Method for making aromatic phosphorus compounds
AssigneeRohm Co., Ltd.
InventorsWerner Ude, Siegmund Besecke, Achim Riemann, Guenther Schroeder
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Abstract
Compounds of the formula ##STR1## wherein R is lower alkyl or aryl, Y is oxygen or sulfur, m is 0 or 1, Ar is arylene, and X is halogen, methyl, or aryloxy, or polymers containing repeating units of this kind are prepared from a compound R--P(Y).sub.r Cl.sub.2, where r is 0 or 1 but is never greater than m, by reaction with one or two molar parts of a compound H--ArX in the presence of a Friedel-Crafts catalyst.
Claims2
A method for making an aromatic phosphorus compound of the formula ##STR12## wherein R is methyl or phenyl, Ar is phenylene, and X is chlorine or fluorine, and at least 80 percent of said compound is present as the p,p'-isomer, which method comprises reacting one molar part of a compound R--PCl.sub.2 with at least two molar parts of a compound H--ArX in the presence of at least one molar part of elemental sulfur, and of a Friedel-Crafts catalyst.
Dependencies are inferred from the claim text.