Abstract: Hydantoins of the formula ##STR1## wherein R.sub.1 is hydrogen or alkyl of 1 to 8 carbon atoms, R.sub.2 is ##STR2## R.sub.3 is alkyl of 1 to 8 carbon atoms, and X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group; or R.sub.1 and R.sub.2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR3## ARE PREPARED BY REACTING FIRST .alpha.,.beta.-UNSATURATED ALDEHYDES OR KETONES WITH ALKYL PHOSPHITES TO FORM A PHOSPHONATE ALDEHYDE OR KETONE FOLLOWED BY A CLASSICAL Bucherer hydantoin synthesis.

Abstract: Hydantoins of the formula ##STR1## wherein R.sub.1 is hydrogen or alkyl of 1 to 8 carbon atoms, R.sub.2 is ##STR2## R.sub.3 is alkyl of 1 to 8 carbon atoms, and X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group; or R.sub.1 and R.sub.2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR3## moiety are prepared by reacting first .alpha.,.beta.-unsaturated aldehydes or ketones with alkyl phosphites to form a phosphonate aldehyde or ketone followed by a classical Bucherer hydantoin synthesis.These compounds are intermediates for the preparation of polyglycidyl compounds useful in making flame-retardant epoxy resins. These hydantoins are also intermediates useful in preparing flame-retardant polyesters and polyurethanes.

Abstract: Hydantoins of the formula ##STR1## wherein R.sub.1 is hydrogen or alkyl of 1 to 8 carbon atoms, R.sub.2 is ##STR2## R.sub.3 is alkyl of 1 to 8 carbon atoms, and X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group; or R.sub.1 and R.sub.2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR3## moiety are prepared by reacting first .alpha.,.beta.-unsaturated aldehydes or ketones with alkyl phosphites to form a phosphonate aldehyde or ketone followed by a classical Bucherer hydantoin synthesis.These compounds are intermediates for the preparation of polyglycidyl compounds useful in making flame-retardant epoxy resins. These hydantoins are also intermediates useful in preparing flame-retardant polyesters and polyurethanes.

Abstract: Hydantoin diglycidyl compounds of the formula ##STR1## wherein R.sub.1 is hydrogen, alkyl containing 1 to 8 carbon atoms or cycloalkyl containing 5 to 6 carbon atoms; and R.sub.2 is alkyl containing 5 to 8 carbon atoms or cycloalkyl containing 5 to 6 carbon atoms, are prepared. The diglycidyl compounds are liquid at room temperature, easily processable as casting and laminating resins and when cured possess excellent resistance to water.

Abstract: Polyamide-imides with phenylindane diamines incorporated into the polymer backbone have been found to be soluble in high concentration in polar organic solvents.

Abstract: A mixture of phenylindane diamines is prepared by a process comprising acid-catalyzed dimerization of .alpha.-methylstyrene and subsequent nitration and reduction of the phenylindane reaction product. This phenylindane diamine mixture is useful in polymide polymers and as a curing agent for epoxy resins.

Abstract: Polyimides having a recurring unit ##SPC1##Wherein R is an organic blocking group; A is NH, O or S; Z is the direct bond, O, S, SO.sub.2, ##EQU1## or CH.sub.2 ; n is 0 or 1; and R.sup.1 is a divalent organic radica are prepared by reacting a diamine with a s-triazine dianhydride. These polyimides can be fabricated into films, coatings, laminates and the like. The polyimides are also fusible and moldings thus obtained are low in void content.

Abstract: s-Triazine tetracarboxylic acids having the formula ##SPC1##Wherein R is an organic blocking group; A is NH, O, or S; Z is the direct bond, O, S, SO.sub.2, ##EQU1## or CH.sub.2 ; and n is 0 or 1, can be prepared by reacting a dihalo triazine with a dicarboxylic acid substituted with an amino, hydroxy, or mercapto group. By dehydrating the acid a corresponding dianhydride is obtained. These compounds are useful in preparing various polymers, as, for example, polyimides.