Quinquecovalent adducts from ethylene phosphonothioites readily eliminate ethylene sulphide to give phosphoryl compounds; the low-temperature 1H n.m.r. spectrum of the adduct of dimethyl t-butylphosphonite with methylenedeoxybenzoin shows that the t-butyl group preferentially occupies an equatorial position.
A. P. Stewart and S. Trippett, J. Chem. Soc. D, 1970, 1279 DOI: 10.1039/C29700001279
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