Gabbutt, Christopher D., Hepworth, John D., Heron, B. Mark, Jones, Alan M., Raper, Eric S. and Clegg, William (1998) Structural studies of a novel heterocyclic phosphorane. Phosphorus, Sulfur, and Silicon and the Related Elements, 143 (1). pp. 221-230. ISSN 1042-6507

Reaction of 2,2,6-trimethylthiochroman-3,4-dione with an excess of methylenetriphenylphosphorane yields the stabilised ylide (4) by way of an α-ketol rearrangement. X-Ray crystallography indicates that (4) exists as the (a-isomer and provides supporting evidence for an enolate structure.

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