Preparation of the ‘fixed conformation esters’ 4,5-dihydrofuro- and 4,5-dihydrothieno-[2,3-c]pyran-7-one
Abstract
The title compounds, required as models in spectrometric work, have been synthesised by a six-stage route from 3-bromofuran-2-carbaldehyde diethyl acetal and the corresponding thiophen acetal.