Manganese carbonyl and phase transfer catalysed, stereospecific hydroacylation of allenes to α,β-unsaturated ketones

Abstract

Phase transfer (5 mmol dm^–3 NaOH, CH₂Cl₂, cetyltrimethylammonium bromide) catalysed reaction of allenes with carbon monoxide, decacarbonyldimanganese and methyl iodide affords α,β-unsaturated ketones in a stereospecific process.