| abstract |
The present invention relates to a binaphthyl compound of formula (I), which is suitable as a monomer for preparing polycarbonate resins having beneficial optical properties, and can be used for preparing optical lenses: Where X is C 2 -C 4 -alkandiyl or C 1 -C 4 -alkandiyl-C (O)-, wherein C (O) is an oxygen atom bonded to a hydroxyl group and wherein C 2 -C 4- Alkanediyl or C 1 -C 4 -alkanediyl is unsubstituted or carries a phenyl ring, respectively; R and R ′ are the same or different and are selected from monocyclic or polycyclic having 6 to 36 carbon atoms Aryl groups and monocyclic or polycyclic heteroaryl groups having a total of 5 to 36 atoms, and their ring members, wherein 1, 2, 3 or 4 of these atoms are selected from nitrogen, sulfur and oxygen, and so on The rest of the atoms are carbon atoms, of which monocyclic or polycyclic aryl groups and monocyclic or polycyclic heteroaryl groups are unsubstituted or carry 1 or 2 free radicals R a , which are selected from CN, CH 3 , OCH 3 , O-phenyl, O-naphthyl, S-phenyl, S-naphthyl, Cl or F, and, if X is C 1 -C 4 -alkyldiyl-C (O)- , an ester, especially its C 1 -C 4 - alkyl ester. |