Synthesis and Highly Diastereoselective Palladation of (η⁵-(<i>S</i>)-2-(4-Methylethyl)oxazolinylcyclopentadienyl)(η⁴-tetraphenylcyclobutadiene)cobalt

Abstract

Starting from sodium carbomethoxycyclopentadienide, diphenylacetylene, and chlorotris(triphenylphosphine)cobalt(I), the title compound was obtained in four steps and 47% overall yield. On reaction with Pd(OAc) 2, a single cyclopalladated diastereoisomer of ( S )-( p R ) configuration was isolated in 72% yield.