Abstract: Disclosed is a process for the preparation of hindered amine light stabilizers by reacting (a) an alkyl substituted-4-hydroxypiperidine with (b) a dicarboxylic acid ester, in the presence of a catalyst system comprising a basic inorganic compound and a polar aprotic organic compound.

Abstract: Disclosed is a process for the preparation of organic esters and amides by reacting (a) a 5 to 60 mole % excess of an ester of (substituted-4-hydroxyphenyl) alkanoic acid with (b) (i) a C.sub.4 -C.sub.20 aliphatic alcohol or thioether alcohol having one or more hydroxyl groups or (ii) an amine of the formula, (R"').sub.2 N(CH.sub.2).sub.n R"" wherein R"' is hydrogen, C.sub.1-7 alkyl, C.sub.5-12 cycloalkyl, or C.sub.6-12 aryl, provided that one R"' is hydrogen, and R"" is hydrogen or N(R"').sub.2 wherein R"' is a defined above, in the presence of a catalyst system comprising a basic inorganic compound and a polar aprotic organic compound. The process provides higher yields of the desired product, shorter reaction times, and reduces the production of undesirable side-products.

Abstract: Crystalline 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane is made by crystallizing the diamino reaction mass from a toluene/heptane solution. The material has been previously purified through a combination of acetic acid washing and treatment with acidic clay. The diamino material, also known as DAPI, is a potential stabilizer, curing agent, and one of the monomers used to produce a polyimide resin.