Abstract: The compound 1,1-dichloro-2,2-bis-(4-hydroxyphenyl)ethylene can be prepared by the reaction of 1,1-dichloro-2,2-diphenoxy ethylene and phenol in the presence of triflic acid. The formed dihydroxydiphenyl chloroethylene can be treated with a phosgenating agent to form polycarbonate resins which can be used in applications where flame retardancy is desired.

Abstract: Diphenyl chloroethylenes are prepared by the reaction of either phenol or anisole with a trihaloethylene compound.

Abstract: The compound 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane can be prepared by effecting reaction between phenol and chloral in a solvent medium comprising aqueous sulfuric acid of a concentration of from 75 to 88%.

Abstract: An improvement in a process for the preparation of dichlorophene by reacting p-chlorophenol with formaldehyde in the presence of sulfuric acid. The improvement lies in contacting p-chlorophenol with the stoichiometric excess of formaldehyde in aqueous sulfuric acid by introducing into a sulfuric acid reaction medium 1 to 6% by weight of the total amount of p-chlorophenol to be reacted and thereafter adding the formaldehyde and additional p-chlorophenol to the reaction mixture in an amount such that at the end of the addition of the p-chlorophenol only 85 to 98% by weight of the total amount of formaldehyde has been added. The balance of the formaldehyde is then introduced into the reaction mixture.

Abstract: A method is described for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane employing a refluxing dipolar aprotic solvent, such as dimethylformamide, containing a lithium halide catalyst to produce a crystalline product consisting essentially of 1,1-dichloro-2,2-bis(4-hydroxyphenyl) ethylene. The crystalline product can be isolated in substantially pure form and converted to a high impact, flame retardant polycarbonate.

Abstract: Tetrabromo bisphenol A is prepared from bisphenol A by reacting it with less than four moles of bromine in organic solvent, with or without water, and with simultaneous or subsequent treatment with alkali metal chlorate.

Abstract: The compound 1,1-dichloro-2,2-bis-(4-hydroxyphenyl) ethylene can be prepared by the reaction of 1,1-dichloro-2,2-diphenoxy ethylene and phenol in the presence of BF.sub.3 gas and methylene chloride. The formed dihydroxydiphenyl chloroethylene can be treated with a phosgenating agent to form polycarbonate resins which can be used in applications where flame retardancy is desired.

Abstract: Diphenyl trichloro-ethanes can be prepared by effecting reaction between a phenol or anisole (methoxybenzene) with chloral in a solvent medium comprising sulfuric acid and a liquid aliphatic chlorohydrocarbon containing from 1 to 2 carbon atoms.

Abstract: Dichloroketene-ketals can be made by the reaction of tetrachloroethylene with an alkali-metal phenate. The latter compounds can be converted to corresponding dihydroxy derivatives which can be phosgenated to make polycarbonate resins useful in the molding and coating arts.

Abstract: 1,1,1-Trichloro-2,2-bis(4-hydroxyphenyl)ethane can be dehydrohalogenated to 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene by treating the former with liquid ammonia.