| 摘要 |
Compounds of the formula <IMAGE> 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)rCl2, 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.
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