164357-29-3Relevant academic research and scientific papers
Thermolysis of Sterically Stressed Alanates; Synthesis of Two New 1-Sila-3-alanata-cyclobutane Derivatives with Four-membered AlC2Si-Heterocycles
Uhl, Werner,Koch, Matthias,Wagner, Juergen
, (2008/10/08)
The reaction of high shielded alkyl or aryl alanates with LiCH(SiMe3)2 in the presence of the chelating N,N',N''-trimethyl-triazinane yields thesterically stressed alanates [(Me3C)2Al{CH(SiMe3)2}2](1-) 12 and [R-Al{ CH(SiMe3)2}3](1-) (R=Me3SiCH2 13, Et 14, Me 15, C6H5 16) each with a Li(triazinane)2 counter ion. On thermolysis of the sterically most shieldedderivatives 12 and 13 at 130 to 150°C one equivalent of bis(trim ethylsilyl)methane is liberated, and by deprotonation of methyl gorups carbanionic species are formed, which are stabilized by intramolecular coordination to the unsaturated aluminium atoms under formation of AlC2Si heterocycles (19 and 20). 20 was characterized by a single crystal structure determination. The remaining alanates give under similar conditionseither under dismutation the recently published heterocycle 1 with two intact CH(SiMe3)2 groups (14 and 15) or a methyl alanate by the replacem ent of a elementorganic substituent (16).
