A method for preparing-3,3-diaminobenzidine, the method comprising the following steps: subjecting 4,4-biphenol and N,N-dimethylsulfamoyl chloride to an esterification reaction in a specified solvent at 40-70? C. to obtain 4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a first intermediate; subjecting the 4,4-biphenyl bis(N,N-dimethylaminosulfonate) to a chlorination reaction with a chlorinating reagent under acidic conditions to obtain 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a second intermediate; subjecting the second intermediate 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) to an ammonolysis reaction with anammoniation reagent in the presence of a combined catalyst to obtain a crude product of 3,3,4,4-tetraaminobiphenyl, wherein the combined catalyst is a mixture of proline, a cuprous salt and a phase transfer catalyst; and subjecting the crude product of 3,3,4,4-tetraaminobiphenyl to a post-treatment to obtain a purified 3,3,4,4-tetraaminobiphenyl product. In the present invention, 4,4-biphenol is used as a raw material, a brand-new synthesis route is used, the product purity is high, and pollution of three kinds of waste is reduced.

A method for preparing-3,3-diaminobenzidine, the method comprising the following steps: subjecting 4,4-biphenol and N,N-dimethylsulfamoyl chloride to an esterification reaction in a specified solvent at 40-70? C. to obtain 4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a first intermediate; subjecting the 4,4-biphenyl bis(N,N-dimethylaminosulfonate) to a chlorination reaction with a chlorinating reagent under acidic conditions to obtain 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a second intermediate; subjecting the second intermediate 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) to an ammonolysis reaction with anammoniation reagent in the presence of a combined catalyst to obtain a crude product of 3,3,4,4-tetraaminobiphenyl, wherein the combined catalyst is a mixture of proline, a cuprous salt and a phase transfer catalyst; and subjecting the crude product of 3,3,4,4-tetraaminobiphenyl to a post-treatment to obtain a purified 3,3,4,4-tetraaminobiphenyl product. In the present invention, 4,4-biphenol is used as a raw material, a brand-new synthesis route is used, the product purity is high, and pollution of three kinds of waste is reduced.

The present invention relates to a novel method for preparing (S)N.sup.1-(2-aminoethyl)-3-(4-alkoxyphenyl)propane-1,2-diamine trihydrochloride.

The present invention relates to a novel method for preparing (S)N.sup.1-(2-aminoethyl)-3-(4-alkoxyphenyl)propane-1,2-diamine trihydrochloride.

A method for preparing 3,3-diaminobenzidine, the method comprising the following steps: subjecting 4,4-biphenol and N,N-dimethylsulfamoyl chloride to an esterification reaction in a specified solvent at 40-70? C. to obtain 4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a first intermediate; subjecting the 4,4-biphenyl bis(N,N-dimethylaminosulfonate) to a chlorination reaction with a chlorinating reagent under acidic conditions to obtain 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a second intermediate; subjecting the second intermediate 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) to an ammonolysis reaction with anammoniation reagent in the presence of a combined catalyst to obtain a crude product of 3,3,4,4-tetraaminobiphenyl, wherein the combined catalyst is a mixture of proline, a cuprous salt and a phase transfer catalyst; and subjecting the crude product of 3,3,4,4-tetraaminobiphenyl to a post-treatment to obtain a purified 3,3,4,4-tetraaminobiphenyl product. In the present invention, 4,4-biphenol is used as a raw material, a brand-new synthesis route is used, the product purity is high, and pollution of three kinds of waste is reduced.

A method for preparing 3,3-diaminobenzidine, the method comprising the following steps: subjecting 4,4-biphenol and N,N-dimethylsulfamoyl chloride to an esterification reaction in a specified solvent at 40-70? C. to obtain 4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a first intermediate; subjecting the 4,4-biphenyl bis(N,N-dimethylaminosulfonate) to a chlorination reaction with a chlorinating reagent under acidic conditions to obtain 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) as a second intermediate; subjecting the second intermediate 3,3-dichloro-4,4-biphenyl bis(N,N-dimethylaminosulfonate) to an ammonolysis reaction with anammoniation reagent in the presence of a combined catalyst to obtain a crude product of 3,3,4,4-tetraaminobiphenyl, wherein the combined catalyst is a mixture of proline, a cuprous salt and a phase transfer catalyst; and subjecting the crude product of 3,3,4,4-tetraaminobiphenyl to a post-treatment to obtain a purified 3,3,4,4-tetraaminobiphenyl product. In the present invention, 4,4-biphenol is used as a raw material, a brand-new synthesis route is used, the product purity is high, and pollution of three kinds of waste is reduced.

The invention provides branched trialkylamine oxides with improved properties. The trialkylamine oxides of the invention produced from branched trialkylamines, in one embodiment, can be made using certain branched C10-12 enals and aldehydes. The invention also provides an trialkylamine oxide having the formula:

##STR00001##

wherein R5, R6 and R7 are independently at least one of C3H7, C2H5, CH3, or H, or mixtures thereof; and wherein R5 and R6 are not H at the same time. In one embodiment, the trialkylamine oxides of the invention can be useful in making various products, for example, as surfactants.

The invention provides branched hydrophobes for the production of surfactants with improved properties over linear hydrophobes. The invention also provides branched C10-12 enals and aldehydes that are oxidized to branched fatty acids or hydrogenated to branched fatty alcohols and further derivatized to surfactants, through ethoxylation or esterification and other or subsequent reactions. The invention further provides surfactants made from the branched trialkylamine intermediates, including amphoteric, cationic and nonionic surfactants.

The invention provides branched hydrophobes for the production of surfactants with improved properties over linear hydrophobes. The invention also provides branched C.sub.10-12 enals and aldehydes. The invention additionally provides branched C.sub.10-12 enals and aldehydes that are oxidized to branched fatty acids or hydrogenated to branched fatty alcohols and further derivatized to surfactants, through ethoxylation or esterification and other or subsequent reactions. The enals and aldehydes are useful in making branched trialkylamine intermediates useful in making certain surfactants, including amphoteric, cationic and nonionic surfactants. The surfactants which can be produced from the trialkylamine intermediates include the quaternary ammonium compounds of the invention. The quaternary ammonium compounds of the invention are also useful in making the branched enals and/or aldehydes useful in the invention.

The invention provides branched hydrophobes for the production of surfactants with improved properties over linear hydrophobes. The invention also provides branched C.sub.10-12 enals and aldehydes. The invention additionally provides branched C.sub.10-12 enals and aldehydes that are oxidized to branched fatty acids or hydrogenated to branched fatty alcohols and further derivatized to surfactants, through ethoxylation or esterification and other or subsequent reactions. The enals and aldehydes are useful in making branched trialkylamine intermediates useful in making certain surfactants, including amphoteric, cationic and nonionic surfactants. The surfactants which can be produced from the trialkylamine intermediates include the quaternary ammonium compounds of the invention. The quaternary ammonium compounds of the invention are also useful in making the branched enals and/or aldehydes useful in the invention.