Monomethylation of nitrogeneous heterocycles

Details Monomethylation of nitrogeneous heterocycles Monomethylation of nitrogeneous heterocycles

2006-04-04

2006-04-04

Wilson, James O. (Department: 1624)

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

C544S178000, C544S404000, C548S335100, C548S373100

Reexamination Certificate

active

07022845

ABSTRACT:
A process for the monomethylation of nitrogenous heterocycles having at least one nitrogen atom bonded to a hydrogen atom by reacting the nitrogenous heterocycle with dimethyl carbonate at a temperature of between 100° and 200° C. and a pressure of between 0.93×105Pa and 1.07×105Pa while methanol produced during the reaction is distilled off as it is formed.

REFERENCES:
patent: 5164497 (1992-11-01), King et al.
patent: 5453516 (1995-09-01), Fischer et al.
patent: 09169737 (1997-06-01), None
patent: 9608537 (1996-03-01), None
Smith and Linnhoff, “The Design of Separators in the Context of Overall Processes” Chemical Engineering Research and Design, vol. 66, pp. 195-228 (May 1988).
Lissel, “N-Methylierung . . . Derivaten”, Liebigs Annalen Der Chemie, Verlag Chemie GmbH, Weinheim, 1987, pp. 77-79.

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