By Norbert Auner, Johann Weis
Organosilicon Chemistry at its top ...((kursiv)) Like its highly profitable predecessors, the 3rd quantity back provides the most recent advancements in a quickly constructing box of industsrial and educational learn. The contributions from approx. eighty the world over popular specialists and researchers during this interesting a part of the speedily turning out to be box of major staff chemistry describe present tendencies in organosilicon chemistry and supply summaries of the newest (1997!) wisdom during this zone. To facilitate entry to the continuing examine this quantity is divided into elements, each one with a entire advent: half 1: attention-grabbing Organosilicon Compounds half 2: Silicon dependent fabrics
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Extra info for Organosilicon Chemistry III: From Molecules to Materials
Sample text
The irradiation of 12 with light of wavelength 254 nm leads to a fourth species, which most likely is the SiNC radical, 13 (IR absorptions at 629 and 1945 cm-I). The formation of 13 is reversible, irradiation with light of wavelength 366 nm leads back to isocyanosilylene (12). References: [I] [2] [3] [4] [5] [6] a) Z. K. Ismail, L. Fredin, R. H. Hauge, J. L. Margrave, J. Chem. Phys. 1982, 77, 1626. b) Z. K. Ismail, R. H. Hauge, L. Fredin, J. W. Kauffman, J. L. Margrave, J. Chem. Phys. 1982, 77, 1617.
Zhang, Chem. Rev. 1995, 95, 1191 C. Maercker, J. Kapp, P. v. :N . Auner, J. Weis), VCH, Weinheim, 1996, p. 329. P. v. Rague Schleyer, ‘%ermanyland Silyl Cations -Free at last“, Science 1997, 275(5296), 39. J. Belzner, “Frei oder nicht frei das ist die Frage Silyl- und Germylkationen in kondensierter Phase“, Angew. Chemie 1997, 109, 1330; Angew. ChemieInt. Ed. Engl. 1997, 36, 1277. ~ ~ Unsaturated Silicon Compounds: L. F. Gusel‘nikov, N. S. Nametkin, “Formations and Properties of Unstable Intermediates 4 B Metals “, Chem.
Dimethylamino- and isopropylaminodisilanes undergo intramolecular a-elimination already at 420°C (residence time 50-70s) to corresponding aminosilylenes and aminosilanes [4]. A temperature above 550°C is necessary to generate silylenes from methylchlorodisilanes [S]. 3 kcal/mol), which could contribute to the lower temperature of formation [6]. Me \ Me I Me2N pSikSi-NMe2 \ Me2NI NMe2 42OOC -A NMe2 :Sic Me + MeSi(NMe2)3 Me Me Me2N \ Me I Si Si-NMe2 I \ Me NMe2 < Me :Si :Si NMe2 Me Scheme 1.