Preparation of functionally substituted bicyclopropylidenesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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).