Abstract: An improved process for preparing imides comprises reacting acid anhydrides with organic isocyanate groups in the presence of cyanide ion as a catalyst.

Abstract: A process for the purification of crude 3,3'-diaminobenzidine comprising contacting it with sulfuric acid. The 3,3'-diaminobenzidine can be produced by the reaction of NH.sub.3 and 3,3'-dichlorobenzidine in the presence of various catalysts.

Abstract: This invention relates to a process of preparing phthalein indicator dyes including phthalides and naphthalides derived from certain hydroxy-substituted carbocyclic aryl compounds, such as phenols, and from certain N-heterocyclic aryl compounds, such as indoles, and to a process of preparing novel intermediates useful therein. According to the present invention, the selected carbocyclic compound or the selected N-heterocyclic compound is reacted with phthalaldehydic or naphthalaldehydic acid to form the corresponding (na)phthalidyl adduct which is treated with an oxidizing agent to yield the subject intermediates. To prepare the indicator dye, the intermediate, i.e., the oxidation product thus obtained is then reacted with a carbocyclic or heterocyclic aryl compound to yield the corresponding indicator dye. The oxidation products comprising the novel intermediates of the present invention may be dehydro or hydrated (na)phthalidyl adducts.

Abstract: This invention is concerned with a novel class of protonated compounds, namely, 3-(indol-3-yl)dehydronaphthalide hydrochlorides, with their synthesis by the reaction of a 3-(indol-3-yl)naphthalide and a high-potential quinone in an inert anhydrous aprotic solvent in the presence of a carboxylic acid catalyst, and with the synthesis of indole naphthalide indicator dyes by reacting the said dehydronaphthalide hydrochlorides and an indole in an aromatic hydrocarbon solvent in the presence of a carboxylic acid catalyst.

Abstract: Dyes of the formula ##EQU1## WHEREIN R.sub.c is a monovalent chromophoric radical, M is a sulfonyl, carbonyl, or carbonyloxy bridging radical, R.sub.f is a monovalent saturated fluoroaliphatic radical, and R is a monovalent organic radical selected from cyano, MR.sub.f, or aryl sulfonyl. A wide spectrum of unusually brilliant colors is available.

Abstract: o-nitrobenzylketones are prepared by reacting a trans-.beta.-substituted amino-2-nitrostyrene with a lower alkanoyl halide, halo-lower alkanoyl halide, phthalimido-lower alkanoyl halide, benzoyl halide or substituted benzoyl halide, and subsequently hydrolyzing the resulting product to yield the desired o-nitrobenzylketone.

Abstract: This invention relates to a new class of phthalein dyes useful as the color-forming material in either pressure sensitive or heat sensitive mark-forming systems. Such dyes comprise 3,3-disubstituted phthalides and 3,3-disubstituted naphthalides wherein the 3,3 substituents are indolin-5-yl radicals.

Abstract: The present invention concerns compounds of Formula I ##SPC1##wherein R.sub.1 is hydrogen, lower alkyl, aralkyl; R.sub.2 is hydrogen, lower alkyl, lower alkoxy, halogen, trifluoromethyl, cyano, nitro, and the like; R.sub.3 is lower alkyl; ##EQU1## (where R.sub.4 and R.sub.5 are lower alkyl), ##EQU2## (where R.sub.6 is hydrogen, lower alkyl, aryl, acetamido and R.sub.7 is lower alkyl), ##SPC2##(where R.sub.8 and R.sub.9 are hydrogen or lower alkyl), --CH(SO.sub.2 C.sub.6 H.sub.5).sub.2, ##SPC3## ##EQU3## (where R.sub.10 is hydrogen, CN, acyl), ##EQU4## (where R.sub.11 and R.sub.12 are lower alkyl), --SO.sub.2 C.sub.6 H.sub.5, --CONH.sub.2, --CO.sub.2 R.sub.13 (where R.sub.13 is lower alkyl), ##EQU5## (R.sub.14 and R.sub.15 are lower alkyl). These compounds are useful as sedatives and antiaggression agents.

Abstract: New curable monomeric aromatic imidodicarboxylic acid diallyl esters, such as 4-allyloxycarbonyl-N-(allyloxycarbonyl-methyl)phthalimide, 1,2-ethylene bis (4-allyloxycarbonylphthalimide), or N,N'-allyloxycarbonylmethyl) pyromellitimide. When heated in the presence of a free radical initiator, these monomers give cured polymers having very superior mechanical strength, thermal stability, chemical resistance and electrical properties. If this polymerization is stopped before the reaction mixture is gelled, prepolymers can be obtained. The cured polymers are especially useful as electronics materials and engineering plastics.

Abstract: This invention relates to a process of preparing phthalein indicator dyes including phthalides and naphthalides derived from certain hydroxy-substituted carbocyclic aryl compounds, such as phenols, and from certain N-heterocyclic aryl compounds, such as indoles, and to a process of preparing novel intermediates useful therein. According to the present invention, the selected carbocyclic compound or the selected N-heterocyclic compound is reacted with phthalaldehydic or naphthalaldehydic acid to form the corresponding (na)phthalidyl adduct which is treated with an oxidizing agent to yield the subject intermediates. To prepare the indicator dye, the intermediate, i.e., the oxidation product thus obtained is then reacted with a carbocyclic or heterocyclic aryl compound to yield the corresponding indicator dye. The oxidation products comprising the novel intermediates of the present invention may be dehydro or hydrated (na)phthalidyl adducts.