A highly efficient asymmetric inverse-electron-demand oxa-Diels–Alder reaction of o-quinone methides with fulvenes has been realized using a chiral N,N′-dioxide/Sc(III) complex as the catalyst. The corresponding optically active chromane derivatives were obtained in high yields with excellent dr and ee values (up to 99% yield, >19 : 1 dr and 94% ee).
A thermoplastic polymer composition comprises a thermoplastic polymer and a compatibilizing agent comprising a fulvene moiety or a fulvene-derived moiety. A heterophasic polymer composition comprises a propylene polymer phase, an ethylene polymer phase, and a compatibilizing agent comprising a fulvene moiety or a fulvene-derived moiety.
N-(3,5-Dichlorophenyl)-maleimide reacts smoothly with a variety of substituted fulvenes (1) to give only endo adducts (3) independent of the nature of fulvene substituent, Lewis acid catalyst, and reaction solvent and temperature. The structure of the Diets-Alder adduct 3f was determined by X-ray crystallography. Semi-empirical quantum methods (AM1) were used to rationalize the endo stereoselectivity.