Bildung siliciumorganischer Verbindungen. 70 [1]. Reaktionen Si-fluorierter 1,3,5-Trisilapentane mit CH3MgCl und LiCH3 |
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Authors: | G Fritz W H Dressel |
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Abstract: | Formation of Organosilicon Compounds. 70. Reactions of Si-fluorinated 1,3,5-Trisilapentanes with CH3MgCl and LiCH3 F3Si? CCl2? SiF2? CH2? SiF3 3 reacts with meMgCl. (me = Ch3 starting with a Si-methylation and not with a C-metallation as in the corresponding Si- and C-chlorinated compounds, e. g. (Cl3Si? CCl2)2SiCl2 2]. A CCl-hydrogenation is observed too, which in the case of F3Si? CCl2? SiF2? CHCl? SiF3 4 gives meS3Si? CCl2? Sime2? CH2? Sime3. (F3Si? CCl2)2 5 reacts with meMgCl to form preferentially 1,2-Disilapropanes by cleaving a Si? Cbond. The isolation of F3Si? CCl2H and meF2Si? CCl2? SiF2me allows to locate the bond where 5 is cleaved at the beginning of the reaction. With meLi 5 reacts to form mainly me3Si? C?C? Sime3, showing that in the reaction of meLi, being a stronger reagent than meMgCl, and 5 a C-metallation occurs, following the same mechanism as in the reaction with (Cl3Si? CCl2)2)SiCl2 2]. The reaction conditions for the synthesis of Si-fluroinated and C-chlorinated 1,3,5-Trisilapentanes in a 0.1 mol scale are reported. N.m.r. data of all investigated compounds are tabulated. |
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