Pentamethyldisiloxane → 4-Cyanophenyl 4-(6-pentamethyldisiloxanylhexyloxy)benzoate

Beteiligte Stoffe

Reaktionsschritte

0.94 g (0.024 mmol of Pt) of 0.5% strength dicyclopentadienylplatinum dichloride solution (dichloromethane) was added to a solution of 13.8 g (42.9 mmol) of 4-cyanophenyl 4-(5-hexenyloxy)benzoate and 6.48 g (43.7 mmol) of pentamethyldisiloxane in 50.0 g of toluene, and the mixture was refluxed for 3 hours. After complete hydrosilylation of the olefin, a further 0.94 g (0.024 mmol of Pt) of 0.5% strength dicyclopentadienylplatinum dichloride solution (dichloromethane) were added, and the mixture was refluxed for a further 2 hours. The reaction mixture was flushed with nitrogen, and the toluene was removed by vacuum distillation on a rotary evaporator. The crude product was purified by chromatography on silica gel. The 4-cyanophenyl 4-(6-pentamethyldisiloxanylhexyloxy)benzoate obtained was additionally recrystallized from petroleum ether (100° C.-140° C.) and exhibited the following phase behavior: c 54-55 (sA 53-55) i.

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