Syntheses and molecular structures of molybdenum complexes containing an η3-butadienyl ligand and its hydromethoxylated derivative

Abstract

Reaction of Ph₄P[Mo(bipy)Cl(CO)₃](bipy = bipyridine) with ClCH₂CCCH₂Cl in wet methanol yields [Mo(bipy)Cl(CO)₂{η³-CH₂–C–(CO₂Me)–CCH₂}](1), which contains an η³-bonded trans-butadienyl ligand; under anhydrous conditions in methanol–tetrahydrofuran [Mo(bipy)Cl(CO)₂{η³-CH₂–C(CO₂Me)–C(Me)(OMe)}](2) is formed: the η³-allyl ligand in (2) can be formally derived by addition of MeOH across the non-co-ordinated CCH₂ entity in (1), so yielding –Me and –OMe substituents in syn- and anti-conformations respectively.