Preparation of dimethyl 4,4'-stilbenedicarboxylate and intermedi

Details Preparation of dimethyl 4,4'-stilbenedicarboxylate and intermedi Preparation of dimethyl 4,4'-stilbenedicarboxylate and intermedi

1986-05-15

1987-12-15

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

528308, 560 64, 560 66, 560 76, 560 96, C07C 6976, C07C 67313, C07C 6732

Patent

active

047134720

ABSTRACT:
The preparation of 4,4'-dimethylstilbenedicarboxylate by acetylating 4,4'-bis(methoxycarbonyl)benzoin to give 4,4'-bis(methoxycarbonyl)benzoin acetate, selectively reducing 4,4'-bis(methoxycarbonyl)benzoin acetate with hydrogen to give 1,2-bis(4-methoxycarbonylphenyl)ethanol, and subjecting the 1,2-bis(4-methoxycarbonylphenyl)ethanol to either (1) dehydration or (2) acetylation to 1,2-bis(4-carbomethoxyphenyl)-1-acetoxy ethane followed by pyrolysis thereof to give the 4,4'-dimethylstilbenedicarboxylate. In this process, the new compounds 4,4'-bis(methoxycarbonyl)benzoin acetate, 1,2-bis(4-methoxycarbonylphenyl)ethanol, and 1,2-bis(4-carbomethoxyphenyl)-1-acetoxy ethane are produced and the novel preparations thereof are performed.

REFERENCES:
patent: 4276430 (1981-06-01), Reller et al.
patent: 4399298 (1983-08-01), Sugimori et al.
patent: 4546197 (1985-10-01), Bateman et al.

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