Von Seebach, Malte; Kozhushkov, Sergei I.; Boese, Roland; Benet-Buchholz, Jordi; Yufit, Dmitrii S.; Howard, Judith A. K.; de Meijere, Armin:

A third-generation bicyclopropylidene: straightforward preparation of 15,15'-bis-(hexaspiro[]pentadecylidene) and a C2v-symmetric branched [15]triangulane.

In: Angewandte Chemie, International Edition, Jg. 39 (2000) ; Nr. 14, S. 2495-2498
ISSN: 1433-7851
Zeitschriftenaufsatz / Fach: Chemie
The synthesis of highly strained branched [15]triangulane I has been achieved by a copper assisted dimerization of 1-bromo-1-lithiocyclopropanes. 7,7-Dibromodispiro[]heptane (II) underwent successive dimerization, cycloaddn., and dimerization to provide third generation bicyclopropylidene III. III proved resistant to cycloaddn. by dibromocarbenes but with less sterically demanding carbenes, e.g. dichlorocarbene, cycloaddn. occurred to give the corresponding dichlorocyclopropanes which underwent dehalogenation to produce I.