Alpha-cyanoethylphthalate and preparation thereof

Details Alpha-cyanoethylphthalate and preparation thereof Alpha-cyanoethylphthalate and preparation thereof

1976-04-26

1977-11-01

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 318K, C07C12166

Patent

active

040565505

ABSTRACT:
This invention relates to a method for preparation of a stereo isomer mixture of crystalline alpha-cyanoethylphthalate wherein the stereo isomer mixture is separated from the reaction mixture by precipitation. More particularly, the stereo isomer mixture is initially formed by reacting lactonitrile and a phthalic acid halide in an organic liquid solution at ambient conditions and the stereo isomer mixture precipitated therefrom by adding an organic precipitant liquid to the reaction mixture. By-products and side-reaction products can be washed from the reaction mixture prior to precipitation of the stereo isomer mixture to provide an alpha-cyanoethylphthalate product having greater purity than conventionally obtained. Additionally, the present alpha-cyanoethylphthalate composition can be characterized as a mixture of the meso and dl isomers wherein one isomer has a predominant weight ratio in the mixture.

REFERENCES:
patent: 2951865 (1960-09-01), Jaffe et al.

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