Phospolanes and diphospholanes of the general formula I ##STR1## where: is H, C.sub.1 -C.sub.6 -aryl, alkylaryl, SiR.sub.3.sup.2, R.sup.2 is alkyl or aryl, A is H, C.sub.1 -C.sub.6 -alkyl, aryl, Cl or ##STR2## B is a linker with 1-5 C atoms between the two P atoms, and their use as catalyst in asymmetric synthesis.

Phospolanes e diphospholanes do ## geral do ## STR1 da fórmula I onde: é H, C.sub.1 - C.sub.6 - arilo, alkylaryl, SiR.sub.3.sup.2, R.sup.2 é alkyl ou aryl, A é H, C.sub.1 - C.sub.6 - alkyl, arilo, o ## B do cl ou do ## STR2 é um linker com os 1-5 átomos de C entre os dois átomos de P, e seu uso como o catalizador na síntese asymmetric.

 
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