Spin Delocalization by Triple-Bonded Functionalities in Propargyl and Heteropropargyl Radicals, Assessed from the EPR-Spectral <i>D</i> Parameter of 1,3-Cyclopentanediyl Triplet Diradicals
作者:Waldemar Adam、Claudio M. Ortega-Schulte
DOI:10.1021/jo026579w
日期:2003.2.1
The cyclopentane-1,3-diyltripletdiradicals T and T' with the triplet-bonded acetylene, cyano, and isocyano functionalities at one of the radical sites are readily prepared from the corresponding azoalkanes by photodenitrogenation in a 2-methyltetrahydrofuran (2-MTHF) matrix at 77 K. The EPR-spectral D values of these tripletdiradicals show that the spindelocalizing ability of the triple-bonded