Abstract
Benzo[c]-2-(2-chloro-1,3-alkadienyl)-2-oxo-1,3,2-dioxaphospholanes 2 have been prepared by reaction of the 2-chloro-1,3-alkadienylphosphonic dichlorides 1 with catechol in the presence of triethylamine. The chlorination of 2 takes place with formation of benzo[c]-1,3,2-dioxaphospholane-2-spiro-2′-(4′,5′-dichloro-5′,6′-dihydro-2H-1′,2′-oxaphosphorinium) chlorides.
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