| abstract |
The new silylalkyl or alkenyl compounds correspond to the general formula (I) n n n The symbols A¹, A², A³ mean aromatic or heteroaromatic molecular building blocks such as 1,4-phenylene or pyrimidine-2,5-diyl, which have a single bond (at k, m = zero) or functional groups M¹, M² such as CO- O or CH₂-O are linked; j, k, l, m, n are zero or 1 (j + l + n = 2 or 3). The radicals R², R³, R⁴, R⁵ are H or alkyl / alkenyl, cycloalkyl, the radicals R⁶, R⁷, R⁸ also have a comparable meaning (H); R¹ is alkyl / alkenyl or one of the substituents known from LC chemistry, such as an α-haloalkanoic acid residue. Some of the compounds have broad and polymorphic, liquid-crystalline phases. |