- Substituted tetrahydropyrimidines and octahydrophenanthridines
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This invention relates to certain substituted tetrahydropyrimidines and derivatives thereof, including the preparation and uses thereof.
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- Hydroxy and hydroperoxy tetrahydropyrimidines
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This invention relates to 5-hydroperoxy and/or 5-hydroxy derivatives of 2,2,4,4-dipentamethylene 5,6-tetramethylene 2,3,4,5-tetrahydropyrimidines; and to the preparation thereof. The compounds of this invention have utility as corrosion inhibitors.
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- Process of preparing hexahydropyrimidines
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This invention relates to hexahydropyrimidines (HHP) of the formula STR1 where R' is a substituted group and R is hydrogen or a substituted group; the process of preparing and the uses therefor, particularly as deterioration inhibitors in hydrocarbon fuels.
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- Preparation of perhydrophenanthridines
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This invention relates to the reduction of THP to perhydrophenanthridines (PHA) with formic acid. This is illustrated by the following equation STR1 where R is hydrogen or a substituted group, such as hydrocarbon, for example alkyl, etc.; and X and Y are hydrogen or a substituted group, such as a hydrocarbon group containing a functional group, for example alkyl-X where X is a functional group such as nitrilo, carboxyl, etc. The perhydrophenanthridines of this invention are useful as corrosion inhibitors and as fuel stability additives.
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- Hexahydropyrimidines as anti-oxidants in natural and synthetic rubbers
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This invention relates to the use of hexahydropyrimidines (HHP) as anti-oxidants for elastic materials such as rubber. The preferred hexahydropyrimidines contain at least one cycloalkylene or substituted cycloalkylene group and most preferably three cycloalkylene groups as illustrated by 2,2,4,4-dipentamethylene-5,6-tetramethylene hexahydropyrimidine.
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- Hexahydropyrimidines
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This invention relates to hexahydropyrimidines (HHP) and to the preparation of HHP by the reduction of tetrahydropyrimidines (THP). HHP is preferably prepared by reacting carbonyls, such as ketones and aldehydes, with ammonia in the presence of ammonium formate to form THP and then reducing THP to HHP. The preferred carbonyl is a cycloalkylene ketone such as cyclohexyl ketone or substituted cyclohexyl ketone.
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- Preparation of octahydrophenanthridines
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This invention relates to the preparation of octahydrophenanthridines by the deammoniation of tetrahydropyrimidines; and to the products thereof.
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- Amino compounds and use thereof as antioxidants
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This invention relates to diamines prepared by condensing cyclohexanone, or derivatives thereof, with ammonia to yield tetrahydropyrimidines, which can be reduced to hexahydropyrimidines, whose pyrimidine ring can be broken to yield diamines having one primary amino group, which primary group can be reacted with a carbonyl to yield Schiff base imines, which Schiff base imines can be reduced to N-substituted amino groups. The two amino groups of the reduced Schiff base can be bridged by reaction with an aldehyde to form N,N'-disubstituted pyrimidines. This invention also relates to the use of these products as antioxidants.
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