Stable C-92(26) and C-92(38) as Well as Unstable C-92(50) and C-92(23) Isolated-Pentagon-Rule Isomers As Revealed by Chlorination of C-92 Fullerene

摘要

High-temperature chlorination of C-92 fractions, followed by single-crystal X-ray diffraction, resulted in the structure determination of C-92(38)Cl-18, C-92(38 )Cl-22, C-92(26)Cl-24, nonclassical C-90(NC)Cl-22, and non-isolated-pentagon-rule C90Cl26. Two latter chloro derivatives were obtained by chlorination-promoted cage transformations via a single C-2 loss from C-92(50) and a combination of a C-2 loss from C-92(23) and three Stone-Wales rearrangements. The chlorination patterns are stabilized by the formation of isolated C=C bonds and aromatic substructures on carbon cages. The presence of C(92 )isomer numbers 23, 26, and 50 in the arc-discharge fullerene soot has been confirmed for the first time.