GRAPHICAL ABSTRACT
![](/cms/asset/aac4d633-ad57-4e64-84d3-eb6ba161cea1/gpss_a_974097_uf0001_b.gif)
Abstract
A new two-step method for obtaining of phosphonium salts from phosphine oxides was developed. The method includes a cyclization of the dialkyl-2-(2-hydroxy-5-chlorophenyl)-2-phenylethenylphosphine oxides caused by sulfinyl chloride followed by the ring opening under the action of Grignard reagent.