Abstract: An improved process for obtaining halogenated diphenols which can be pure dihalodiphenols or predetermined, statistical mixtures comprising unreacted diphenol, monohalodiphenols and dihalodiphenols.

Abstract: 2,2-di(4-hydroxyphenyl) propane, i.e., diphenylolpropane, is purified by preparing a liquid mixture of raw diphenylolpropane, phenol and water and applying reduced pressure thereto corresponding to the vapor pressure of the mixture while simultaneously cooling same whereby an adduct of pure diphenylolpropane and phenol is crystallized.

Abstract: Benzopinacol compounds can be prepared by an improved process comprising irradiating a diarylketone with UV radiation in a non-polar hydrocarbon solvent mixed with an alcohol. The volume ratio of the non-polar hydrocarbon solvent to alcohol is between 3:1 and 8:1. The benzopinacols are useful, for example, in imaging materials, such as with certain dyes that are reactive with the ketyl radicals that can be released from the benzopinacols upon heating.

Abstract: Benzopinacols represented by the formula: ##STR1## wherein R.sup.1 is hydrogen, alkyl or aryl;R.sup.2 and R.sup.6 independently are selected from the group consisting of hydrogen, halogen or trifluoromethyl;R.sup.3 and R.sup.5 independently, are selected from the group consisting of hydrogen, halogen and alkyl or, when taken together with R.sup.4, represent a tetramethylene group; andR.sup.4 is selected from the group consisting of hydrogen, halogen, alkyl, alkoxy and phenoxy;With the proviso that when both of the ortho positions of the phenyl groups to which R.sup.2 and R.sup.6 are attached are substituted, the substituent is fluorine. These benzopinacol compounds can be prepared by an improved process comprising irradiating a diarylketone with UV radiation in a non-polar hydrocarbon solvent mixed with an alcohol. The volume ratio of the non-polar hydrocarbon solvent to alcohol is between 3:1 and 8:1.

Abstract: A process for the preparation of multinuclear phenols alkylated in the nucleus, wherein bisphenol A is reacted with a phenyl alkenyl compound in the presence of a catalytic quantity of aluminium phenolate and resols obtained from said alkylated phenols.