| 摘要 |
As reagents in the manufacture of polycarbonate resins by reaction with phosgene, use is made of fluorinated bisphenols of the formula <FORM:1017988/C3/1> in which Z is chlorine or fluorine and X and Y are hydrogen, chlorine or bromine atoms or alkyl radicals of 1-4 carbon atoms (see Division C2). An example is given of the manufacture of a polycarbonate by reacting 2,2-bis-(4-hydroxyphenyl) - 1,1,3,3 - tetrafluoro - 1,3-dichloropropane with phosgene in sodium hydroxide solution in the presence of benzyltrimethylammonium chloride.ALSO:The invention relates to bisphenols of the formula <FORM:1017988/C2/1> in which Z is chlorine or fluorine and X and Y are hydrogen, chlorine or bromine atoms or alkyl radicals of 1-4 carbon atoms. The compounds may be prepared by condensing 1,1,3,3-tetrafluoro - 1,3 - dichloracetone or 1, 1,1,3,3 - pentafluoro - 3 - chloracetone with an appropriate phenol in the presence of boron trifluoride, which may be added to the reaction mixture in the gaseous state or may be first admixed with the phenol to form a complex. The reaction is preferably effected at - 25 DEG to 100 DEG C. at atmospheric pressure, but temperatures up to 300 DEG C. and raised pressure may be applied. A solvent may be present. Examples are given of the condensation of phenol, o-cresol and o-chlorophenol with 1,1,3,3 - tetrafluoro - 1,3 - dichloracetone, and of phenol with 1,1,1,3,3-pentafluoro - 3 - chloracetone. Other specified phenols which may be treated include 2,6-dimethylphenol, 2 - bromo - and 2,6 - dibromophenol, 2,6-diisopropylphenol and 2-t.-butyl-6-methylphenol. The products are useful in the manufacture of polycarbonate resins (see Division C3).
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