A simple, versatile preparation of highly substituted 2,5-dihydro-oxoles

Abstract
3,3-dialkyl-1-lithio-1-(phenylthio)allenes (1) add efficiently to ketones only on warming to –20 °C or above; the adducts are readily cyclised by acid, or several other electrophiles, to produce highly substituted 2,5-dihydro-oxoles.

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