151964-04-4Relevant articles and documents
Preparation of functionally substituted bicyclopropylidenes
De Meijere,Kozhushkov,Zefirov
, p. 681 - 683 (2007/10/02)
Deprotonation of bicyclopropylidene (1) and 7-cyclopropylidenedispiro[2.2.2.1]heptane (2) with butyllithium in tetrahydrofuran affords lithiobicyclopropylidenes, which react with electrophilic reagents to give the correspondingly substituted bicyclopropylidenes 3, 4 in high yields. No selectivity was observed in deprotonation of unsymmetrically spiroanellated bicyclopropylidenes such as 1-cyclopropylidenespiropentane (5) and 1-cyclopropylidenedispiro-[2.0.2.1]heptane (6).