Abstract
Dialkyl (2-chloro-1,3-alkadienyl) phosphine oxides 2 have been prepared by reaction of the 2-chloro-l,3-alkadienylphosphonic dichlorides 1 with alkylmagnesium iodides (Grignard reagents). The chlorination of 2 takes place with formation of 4,5-dichloro-5,6-dihy-dro-2H-1,2-oxaphosphorinium chlorides.
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