A new synthesis of 2-alkylbuta-1,3-dienes from internal alkenes and 1,4-dichlorobut-2-yne via dialkyl(1,4-dichlorobut-2-en-2-yl)boranes
Abstract
The successive treatment of borane in tetrahydrofuran with sterically-hindered internal alkenes, 1,4-dichlorobut-2-yne, and alkyl-lithium has provided good yields of 2-alkylbuta-1,3-dienes whose alkyl groups are derived from the alkene.