Process for making N-(N'-methylenepyrrolidonyl)-2-substituted an

Details Process for making N-(N'-methylenepyrrolidonyl)-2-substituted an Process for making N-(N'-methylenepyrrolidonyl)-2-substituted an

1978-11-20

1980-05-20

Tovar, Jose

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603265FL, C07D20744

Patent

active

042039010

ABSTRACT:
This invention relates to a process for making N-(N'-methylenepyrrolidonyl)-2-substituted anilines in high yield. The products are useful intermediates in the synthesis of herbicides.
The process comprises reacting substantially equivalent molar concentrations of a 2-substituted aniline, as defined herein, with N-methylolpyrrolidone in an aromatic hydrocarbon solvent in the absence of an acid or base catalyst at a reflux temperature of 80.degree.-140.degree. C. while simultaneously and continuously distilling out from the reaction mixture an azeotrope consisting essentially of water and solvent until substantially all the water produced during the reaction has been removed thereby, and, thereafter, crystallizing the product from the remaining solution.

REFERENCES:
patent: 3136766 (1964-06-01), Buc et al.
patent: 3950393 (1976-04-01), Keck et al.

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