| abstract |
Abstract of the disclosure Fullerene derivatives, a process for their preparation, and their use A process for preparing a methano-bridged fullerene derivative is described wherein a fullerene or fullerene derivative is reacted with a phosphorus ylide in an inert organic solvent at a temperature of from -78 to 180°C. Process products of the formula (II), (II) in which the symbols and indices have the following meanings: F: is a fullerene radical of the formula C20 + 2m, with m = 2 to 100; R4: is H, CH3, -phenyl or R5; R5: is a straight-chain or branched (with or without an asymmetric carbon atom) C2-C20-alkyl group, where one or more non-adjacent CH2 groups can be replaced by -C?C, -CH=CH-, -O-, -S-, -COO-, -OOC-, -SiR?-, -CO-, phenylenediyl or cyclohexylenediyl, and where one or more hydrogen atoms can be replaced by F, Cl, Br, I, OH or a tetrahydropyranyloxy group, or R4 and R5 together are =C=X with X being O, S, NR3 or (O-R3)2: R3: is phenyl or C1-C12-alkyl; n: is from 1 to 6; are novel. Compounds according to the invention and prepared in accordance with the invention are suitable for use in optoelectrical units. |