Manufacture of maleimides via cyclizing dehydration

Details Manufacture of maleimides via cyclizing dehydration Manufacture of maleimides via cyclizing dehydration

1977-01-21

1979-02-06

Berch, Mark L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603265FM, C07D20744, C07D40514, C07D40314, C07D40310

Patent

active

041384067

ABSTRACT:
The invention relates to a process for the manufacture of maleimides by cyclic dehydration of corresponding maleamic acids in the presence of acetic anhydride and a calcium, barium or strontium oxide, acetate or alcoholate (catalyst). Compared to known catalysts, especially nickel salts, these alkaline earth metal compounds used as catalysts according to the invention have the advantage that the manufacturing process gives substantially greater kettle yields, and that the compounds are non-toxic. Preferably, calcium oxide and calcium acetate are employed according to the invention. Corresponding barium compounds are also very suitable for use.

REFERENCES:
patent: 3127414 (1964-03-01), Cole
patent: 3522271 (1970-07-01), Kalil
patent: 3627780 (1971-12-01), Bonnard
patent: 3839358 (1974-10-01), Bargain
Naumov et al., Chem. Abs. 75, 87793f (1971).

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