Reactions of 1,4-enynes with the system CH2I2-Et 3Al

Article abstract of DOI:10.1007/s11172-011-0347-9

Reactions of alk-1-en-4-ynes with an excess of the system CH ₂I₂-Et₃Al give 1-cyclopropylmethyl-1,2- diethylcyclopropanes. A decrease in the amount of either component of the system to two equivalents results in cyclopropanation of the double bond only. Under such conditions, conjugated enynes yield a complex mixture of products, while conjugated diynes are inert to the system CH₂I₂-Et ₃Al.