2551-83-9Relevant articles and documents
HETEROGENEOUS REACTIONS VIII. THE HETEROGENEOUS GAS/SOLID REACTION OF 3-CHLOROPROPYLTRIMETHOXYSILANE WITH LITHIUM, SODIUM AND POTASSIUM METHOXIDES
Hopper, Steven P.,Tremelling, Michael J.,Goldman, Emma W.
, p. 363 - 370 (1980)
The heterogeneous gas/solid reaction of 3-chloropropyltrimethoxysilane with the solid alkoxide bases lithium, sodium and potassium methoxide has been studied at 150 and 190 deg C.The lithium compound yields solely 3-methoxypropyltrimethoxysilane in a convenient, high yield reaction.Reaction with sodium methoxide gave products resulting from substitution at silicon and carbon as well as elimination products.Potassium methoxide is the least reactive of the three bases studied and gave products similar to those of the sodium methoxide system.Under the conditions of heterogeneous reaction, some cleavage of the chloropropyl group is observed.It is suggested that this cleavage follows base-induced elimination to give allyltrimethoxysilane.
Spectra and structure of small ring compounds - LXI. IR and Raman spectra, vibrational assignment, conformational stability and ab initio calculations of cyclopropylmethylsilane
Little, T. S.,Zhu, Xiang,Wang, Aiying,Durig, J. R.,Dakkouri, M.,et al.
, p. 1913 - 1934 (2007/10/02)
The IR (3500-50 cm-1) and Raman (3500-20 cm-1) spectra of gaseous and solid cyclopropylmethylsilane, c-C3H5-CH2SiH3, have been recorded.Additionally, we have obtained the Raman spectrum of the liquid and the IR spectrum of the sample trapped in an argon matrix.From these data a complete assignment of the normal vibrational modes is provided.The spectra of the gaseous and liquid phases have been interpreted on the basis of the predominance of a conformation having a gauche structure and this form exists exclusively in the solid.Ab initio Hartree-Fock structural optimizations with the 3-21G* and 6-31G* basis sets are consistent with the gauche rotamer lying ca. 800 cm-1 lower in energy than the cis conformation which has the SiH3 group cis to the cyclopropyl ring.The force fields obtained with the 3-21G* basis set have been used to perform a normal coordinate analysis.The cyclopropyl torsion has been observed as an IR band of hybrid contour centered at 80 cm-1 in the far-IR spectrum of the gas.Combination band spectra in the 2300-2000 cm-1 region of the mid-IR spectrum of the gas can be attributed to sum and difference bands of the SiH3 and cyclopropyl torsional modes with an SiH3 stretching mode.Analysis of these data leads to a barrier governing internal rotation of the silyl group of 687 +/- 50 cm-1.These results are compared with corresponding quantities in some similar molecules.
