Organosilicon synthesis of isocyanates: I. Synthesis of isocyanates of the furan, thiophene, and mono-and polyfluorophenyl series
作者:A. V. Lebedev、A. B. Lebedeva、V. D. Sheludyakov、S. N. Ovcharuk、E. A. Kovaleva、O. L. Ustinova
DOI:10.1134/s1070363206010208
日期:2006.1
A convenient synthesis of known and unknown isocyanates of the furan, thiophene, and mono- and polyfluorophenyl series, involving silylation of starting amines with hexamethyldisilazane or chlorotrimethylsilane, followed by phosgenation of the resulting N-silyl-substituted amines. An unusual high-temperature rearrangement of 3-(methoxycarbonyl)-4,5-dimethylthiophene-2-yl isocyanate into its 5-ethyl isomer. ortho-Fluorine substituent in anilines decreases the yield of isocyanates, whereas 2,3,5,6-tetrafluorophenyl isocyanate exists for only a short time as a 5% toluene solution.
Unusual behavior nitrogen-containing compounds in the synthesis of O-silylurethanes and trimethylsilylureas
作者:L. O. Belova、M. V. Pletneva、M. G. Shamina、N. A. Golub、A. A. Korlyukov、A. D. Kirilin
The syntheses and crystal structures of three new furfurylamides are described, tetrameric lithium furfurylamide (1), dimeric magnesium furfurylamide (2), and dimeric dimethylaluminiumfurfurylamide (3). The compounds were characterized by 1H-, 13C-, 29Si- and 7Li- NMR spectroscopy and by X-ray crystallography.