Patent ID: 7057074

Claim:
A method of preparing bisphenylene-spirobifluorene compound of formula: the method comprising the steps of: reacting a biphenyl compound of formula: with N-bromosuccinimide followed by adding boron tribromide, and wherein R 1 and R 2 are identical or different and are independently a straight-chain or branched alkyl group having from 1 to 22 carbon atoms, and X 1 and X 2 independently contains one or more elements selected from the group consisting of C, O, N, S, Si and Ge; forming a biphenylyl-halogenated fluoreneol compound having the X 1 R 1 and X 2 R 2 by reacting the biphenyl compound with halogenated fluoreneone; forming a halogenated spirobifluorene compound having the X 1 R 1 and X 2 R 2 from the biphenylyl-halogenated fluoreneol compound by cyclization; and forming a bisphenylene-spirobifluorene compound having the X 1 R 1 and X 2 R 2 by substituting halogen of the halogenated spirobifluorene compound by a phenyl group.