Diiodoindium(III) Cation, InI<sub>2</sub><sup>+</sup>, a Potent Yneophile. Generation and Application to Cationic Cyclization by Selective π-Activation of C≡C
作者:Karavadhi Surendra、E. J. Corey
DOI:10.1021/ja506502p
日期:2014.8.6
The removal of the iodide ion from indium triiodide by means of reactive Ag(I) salts leads to the formation of the highly reactive ligandless cation InI2+, which is unusual in having two vacant low-lying p-orbitals. This bivalent Lewis acidity leads to an especially high affinity for the two orthogonal pi-bonds of carbon-carbon triple bonds. Consequently, the double-coordinating InI2+ is an especially effective reagent for the selective activation of C C and the catalytic initiation of cationic cyclization processes. A number of such reactions are described to demonstrate synthetic utility.