1‐Phospha‐1,2,3‐butatriene

Abstract

The first phosphacumulenes of type 1 have been synthesized from dichloro(2,4,6‐tri‐ tert ‐butylphenyl)phosphane and lithioallenes. According to an X‐ray structure analysis, the unit in 1a , R′ = R″ = Ph, is linear. In the case of 1b , with Me and SiMe 3 as substituents (R′, R″), the expected E/Z isomer could be isolated. equation image