Patent ID: 7053173

Claim:
A novel tri- or tetra-thiol or thiolate of biphenyl, biphenyl derivatives, terphenyl or terphenyl derivatives represented by general formula A, wherein, M 1 and M 2 are the groups selected independently from the group consisting of H, Na, Li and K, R 1 –R 7 are the groups selected independently from the group consisting of H, substituted or not substituted alkyl group, substituted or not substituted phenyl group, naphthyl group, benzyl group, pyridyl group, substituted or not substituted alkoxy group, alkoxycarbonyl group, aldehyde group, nitroso group, nitro group, substituted or not substituted amino group, substituted or not substituted phenylazo group, alkylazo group, substituted or not substituted alkylthio group, substituted or not substituted phenylthio group, substituted or not substituted alkylsulfinyl group, phenylsulfinyl group, substituted or not substituted alkylsulfonyl group, phenyl sulfonyl group, divalent benzophenone residue, phenylether residue, alkylene group, cyclo alkylene group, pyridilene group, ester residue, carbonyl group and biphenylyl group, and R 1 –R 7 on each phenyl group can be same or can be different, E 1 and E 2 are the groups selected independently from the group consisting of SM 3 and SM 4 , wherein M 3 and M 4 are selected independently from the group consisting of the groups defining M 1 and M 2 mentioned above, or groups defining R 1 –R 7 mentioned above, n is 1 or 0 and when n is 0, E 1 and E 2 are SM 3 and SM 4 and when n is 1 E 1 and/or E 2 is SM 3 and/or SM 4 .