Cyclic Phosphonium Salts by Chlorination of Benzo[c]-2-(2-Chloro-1,3-Alkadienyl)-2-Oxo-1,3,2-Dioxaphospholanes

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.

Keywords::

• 2-chloro-1,3-alkadienylphosphonic dichlorides
• catechol
• benzo[c]-2-(2-chloro-1,3 alkadienyl)-2-oxo-1,3,2-dioxaphospholanes
• chlorination
• benzo[c]-1,3,2-dioxaphospholane-2-spiro-2′-(4′,5′-dichloro-5′
• 6′-dihydro-2H-1′,2′-oxaphosphorinium) chlorides
• 4,5-dihydro-5,6,7,8,9,10-hexahydrobenz-2H-1,2-oxaphosphorine-2-spiro-2′-(benzo[c]-1′,3′,2′-dioxaphospholanium) chloride