SynopsisThe use of 1,3-di (5-[ 2,2,1] -bicyclohexyl-2,3-dicarboxylic anhydride) -1,1,3,3-tetramethyldisiloxane, 1, as a curing agent in the presence of typical epoxy resins with Lewis bases as catalysts produces thermosets with HDTs of 32OoC. The solubility of 1 in the epoxy resin allows for the preparation of a one-component formulation. A latent catalyst was developed which employs amine complexes of cobalt bis (2,4-pentanedionate). These formulations exhibit long term storage a t ambient conditions, yet cure rapidly a t 180-200°C.