Kureha Kagaku Kogyo K.k.

Yoshihisa Machida

Yutaka Konai

Kazuo Yoshida

Tadashi Nakamura

Takayuki Tanonaka

Nobuyuki Okubo

Takashi Terauchi

The present invention relates to a process for the production of halobenzophenone derivatives represented by the following formula (II): ##STR1## wherein X and Y are the same or different and are independently F, Cl, Br or I, m stands for an integer of from 1 to 4 and n stands for an integer of from 0 to 4. The process comprises oxidizing a compound with an aqueous nitric acid solution having a specific gravity of from 1.32 to 1.47 at 20.degree. C., said compound being represented by the following formula (I): ##STR2## wherein X, Y, m and n have the same meanings as defined above and Z is Cl or H.

Process for the production of halobenzophenone derivatives

4,4'-Dihydroxybiphenyl is prepared by decomposing 4,4'-di(2-hydroxy-2-propyl)biphenyl with hydrogen peroxide and an acid catalyst in acetonitrile as a solvent. Especially, this process minimizes the formation of byproducts and permits easy purification of the intended product.

Preparation process of 4,4-dihydroxybiphenyl

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Iwaki, Japan

Yoshihisa Machida