A logical precursor of macrocycle C H , cyclophane C H (CO) (1) represents a building block in a possible total synthesis of C . In Fourier transform ion cyclotron resonance laser desorption mass spectroscopic experiments in the negative-ion mode, 1 fragments to C H (2) under successive loss of CO. Further loss of six H atoms and rearrangement gives C ions with a fullerenic structure.
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