The bicyclic amidines (1)–(4) have been found to be α-chlorinated with carbon tetrachloride at room temperature in darkness under nitrogen, (1) and (3) also undergo 1H–2H exchange in the α-position with [2H]-chloroform.
S. Löfås and P. Ahlberg, J. Chem. Soc., Chem. Commun., 1981, 998 DOI: 10.1039/C39810000998
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