C61Br2: a new synthesis of dibromomethanofullerene and mass spectrometric evidence of the carbon allotropes C121 and C122

Abstract

The new preparative synthesis and the characterization of 1′,1′-dibromo-1,2-methano[60]fullerene 1a using a Seyferth reagent and the mass spectrometric evidence of the novel dumb-bell shaped molecular carbon allotropes C₁₂₁ 2 and C₁₂₂ 3 obtained via a proposed intermediate C₆₀C: carbene generated from 1a are reported.