33558-55-3Relevant academic research and scientific papers
Me3Si?SiMe2[oCON(iPr)2?C6H4]: An Unsymmetrical Disilane Reagent for Regio- and Stereoselective Bis-Silylation of Alkynes
Xiao, Peihong,Cao, Yanjun,Gui, Yingying,Gao, Lu,Song, Zhenlei
supporting information, p. 4769 - 4773 (2018/03/21)
The air-stable unsymmetrical disilane Me3Si?SiMe2[oCON(iPr)2C6H4] has been developed for bis-silylation of alkynes. This reagent tolerates a range of functional groups, providing Z-vinyl disilanes in
Kinetic Control in the Cleavage of Unsymmetrical Disilanes
Hevesi, Laszlo,Dehon, Michael,Crutzen, Raphael,Lazarescu-Grigore, Adriana
, p. 2011 - 2017 (2007/10/03)
A series of 12 phenyl-substituted arylpentamethyldisilanes 1a-1 have been synthesized in order to examine the regioselectivity of their nucleophilic Si,Si bond cleavage reactions under Still's conditions (MeLi/HMPA/0°C). It has been found that the sensitivity of these reactions to the electronic effects of the substituents in the phenyl ring could be described by the Hammett-type equation log(kA/kB) = 0.4334 + 2.421(Σσ); (correlation coefficient R = 0.983). The kA/kB ratio represents the relative rate of attack at silicon atom A (linked to the aryl ring) or at silicon atom B (away from the aryl ring) of the unsymmetrical disilanes. Thus, the present investigation shows that the earlier belief according to which the nucleophilic cleavage of unsymmetrical disilanes always produces the more stable silyl anionic species (thermodynamic control) should be abandoned, or at least seriously amended: kinetic factors appear to exert a primary influence on the regioselectivity of such reactions. Since the two major kinetic factors (i.e., electrophilic character of and steric hindrance at a given silicon atom) have opposite effects on the orientation of the reaction, it may happen that kinetic and thermodynamic control lead to the same result. For some of the unsymmetrical disilanes studied, the major reaction path was not the Si,Si bond cleavage; instead, Si-aryl bond breaking occurred, producing the corresponding aryl anions.
Peculiarities in the cleavage by methyllithium of unsymmetrical disilanes
Hevesi,Dehon
, p. 8031 - 8032 (2007/10/02)
The title reactions did not produce the more stable silyl anions from the disilanes studied, they either occurred by attack at the more electrophilic silicon atom, or led to unexpected products.
