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A Reexamination of the Mechanism of the Biginelli Dihydropyrimidine Synthesis. Support for an N-Acyliminium Ion Intermediate
C. Oliver Kappe
J. Org. Chem., 1997, 62, (21), pp 7201–7204.
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http://pubs.acs.org/cgi-bin/article.cgi/joceah/1997/62/i21/pdf/jo971010u.pdf