Dipl.-Chem. Wilfred Franke, Prof. Dr. Helmut Schwarz, Helga Thies, Dr. Jayaraman Chandrasekhar, Prof. Dr. Paul von Ragué Schleyer, Prof. Dr. Warren J. Hehre, Prof. Dr. Martin Saunders and Gray Walker
The non-classical pyramidal cation(4) provides a rational explanation of all the phenomena observed on mass-spectrometic degradation of the cyclopentyl cation (1). On generation from (2a), (2b), (3a), or (3b) (• = 13C), (1) always gives 13C2H4, 13C12CH4, 12C2H4 in the ratio of 10:60:30, i.e. all the C atoms must have become statistically equivalent prior to elimination of ethylene from (1). MINDO/3 calculations show degradation to proceed via the cations (4) and (5).