Preparation of .DELTA.-2 tetrahydropyrimidines

Details Preparation of .DELTA.-2 tetrahydropyrimidines Preparation of .DELTA.-2 tetrahydropyrimidines

1977-06-01

1979-03-27

Rizzo, Nicholas S.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544333, C07D23902

Patent

active

041467140

ABSTRACT:
A process of converting 2,3,4,5-tetrahydropyrimidines (.DELTA.-1) having at least one hydrogen in the 2-position to 3,4,5,6-tetrahydropyrimidines (.DELTA.-2), which comprises hydrogenating and dehydrogenating said .DELTA.-1 tetrahydropyrimidines. Such hydrogenating and dehydrogenating may be done in either two sequential steps or in one step.
Said .DELTA.-1 tetrahydropyrimidines can also be converted to .DELTA.-2 tetrahydropyrimidines by heating in the essential absence of a solvent, and preferably under basic conditions.
In addition, corresponding hexahydropyrimidines can be converted to corresponding .DELTA.-2 tetrahydropyrimidines by dehydrogenation.
This invention also relates to the use of .DELTA.-2 tetrahydropyrimidines, particularly as corrosion inhibitors.

REFERENCES:
patent: 3904625 (1975-09-01), Alink
patent: 3943134 (1976-03-01), Kajiyama et al.
patent: 4001232 (1977-01-01), Groegler et al.

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