One-step synthesis of alkenyloxy–alkenylcarbene complexes and the unprecedented formation of an η5-allyl-alkene ruthenium complex

Abstract

Tetramethylbenzene alkenyloxy-alkenylcarbene ruthenium(II) derivatives [(C₆Me₄H₂)Ru{C[O(CH₂)_mCHCH₂]CHCH–(CHCH)_n-R}Cl(PMe₃)]PF₆(m= 1,2; n = 0, 1, 2)are produced in a one-step reaction from (C₆Me₄H₂)RuCl₂(PMe₃) in the presence of propynylic alcohol derivatives HCC–C(H)(OH)[(CHCH)n-R] and ethylenic alcohols, whereas a similar reaction with HCC–C(OH)Me₂ affords a novel η⁵-allyl–alkene ruthenium complex, which is characterised by X-ray crystal structural analysis.