کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5418317 | 1506987 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ab initio study on the mechanism of forming a silapolycyclic compound between silylidene and formaldehyde
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The mechanism of the cycloaddition reaction of forming a silapolycyclic compound between singlet silylidene and formaldehyde has been investigated with MP2/6-31G* method, including geometry optimization and vibrational analysis for the involved stationary points on the potential energy surface. The energies of the different conformations are calculated by CCSD(T)//MP2/6-31G* method. From the potential energy profile, it can be predicted that the cycloaddition reaction process of forming the silapolycyclic compound (P2) for this reaction consists of four steps: (I) the two reactants first form a semi-cyclic intermediate INT1a through a barrier-free exothermic reaction of 32.5Â kJÂ molâ1; (II) this intermediate then isomerizes to an active four-membered ring intermediate INT1 via a transition state TS1a with an energy barrier of 30.8Â kJÂ molâ1; (III) INT1 further reacts with formaldehyde to form an intermediate INT2, which is also a barrier-free exothermic reaction of 30.1Â kJÂ molâ1; (IV) INT2 isomerizes to a silapolycyclic compound P2 via a transition state TS2 with a barrier of 50.6Â kJÂ molâ1. Comparing this reaction path with other competitive reaction paths, we can see that this cycloaddition reaction has an excellent selectivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 770, Issues 1â3, 29 September 2006, Pages 185-191
Journal: Journal of Molecular Structure: THEOCHEM - Volume 770, Issues 1â3, 29 September 2006, Pages 185-191
نویسندگان
Xiuhui Lu, Haibin Yu, Yuehua Xu, Pingping Xiang, Yandi Liu,