Hydrosilylation reactions of tetramethyldisilazanes and their derivatives
摘要:
Hydrosilylation between 1,1,3,3-tetramethyldisilazane (A) and 1,3-divinyl-1,1,3,3-tetramethyldisilazane (B) occurs rapidly at 90 degreesC in the presence of Karstedt's catalyst to give a product mixture consisting mainly of large macrocycles. Deprotonation-substitution reactions of these macrocycles were largely unsuccessful. Trimethylsilylated and methylated derivatives of A and B were prepared and used in hydrosilylation reactions. High-yield formation of large macrocycles was observed when the trimethylsilylated or methylated derivative of B was reacted with unmodified A. The methylated product was successfully deprotonated and functionalized with trimethylsilyl groups. (C) 2002 Elsevier Science B.V. All rights reserved.
The controlled synthesis of nematic nanophase-separated materials poses an attractive synthetic challenge. The use of carbosilazane multipodes and dendrimers (such as 1) in conjunction with laterally attached mesogens allows the systematic investigation of the structure-property relationships of room-temperature nematic liquid crystals.
Elsaesser, R.; Goodby, J. W.; Mehl, G. H., Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals, 2003, vol. 402, p. 1 - 8
作者:Elsaesser, R.、Goodby, J. W.、Mehl, G. H.、Rodriguez-Martin, D.、Richardson, R. M.、Photinos, D. J.、Veith, M.