Benjamin J. S. Wang, Edward R. Thornton
Mass spectral mechanisms. N-Alkyl-3-cyano-1,4-dihydropyridine fragmentation. Kinetic isotope effects for expulsion of deuterium from the 4 position and transition from quantal to purely classical isotope effect
J. Am. Chem. Soc., 1968, 90 (5), pp 1216–1224
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http://www.dx.doi.org/10.1021/ja01007a019