.DELTA.-2 Tetrahydropyrimidines as corrosion inhibitors

Details .DELTA.-2 Tetrahydropyrimidines as corrosion inhibitors .DELTA.-2 Tetrahydropyrimidines as corrosion inhibitors

1978-09-15

1980-07-15

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Maintaining environment nondestructive to metal

252390, 252391, 422 12, C23F 1104, C23F 1112, C23F 1114

Patent

active

042128439

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 hexahydropyrimidimidines 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.

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patent: 3943134 (1976-03-01), Kajiyama et al.
patent: 4001232 (1977-01-01), Groegler et al.

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