Phosphorverbindungen ungewöhnlicher Koordination, 181) Synthese eines 2,3-Diphosphabicyclo[2.l.0]pentans durch intramolekulare Phosphaalken-Dimerisierung

Phosphorus Compounds with Unusual Coordination, 181). – Synthesis of a 2,3-Diphosphabicyclo[2.l.0]pentane by Intramolecular Phosphaalkene Dimerization Dimethylmalonyl dichloride (7) reacts with lithium bis(trime-thylsily1)phosphide (THF-adduct) to yield the 2.3diphosphabicyclo[2.1.O]pentane 11; the bis(phosphaa1kene)9 is supposed to be an intermediate of the reaction sequence.