| | 1 | 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 | | | |
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| default:Reihe_A/51/ZNA-1996-51a-0105.pdf | | | | Identifier
| ZNA-1996-51a-0105 | | | | Volume
| 51 | |
| 2 | Author
| Herbert Binder, Jürgen Palmtag | Requires cookie* | | | Title
| Synthesen und Reaktionen von 4-Bora-2.6-diphospha-1.3.5-triazenen Cyclische Borbetaine Synthesis and Reactions of 4-Bora-2,6-diphospha-l,3,5-triazenes Cyclic Boron Betaines | | | | Abstract
| By substitution of chlorine in the title compound 2,2,4,4,6,6-hexachloro-3,5-dimethyl-4-bora-2,6-diphospha-l,3,5-triazene (1) new members of this class of compounds are synthesized. In most cases reaction starts first on the boron site. The ring reactivity can be accounted for in terms of the charge distribution in the heterocycle 1. In 1 the coupling 2 J(31 P-N-n B) could be detected for the first time. A mechanism for the ring formation is discussed. | | | |
Reference
| Z. Naturforsch. 34b, 179—187 (1979); eingegangen am 15. Juni/4. Oktober 1978 | | | |
Published
| 1979 | | | |
Keywords
| Ring Reactivity, Substitution Reactions, 4-Bora-2, 6-diphospha-l, 3, 5-triazenes | | | |
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| default:Reihe_B/34/ZNB-1979-34b-0179.pdf | | | | Identifier
| ZNB-1979-34b-0179 | | | | Volume
| 34 | |
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