Add time:07/25/2019 Source:sciencedirect.com
1-(N,N-dimethylamino)-1-silacyclohexane 1 was synthesized. Contributions of the conformers of 1, Eq-trans: Eq-gauche: Ax-trans, were found to be 55(15):15(15):30(15) mol.% in gas phase at 288 K from gas electron diffraction. The enthalpy ΔH = 0.29(15) kcal/mol for Ax-to-Eq transition was measured by temperature dependent Raman spectroscopy of liquid 1 and its solutions. Geometry, conformational properties and intramolecular conversion were explored by theoretical calculations. The nitrogen bond configurations for 1 was found to be close to planar, with a sum of the bond angles of ca. 350-355° that is quite different from those analogs in which the N atom is connected to a carbon atom rather than to a silicon atom.
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