2,2,2-Trichloro-4-methoxy-1,3,2-benzodioxaphosphole in the reactions with terminal acetylenes

摘要

2,2,2-Trichloro-4-methoxy-1,3,2-benzodioxaphosphole reacts with arylacetylenes or 3-chloropropyne to give 2,7-di-chloro-5-methoxy-4-aryl(haloalkyl)-1,2-benzoxaphosphinine 2-oxides. Hydrolysis of the latter leads to the opening of the oxaphosphinine ring and formation of (E)-2-(4-chloro-2methoxy-6-hydroxyphenyl)ethenylphosphonic acid.