2 equiv of