A P<sub>2</sub>C<sub>2</sub> Four‐Membered Ring with Unusual Bonding—Synthesis, Structure, and Ring Opening of a 1,3‐Diphosphacyclobutane‐2,4‐diyl

Abstract

An open form of a 2,4-diphosphabicyclobutane is one way to describe the unprecedented structure of the P2C2 heterocycle 1 (Ar = 2,4,6-tBu3C6H2). Ab initio calculations on 1 show that a partially delocalized π system exists with a considerable diradical contribution. Dark red 1 is accessible from ArP  CCl2 and nBuLi.

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