Abstract
An efficient procedure has been proposed for the synthesis of quasiphosphonium salts, 2,2-dialkyl-6-chloro-4-phenyl-2H-1,2-benzoxaphosphinin-2-onium chlorides, via cyclization of dialkyl[2-(5-chloro-2-hydroxyphenyl)-2-phenylethenyl]phosphine oxides under the action of thionyl chloride.
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