- METHOD FOR PRODUCING HYDROCARBON OXYSILICON COMPOUNDS
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The invention relates to a method for producing silicon compounds (A) having hydrocarbon oxy-groups that have at least one unit of the general formula (1) HmSi (OR)n (OR′) oR″pX4-m-n-o-p (1) by conversion of silicon compounds (B) having at least one unit of the general formula (2) Hm+nSi(OR′)oR″pX4-m-n-o-p (2), having an alcohol of the general formula (3) ROH (3) in the presence of a catalyst (K) that is on a carrier material bonded metal selected from Ni, Pd, Pt, wherein per mol formed group OR, at maximum 1 liter of solvent is used and wherein R, R′, R″, X, m, n, o and p have the meanings listed in claim 1.
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Page/Page column 6
(2012/01/15)
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- Rate studies of the acid-catalyzed solvolysis of eight-membered cyclosilazoxanes
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The solvolysis of N-phenyl-1,1,3,3,5,5,7,7-octamethyl-1,3,5,7-tetrasila-2-aza-4,6,8-trioxacyclooctane (1) and N,N'-diphenyl-1,1,3,3,5,5,7,7-octamethyl-1,3,5,7-tetrasila-2,6-diaza-4,8-dioxacyclooctane (II) in methanol/water in the presence of an acetate buffer is a pseudo-first-order process, subject to general acid-catalysis.The catalytic rate constants have been determined spectrophotometrically for the solvolysis of I.The ring cleavage is slower than that of analogous six-membered cyclosilazoxanes, but the catalytic mode and the solvent isotope effect indicate a close mechanistic similarity between the solvolyses of six- and eight-membered rings.
- Lasocki, Zygmunt,Witekowa, Malgorzata
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- KINETICS OF THE ACID-CATALYSED SOLVOLYSIS OF SIX-MEMBERED CYCLOSILAZOXANES CONTAINING TWO SILAZANE BONDS
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The solvolysis of N,N'-diphenyl-1,1,3,3,5,5-hexamethyl-1,3,5-trisila-2,4-diaza-6-oxacyclohexane (II) in methanol/water in the presence of an acetate buffer is a two-step, pseudo-first-order, process.Both steps are subject to general acid catalysis and their catalytic rate constants have been determined spectrophotometrically.The ring cleavage is faster than that of analogous cyclosilazoxanes containing a single silazane bond (I), but the catalytic mode, substituent effects, and the solvent isotope effect indicate a close mechanistic similarity for the solvolysis of I and II.
- Lasocki, Zygmunt,Witekowa, Malgorzata
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- Direct Thermal and Photochemical Generation of Silanones
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2-Silapyrans (1,2-oxasilins) are synthesized by the pyrolysis of 1-disilanyl-4-methoxy-1,3-butadienes via initial 1,5-silyl migration to afford an intermediate 1-sila-1,3-butadiene.Diels-Alder reaction of the silapyrans and perfluoro-2-butyne does not lead to isolable adducts but rather leads to apparent extrusion of silanone (R2Si=O), which is trapped by a variety of reagents.Reaction of the silapyrans and maleic anhydride provides stable adducts that extrude silanones upon either thermolysis or photolysis.No evidence could not be found for rearrangement of a silylsilanone to a siloxysilylene.
- Hussmann, Gregory,Wulff, William D.,Barton, Thomas J.
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p. 1263 - 1269
(2007/10/02)
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- Studies of silyl and germyl Group VI species. Part IV. Dimethyl- and tetramethyl-disilyl chalcogenides and related species
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The symmetrically substituted disilyl chalcogenides (MenH3-nSi)2E where E = O, S, Se, Te; n = 0 -> 3, have been prepared and characterized spectroscopically and by cleavage reactions.The synthetic routes include reactions of halogenosilanes with water, mercury(II) sulfide, lithium telluride, and complex thio- and seleno-aluminates.The spectroscopic properties of the (MeH2Si)2E and (Me2HSi)2E species, which have not been reported previously, are discussed in some detail.
- Drake, John E.,Glavincevski, Boris M.,Hemmings, Raymond T.
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p. 2161 - 2166
(2007/10/02)
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