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Abstract Organo-phosphorus Compounds ~he science of syn~hetic o .. ·gano ... phosphorus compounds started by ~sseigne 1 •2 when he prepared d crude mixture of alkyl phosphate by heating alcohols with syrupy phosphoric acid. In (1840) Tenard and others), studied the phosphine derivatives end since that time the chemistr1 of organophosphorus compounds have been developed rapidly. The development end growth of organo-phosphorus chemistry ere greatly contributed to Michaelis end his co-workers during the letter half of the nineteenth century. They synthesized a variety of organo-phosphorus compounds particularly those with ”carbon-phosphorus” bond. This work is continued end extended by Arbusow specially in the field of phosphorus acid triesters end their transformation to dialkyl phosphates thromgh the so called Arbusov reaction2• The reaction of phosphorus trihalide with alcohols to produce alkyl halides has been known for many yeers4-l5, but study of the phosphorus containing side products has been limited to the phosphites16• One of the first reported reactions of phosphorus trihalide with alcohols was by Menschutken4• A side product of this reaction was the alkyl halide. It was supposed that |