Abstract: Disclosed are a novel process for preparing D-alloisoleucine and an improved process for epimerizing L-isoleucine to prepare D-alloisoleucine. In the former process, (2S, 3S)-tartaric acid derivative of formula I below; wherein R stands for a hydrogen atom, a C1-C3 lower alkyl group, lower alkoxy group, chlorine atom, bromine atom and nitro group; and “n” is a number of 0, 1 and 2; is combined with an epimer mixture of L-isoleucine and D-alloisoleucine in a reaction medium to form a complex of D-alloisoleucine and the compound of formula I. The precipitated complex is decomposed by putting it in an alcohol to isolate D-alloisoleucine. In the latter process, L-isoleucine is suspended in an inert solvent which does not substantially dissolve amino acids, and epimerized in the presence of C1-C5 saturated lower fatty acid and salicylaldehyde.

Abstract: Process for preparing optically active 2-piperazine-carboxylic acid derivatives, particularly S-enantiomer thereof, in high yield and high optical purity on industrial scale. As the optical resolving agents, easily accessible sulfonamides derived from selected optically active amino acids, such as N-tosyl-L-phenylalanine, N-tosyl-D-phenylglycine, N-tosyl-L-alanine or N-tosyl-L-valine, give excellent results. These resolving agents are stable and easily recovered from the reaction mixture and reused. Resolved 2-piperazinecarboxylic acid derivatives are preferably isolated as 4-t-butoxycarbonyl (Boc) derivatives. Diastereomeric salts (an example being shown below) formed as the intermediates of resolution are novel. ##STR1## ?In the formula "Ar" stands for a phenyl or naphthyl group which may be substituted with one to three C1-C6 alkyl groups, halogen atoms, nitro or alkoxy groups; and n=0 or 1.

Abstract: Heat sensitive recording sheet having improved light resistance and water resistance. A developer contained therein is one or more specified metal salts of 2,2'-bisphenolsulfide, 2,2'-bisphenolsulfoxide and 2,2'-bisphenolsulfone compounds. The heat sensitive recording sheet can further contain a heat fusible material having a melting point of 50.degree. to 190.degree. C.

Abstract: Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under acidic conditions with formaldehyde or a substance capable of generating formaldehyde.

Abstract: Disclosed is a process for the preparation of 2,2'-bis(4-substituted phenol)sulfides which comprises reacting a 4-substituted phenol with sulfur dichloride in a hydrocarbon solvent at a temperature of from -10.degree. to 40.degree. C. in the presence of a Lewis acid catalyst. For example, 2,2'-bis(4-cumylphenol)-sulfide, i.e. 2,2'-bis(4-.alpha.,.alpha.-dimethyl benzyl-phenol)monosulfide, which is a novel compound can be prepared by reacting 4-cumylphenol with sulfur dichloride in benzene at a temperature of from 0.degree.to 10.degree. C. in the presence of zinc chloride.

Abstract: Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under alkaline conditions with formaldehyde or a substance capable of generating formaldehyde.

Abstract: An oxidation-reducing reagent for a wet desulfurization process, which comprises (a) one or more compounds selected from the group consisting of salts of substituted anthraquinonesulfonic acids of the general formulas: ##STR1## wherein M stands for a sodium atom, a potassium atom or an ammonium group, and n is an integer of 1 or 2, or (b) a mixture of a salt of anthraquinone-2,7-disulfonic acid and one or more compounds shown by the general formula (I) and/or (II), as well as a process for preparing the compounds of the general formulas (I) and (II).

Abstract: A process for producing an alpha-halogeno-beta-aminopropionitrile which comprises reacting an alpha,beta-dihalogenopropionitrile with ammonia in water and/or an organic solvent. Action of a mineral acid on the reaction product gives a mineral acid salt of an alpha-halogeno-beta-aminopropionitrile. An isolated alpha-halogeno-beta-aminopropionitrile and a sulfate thereof are also provided.

Abstract: This invention discloses a heat sensitive recording sheet which contains, as a developer, at least one of the compounds represented by the general formula ##STR1## where R represents hydrogen, an alkyl radical of from 1 to 12 carbon atoms, a cycloalkyl radical of from 3 to 10 carbon atoms, an aralkyl radical of from 7 to 10 carbon atoms, and a phenyl radical, and may be identical to or different from each other, n is zero, or an integer of 1 or 2.The heat sensitive recording sheet of this invention has a sharper rise in developed color density and is advantageous for its handling and storage as well as gives a developed color image having an excellent fastness to light and water resistance in addition to very little decrease in density of the developed color image with time.

