Postsynthetic Modification of Dicarbene-Derived Metallacycles via Photochemical [2 + 2] Cycloaddition
作者:Ying-Feng Han、Guo-Xin Jin、F. Ekkehardt Hahn
DOI:10.1021/ja4032067
日期:2013.6.26
Molecular squares obtained from two olefin-bridged bis(NHC) ligands, NHC-Ar-C=C-Ar-NHC, and two Ag+ or Au+ ions undergo postsynthetic modifications via a UV-irradiation-initiated [2 + 2] cycloaddition reaction to yield the corresponding cyclobutane-bridged dinuclear tetrakis(NHC) complexes. The tetrakis(NHC) ligand can be liberated from the Ag-I complexes as the tetraimidazolium salt. For the Au-I complexes, the substituents at N3 and N3' of the dicarbene ligands determine the outcome of the reaction in the solid state.