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Two of us (MSP and SM) previously reported [S. Morgan, J.E. Jackson, M.S. Platz, J. Am. Chem. Soc. 113 (1991) 2782] that adamantylidene (Ad:) reacts with thiophene to form an ylide which absorbs at 320 nm. It was concluded that Ad: has a lifetime of 2.2 μs in benzene and rather low absolute rate constants of reaction with thiophene and pyridine (1.75×10 6 M −1 s −1 and 1.54×10...
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