Abstract: A process for preparing bisphenol sulfone derivatives represented by the general formula (I) ##STR1## where R stands for hydrogen, a halogen, an alkyl radical, a cycloalkyl radical, an aryl radical, an aralkyl radical, hydroxyl group, an alkoxy radical, allyloxy group, carboxyl group, or a carboalkoxy radical, m is an integer of from 1 to 3, and when m is 2 or more, R may be identical to or different from each other, and adjacent Rs may be combined to form a ring, by oxidizing with hydrogen peroxide a compound represented by the general formula (II) ##STR2## where R and m have the same meanings as defined for the formula (I), and n is zero or 1, in the presence of an alkali in an amount more than the equimolar amount thereof relative to said compound in water and/or an organic solvent which do not form any organic peracids under reaction conditions.

Abstract: An oxidation-reducing reagent for a wet desulfurization process, which comprises (a) one or more compounds selected from the group consisting of salts of substituted anthraquinonesulfonic acids of the general formulas: ##STR1## wherein M stands for a sodium atom, a potassium atom or an ammonium group, and n is an integer of 1 or 2, or (b) a mixture of a salt of anthraquinone-2,7-disulfonic acid and one or more compounds shown by the general formula (I) and/or (II), as well as a process for preparing the compounds of the general formulas (I) and (II).

Abstract: 2,2'-Bisphenol sulfoxides are prepared by oxidizing 2,2'-bisphenol sulfides with hydrogen peroxide in the presence of such an organic solvent as not to form any organic peracids under reaction conditions.

Abstract: A color-developing sheet for pressure-sensitive recording sheets, said sheet comprising as a color-developing agent at least one 2,2'-bisphenolsulfone nickel salt selected from compounds of the following formula ##STR1## wherein R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are identical or different, and represent a hydrogen atom, a halogen atom, an alkyl group containing 1 to 10 carbon atoms, a cycloalkyl group containing 3 to 10 carbon atoms, an aralkyl group containing 7 to 11 carbon atoms, or a phenyl group, or a mixture of at least one 2,2'-bisphenolsulfone nickel salt of the above formulae (II) and (III) and at least one 2,2'-bisphenolsulfone zinc salt of the following formula ##STR2## wherein R.sub.1 and R.sub.2 are the same as R.sub.3 through R.sub.8 defined above.

Abstract: A color-developing sheet for pressure-sensitive recording sheets, said sheet comprising as a color-developing agent at least one 2,2'-bisphenolsulfone zinc salt selected from compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different, and represent a hydrogen atom, a halogen atom, an alkyl group containing 1 to 10 carbon atoms, a cycloalkyl group containing 3 to 10 carbon atoms, an aralkyl group containing 7 to 11 carbon atoms, or a phenyl group.

Abstract: 2,2'-bis[4-(1,1,3,3-tetramethylbutyl)phenol]sulfide is prepared by suspending 4-(1,1,3,3-tetramethylbutyl)phenol in an organic solvent, reacting it with sulfur dichloride or sulfur monochloride at a temperature of from -10.degree. to 40.degree. C., and isolating the precipitate so formed.

Abstract: 1-Aminoanthraquinone of high purity is obtained either by catalytically hydrogenating 5-nitro-1,4,4a,9a-tetrahydroanthraquinone dissolved in a polar organic solvent such as methyl cellosolve (i.e., .beta.-hydroxyethyl methyl ether) in the presence of a hydrogenation catalyst such as palladium on carbon or Raney nickel and then treating the resultant hydrogenated product with a base such as sodium hydroxide or pyridine, or by catalytically hydrogenating the 5-nitro-1,4,4a,9a-tetrahydroanthraquinone in the presence of both the hydrogenation catalyst and the base. By the action of the base, the 5-nitro-1,4,4a,9a-tetrahydroanthraquinone nucleus releases hydrogen atoms and is converted to the anthraquinone nucleus, and the released hydrogen serves to reduce the nitro group. Where an excess of hydrogen is introduced into the reaction system for hydrogenation, 1-aminoanthraquinone is further reduced into a leuco type compound thereof which can easily be returned to 1-aminoanthraquinone by oxidation.