Donor-Acceptor Adducts of a 1,3-Disila-2-oxyallyl Zwitterion

作者：Cowley Michael J; Huch Volker; Scheschkewitz David^*

来源：Chemistry - A European Journal, 2014, 20(30): 9221-9224.

DOI：10.1002/chem.201402750

• density functional calculations
• donor-acceptor systems
• silicon
• small molecule activation
• small ring systems

In the presence of a Lewis acid or base, cyclotrisilene cSi(3)Tip(4) (Tip=2,4,6-triisopropylphenyl) reacts with CO to form stable adducts of a 1,3-disila-2-oxyallyl zwitterion. Coordination of an N-heterocyclic carbene (NHC) to one silicon center results in a localized Si=C bond, where-as B(C6F5)(3) bonds to the carbonyl moiety leading to the delocalization of the positive charge over the oxyallyl moiety. Computational analysis of the electronic structure of the Lewis acid adduct reveals a considerable interaction between the two silicon atoms in 1,3-position and thus aromaticity akin to the homocyclopropenium cation.

• 出版日期2014-7-21