ZfN: Search Results

1	Author	C. Kerst, P. Potzinger, H. Gg, Wagner	Requires cookie*
	Title	Reaction of Trimethyl-and Dimethyl-Silyl Radicals with Pentamethyldisilane
	Abstract	The rate constant for the H atom abstraction of trimethylsilyl radicals from pentamethyldisilane k (4) (&(4)) was measured relative to the trimethylsilyl combination reaction k(3). A value for • ]/k (3) = (8.53±0.08) • 10" 11 cm 3 ' 2 s~ 1/2 was obtained. For the dimethylsilyl radical, a smaller value for the corresponding rate constant ratio (5.9 + 0.2) • 10" 11 cm 3 ' 2 s" 1/2 was measured, and this was attributed to a disproportionation reaction between the dimethylsilyl and the pentamethyldisilyl radical leading to dimethylsilylene.
	Reference	Z. Naturforsch. 51a, 102—104 (1996); received October 28 1995
	Published	1996
	Keywords	Hydrogen abstraction, silyl radicals, pentamethyldisilane, disproportionation reaction
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_A/51/ZNA-1996-51a-0102.pdf
	Identifier	ZNA-1996-51a-0102
	Volume	51

2	Author	C. Kerst, P. Potzinger, H. Gg, Wagner	Requires cookie*
	Title	The Mercury-Sensitized Photolysis of Pentamethyldisilane
	Abstract	Two primary processes were observed in the Hg-sensitized photolysis of Me 5 Si 2 H: (I) hydrogen abstraction from the Si-H bond with a quantum yield of 0(1) = 0.85, (V) Si-Si bond breaking with 0(V) = 0.04. The hydrogen atoms formed in (/) undergo an H atom abstraction reaction (k(3)), as well as substitution reactions at the Si centers resulting in the formation of dimethylsilane and trimethylsilyl radical (k(4)) or trimethylsilane and dimethylsilyl radical (k(5)). The following branching ratios have been determined: M = 0.87. M 0.096, M = 0.034. k(3) + k(4) + k(5) k(3) + k(4) + k(5) k(3) + k(4) + k(5) The ratio of disproportionation (A: (2)) to combination (£(1)) for the pentamethyldisilyl radical has been determined with MeOH as the scavenger for 1-methyl-l-trimethylsilylsilene, 0.046 < k(2)/ A: C1) < 0.071. A mechanism with pertinent rate constants has been proposed which accounts for the results.
	Reference	Z. Naturforsch. 51a, 105—115 (1996); received October 28 1995
	Published	1996
	Keywords	Hg-sensitized photolysis, pentamethyldisilane, mechanism, substitution reaction, silyl rad-ical disproportionation
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_A/51/ZNA-1996-51a-0105.pdf
	Identifier	ZNA-1996-51a-0105
	Volume	51