Abstract
Abstract Several Mono-, di-, and triradicals stable at ambient conditions have been isolated as pure solids. Diradicals 7, 10 and triradical 11 exist in several stereoisomeric forms due to restricted rotation of aryl groups, Diradical 7 (R=C6Cl5) has been obtained as a 60:40 equilibrated mixture of the meso form (Cs symmetry) and the enantiomeric pair (C2 symmetry). Both diastereoisomers have been separated and the rates of convertions between each other at different temperatures have been measured. For the triradical 11 (R=C6Cl5) two diastereoisomers with C2 and D3 synmetries have also been separated, having a diastereoisomeric ratio of 80:20. The magnetic properties of polyradicals have been studied by e.s.r, and magnetic susceptibility measurements, Triplet and quartet ground states have been found, respectively for diradicals and triradicals irrespective of their symmetries.
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