Abstract: A process for preparing a diester of carbonic acid which comprises bringing carbon monoxide into contact with an ester of nitrous acid in a vapor phase at a pressure greater than atmospheric pressure in the presence of a solid catalyst having (a) a platinum group metal or a compound thereof and (b) at least one metal compound of a metal selected from the group consisting of iron, copper, bismuth, cobalt, nickel and tin; carried on a carrier.

Abstract: A method of purifying 2-methyl-4-amino-5-aminomethylpyrimidine by heating the carbonate thereof. Preferably the heating is carried out in water or a specified solvent.

Abstract: There are disclosed a process for producing a 2-hydroxy-methylene-3,3dialkoxypropanenitrile alkali metal salt (ALVM.sub.2) represented by the formula (I): ##STR1## wherein R represents a lower alkyl group having 1 to 4 carbon atoms and M represents an alkali metal,which comprises allowing a 3,3-dialkoxypropanenitrile represented by the formula (II):(RO).sub.2 CHCH.sub.2 CN (II)wherein R is the same as defined above,to react with carbon monoxide in a lower alcoholic solution of an alkali metal lower alkoxide; and a process for obtaining ALVM.sub.2 -alcohlic slurry, which comprises adding a lower alcohol having 1 to 4 carbon atoms to a synthetic reaction mixture containing ALVM.sub.2 represented by the above formula (I) and methyl formate and heating the mixture to 30.degree. to 70.degree. C., thereby taking methyl formate out of the system.

Abstract: Disclosed are a 2-methyl-4-amino-5-aminomethylpyrimidine carbonate which is a novel compound, a process for preparing the same which comprises subjecting 2-methyl-4-amino-5-aminomethylpyrimidine to reaction with carbon dioxide in a lower aliphatic alcohol, and a simple method of purification of 2-methyl-4-amino-5-aminomethylpyrimidine by using the carbonate thereof.

Abstract: There is disclosed a process for the preparation of a 2-alkyl-4-amino-5-aminomethylpyrimidine, which comprises subjecting a 2-alkyl-4-amino-5-formylpyrimidine to catalytic reaction with hydrogen and ammonia in the presence of a reduction catalyst.According to the process of this invention, the desired product can be obtained in much higher yield as compared with the processes known to the art.

Abstract: A process for preparing a 4-amino-5-dialkoxymethylpyrimidine derivative of the formula: ##STR1## which comprises reacting a propanenitrile derivative represented by the formula (I) or the novel compound represented by formula (II): ##STR2## with an amidine of the formula: ##STR3## wherein R.sup.1 to R.sup.6 are as defined in the specification. Also disclosed is a process for making the novel compounds of formula (II).

Abstract: There is provided a process for the continuous preparation of a diester of oxalic acid, which comprises a first step of reacting carbon monoxide with an ester of nitrous acid in the gaseous phase; a second step of condensing the gaseous reaction mixture to separate a non-condensed gas from a condensed liquid containing the diester of oxalic acid; a third step of introducing the non-condensed gas of the second step to a regeneration column, thereby contacting it with a gas containing molecular oxygen and an alcohol, and recycling the resulting gas containing an ester of nitrous acid to the reactor of the first step; a fourth step of distilling out an alcohol containing a diester of carbonic acid formed as a by-product of the first step and obtaining a liquid diester of oxalic acid; and a fifth step of introducing the distillate of the fourth step to a hydrolysis column thereby hydrolyzing the diester of carbonic acid in the gas and recycling the alcohol as an alcohol source for the third step.

Abstract: There is provided a process for the continuous preparation of a diester of oxalic acid which comprises a first step of reacting carbon monoxide with an ester of nitrous acid in the gaseous phase; a second step of condensing the gaseous reaction mixture to separate a non-condensed gas from a condensed liquid containing the diester of oxalic acid; a third step of introducing the non-condensed gas of the second step to a regeneration column and thereby contacting it with a gas containing molecular oxygen and an alcohol to regenerate nitrogen monoxide in the non-condensed gas into an ester of nitrous acid so as to bring the concentration of nitrogen monoxide in the gas at the outlet of the column to a level of from 2 to 7% by volume; and a fourth step of recycling the gas of the third step containing the ester of nitrous acid and from 2 to 7% by volume of nitrogen monoxide to the reactor of the first step.

Abstract: There are disclosed a 4-alkoxy-1,3-dioxane-5-carbonitrile which is a novel compound represented by the formula ##STR1## wherein R represents a lower-alkyl group, and which is useful as an intermediate for the synthesis of Vitamin B.sub.1, and a process for preparing the novel compound by subjecting a 3-alkoxy-2-propenenitrile to reaction with a formaldehyde in the presence of an acid catalyst.

Abstract: A process for preparing an N-alkylene-diamine by contacting an alkylene diamine with an aliphatic aldehyde in a reaction solvent in the presence of hydrogen under pressure and an platinum group metal, which comprises gradually adding the aliphatic aldehyde to the alkylene diamine. The process according to the present invention provides a high conversion of the alkylene diamine and a high selectivity to the N-alkyl-alkylene-diamine.

Abstract: A process for preparing a diester of a dicarboxylic acid having two more carbon atoms than the unsaturated hydrocarbon used as a starting material, which comprises subjecting an unsaturated hydrocarbon, carbon monoxide and an ester of nitrous acid to catalytic vapor phase reaction at a temperature of 50.degree. to 200.degree. C. in the presence of a platinum group metal or a salt thereof and a halogen compound.

Abstract: A process for preparing a diester of malonic acid which comprises reacting ketene and carbon monoxide with an ester of nitrous acid catalytically in the presence of metallic palladium or a salt thereof.

Abstract: A process for preparing a diester of oxalic acid which comprises bringing carbon monoxide into contact with an ester of nitrous acid or with an alcohol and a nitrogen oxide or a hydrate of the nitrogen oxide in the gaseous phase in the presence of a solid catalyst containing metallic palladium or a salt thereof, a gas containing molecular oxygen being introduced into the reaction system in cases where said nitrogen oxide or a hydrate of the nitrogen oxide requires molecular oxygen together with the alcohol to form an ester of nitrous acid.

Abstract: A process for preparing a diester of oxalic acid which comprises bringing carbon monoxide into contact with an ester of nitrous acid in the liquid phase, in the presence of metallic palladium or a salt thereof, preferably with introduction of a gas containing molecular oxygen into the reaction system, more preferably with further incorporation of an alcohol in the reaction system.

Abstract: A process for the preparation of dialkyl oxalates by reacting an aliphatic alcohol with carbon monoxide under pressure, which comprises carrying out the reaction in the presence of(a) a catalyst comprising a platinum group metal or a salt thereof, and(b) an accelerator composed of one or more compounds selected from the group consisting of nitric acid and nitrogen oxides.

Abstract: A process for preparing a diester of oxalic acid which comprises bringing carbon monoxide into contact with an ester of nitrous acid or with an alcohol and a nitrogen oxide or a hydrate of the nitrogen oxide in the gaseous phase in the presence of a solid catalyst containing metallic palladium or a salt thereof, a gas containing molecular oxygen being introduced into the reaction system in cases where said nitrogen oxide or a hydrate of the nitrogen oxide requires molecular oxygen together with the alcohol to form an ester of nitrous acid.