Verkronte‐Fullerene

Crowned Fullerenes C60 reacts with [15]crown‐5‐substituted diphenylcarbene precursors to give the corresponding benzo‐crowned methano‐fullerenes 7, which were isolated preparatively and characterized. Two isomers 7a and 7b, which equilibrate to 7a upon heating, were detected by HPCL and separated. The [15]crown‐5‐, [18]crown‐6‐, and bis[15]crown‐5‐substituted hydrazones 3b—d have been prepared. The X‐ray structure analysis of the crowned hydrazone 3b shows distinct hydrogen bonding patterns between NH‐ and crown oxygen atoms in dimer‐type arrangements.