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http://dx.doi.org/10.5012/bkcs.2010.31.5.1349

Theoretical Studies on the Alkylidene Silylenoid H2C = SiLiF and Its Insertion Reaction with R-H (R = F, OH, NH2)  

Tan, Xiaojun (College of Medical and Life Science, University of Jinan)
Wang, Weihua (College of Chemistry Science, Qufu Normal University)
Li, Ping (College of Chemistry Science, Qufu Normal University)
Li, Qingyan (College of Medical and Life Science, University of Jinan)
Cheng, Lei (College of Medical and Life Science, University of Jinan)
Wang, Shufen (College of Medical and Life Science, University of Jinan)
Cai, Weiwang (College of Medical and Life Science, University of Jinan)
Xing, Jinping (College of Medical and Life Science, University of Jinan)
Publication Information
Bulletin of the Korean Chemical Society / v.31, no.5, 2010 , pp. 1349-1354 More about this Journal
Abstract
The geometries and isomerization of the alkylidene silylenoid $H_2C$ = SiLiF as well as its insertion reactions with R-H (R = F, OH, $NH_2$) have been systematically investigated at the B3LYP/6-311+$G^*$ level of theory. The potential barriers of the three insertion reactions are 97.5, 103.3, and 126.1 kJ/mol, respectively. Here, all the mechanisms of the three reactions are identical to each other, i.e., an intermediate has been formed first during the insertion reaction. Then, the intermediate could dissociate into the substituted silylene ($H_2C$ = SiHR) and LiF with a barrier corresponding to their respective dissociation energies. Correspondingly, the reaction energies for the three reactions are -36.4, -24.3, and 3.7 kJ/mol, respectively. Compared with the insertion reaction of $H_2C$ = Si: and R-H (R = F, OH and $NH_2$), the introduction of LiF makes the insertion reaction occur more easily. Furthermore, the effects of halogen (F, Cl, Br) substitution and inorganic salts employed on the reaction activity have also been discussed. As a result, the relative reactivity among the three insertion reactions should be as follows: H-F > H-OH > H-$NH_2$.
Keywords
Alkylidene silylenoid ($H_2C$ = SiLiF); Insertion reaction; Density functional theory (DFT);
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