| abstract |
Methylene dithiepane silanes according to Formula Iin which R<1 >is a saturated or unsaturated aliphatic or alicyclic hydrocarbon radical with 1 to 10 carbon atoms, which can be interrupted by one or more oxygen and/or sulphur atoms and can contain one or more ester, carbonyl, amide and/or urethane groups, or is an aromatic or heteroaromatic hydrocarbon radical with 6 to 18 carbon atoms, the hydrocarbon radicals being able to be substituted or unsubstituted; R<2 >has one of the meanings given for R<1 >or is absent; R<3 >has one of the meanings given for R<1 >or is absent; R<4 >is equal to -(CHR<6>)n-, -Y-CO-NH-(CHR<6>)n-, -Y-CO-NH-R<5>-, -(CHR<6>)n-S-R<5>-, -S-R<5>-, -CO-O-R<5>- or is absent, with n being equal to 1 to 4, R<6 >is hydrogen, C1 to C10 alkyl or C6 to C10 aryl, R<5 >has one of the meanings given for R<1 >and Y stands for an O or S atom or is absent; with R<5 >and R<6 >being able to be substituted or unsubstituted; X is a hydrolyzable group; a, b, c and x each independently of each other being 1, 2 or 3; and the sum of a+x=2 to 4. The silanes are particularly suitable for the preparation of dental materials. |