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Abstract
The salts obtained from phosphine oxides and trifluoromethanesulphonic anhydride give quinquevalent cyclic phosphoranes on treatment with 1,2-diols or catechols in the presence of di-isopropylamine. The method is not successful starting with cyclic phosphonic or phosphinic esters. Spirophosphoranes are obtained from phosphetan sulphides on alkylation with [Me3O][PF6] followed by treatment with pyrocatechol, but not with perfluoropinacol, in the presence of di-isopropylamine. The spirophosphorane (25), from 2-phenyl-1,2-oxaphospholan and hexafluoroacetone, is described.
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Schedule a callMore From: Journal of the Chemical Society, Perkin Transactions 1
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