Phosphorodichloridates dichlorides

Similar reactions with haloalkenes lead to simultaneous halogenation at the C=C bond. Vinyl chloride reacts at -40 to -20 °C to give a 70% combined yield of (1,2-dichloroethyl)-and (2,2-dichloroethyl)-phosphonic dichlorides, which can be separated in an indirect fashion which results in the loss of the latter ". The reaction has also been applied to vinyl fluoride and vinyl bromide Prop-2-enyl chloride gives a good yield of (2,3-dichloro-propyl)phosphonic dichloride " and 1,2-dichloroethene yields (1,2,2-trichloroethyl)phos-phonic dichloride. Other halogenated alkenes, H2C=CHR, where R is CCI3 or C F2 +i (n = 4,6, 8 or 10), yield only the phosphorodichloridates RCH(CH2Cl)0P(0)Cl2. ... 

Ethyl phosphorodichloridate Ethylphosphoric acid dichloride CgHgCIgOgP 1498-51-7 162.940 62 " 1.4338 " ... 

Phosphorylation. Phosphorus oxychloride reacts with alcohols, amines, and thiols, resulting in phosphorylation of these functional groups. Trimethyl phosphate is a particularly effective solvent, and tertiary amine bases are generally used as well. Treatment of primary alcohols with POCI3 results in the formation of phosphonyl dichloride intermediates which, in the presence of excess alcohol, convert to symmetrical trialkyl phosphates. It is generally possible to isolate aryl phosphorodichloridates when a two-fold excess of (1) is used and AICI3, KCl, or pyridine is used as a catalyst. Secondary and tertiary alcohols tend to form alkyl chlorides and phosphoric acid. 

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