Abstract: This invention is an improved process for preparing 2,2-bis(4-aminophenyl)hexafluoropropane which comprises subjecting 2,2-bis(4-aminocarbonylphenyl)hexafluoropropane to the Hofmann reaction and then treating that reaction product under reducing conditions to produce the desired amine in high yield.

Abstract: The invention is directed toward compounds having the formula: ##STR1## wherein A is a substituent independently selected from the group consisting of lower alkyl having from 1 to 3 carbon atoms, chloro or fluoro; n is an integer independently selected from 0 to 2; and X is a halogen selected from the group consisting of chloro and fluoro.Compounds of this invention are useful as intermediates in the preparation of the corresponding diamine compounds resulting from the reductive cleavage of the azo linkage. They may also be used to prepare dyestuffs and photosensitive materials.

Abstract: 3-(Hydroxyphenylphosphinyl)-propanoic acid is produced by reacting phenylphosphonous dichloride with a 0 to 20 percent molar excess of acrylic acid at a temperature of 60.degree. to 150.degree. C., heating the reaction mixture at a temperature of 115.degree. to 150.degree. for at least 45 minutes, and then hydrolyzing the mixture to obtain the desired product.

Abstract: This invention is directed to the acylation of aminosulfonic acids in the solid phase. Two discrete, sequential chemical reactions occur, i.e. (1) the neutralization of the aminosulfonic acid, and (2) the subsequent amine acylation, to produce an improved neutralized acyl-aminosulfonic acid at a reduced cost. Aminosulfonic acids having the general formula HO.sub.3 S-A-NH.sub.2 are acylated to neutralized acyl-aminosulfonic acids having the general formula RCONH-A-SO.sub.3 M, where A is an unsubstituted or substituted aliphatic, aromatic or heteroaromatic group and M is a neutralizing agent moiety. The yield is virtually quantitative.

Abstract: A novel method for the preparation of 4-bromo-1,8-naphthalic acid anhydride is disclosed. This method is carried out by the bromination, with alkali metal bromide or molecular bromine in the presence of a hypohalite, of a di-alkali metal salt of 1,8-naphthalic acid in aqueous solution at a pH of between 6.5 and 9.5 and at a temperature of between 0.degree. and 30.degree. C. to a di-alkali metal salt of 4-bromo-1,8-naphthalic acid and cyclizing to produce 4-bromo-1,8-naphthalic acid anhydride. This novel direct bromination method produces the desired product in good yields and high purity. 4-Bromo-1,8-naphthalic acid anhydride is a valuable intermediate for the preparation of dyestuffs, pigments and optical brighteners.