Abstract
The first representatives of aryloxy-trimethylsilatranes, C 6H 5OSi[OCH(CH 3)CH 2] 3N, of aryloxy-carbasilatranes, C 6H 5OSi(CH 2CH 2CH 2)(OCH 2CH 2) 2N, and a number of novel 3,7,10-trimethylsilatranes (RSi[OCH(CH 3)CH 2] 3N) and carbasilatranes (RSi(CH 2CH 2CH 2)(OCH 2CH 2) 2N) have been prepared and characterised, both structurally and by NMR spectroscopy. The influence of various Si substituents (R = alkyl, aryl, alkoxy and aryloxy) as well as the influence of the substitution in the skeleton of the trimethylsilatranes and carbasilatranes on the chemical shift in the 29Si, 1H and 13C NMR spectra has been investigated. The crystal structures of both diastereomers of phenyl-3,7,10-trimethylsilatrane and of the symmetrical isomer of p-tolyl-3,7,10-trimethylsilatrane were determined by X-ray diffraction after separation of the diastereomers by means of HPLC. All three crystal structures are centrosymmetric.
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