... (1) Greene, TW; Wuts, PGM Protective group in organic synthesis, 2nd ed.; Wiley: New York, 1991. (2) Zemlicka, J. Collect. ... (20) Patai, S. In The chemistry of functional groups: The chemistry of amidines and imidates; Patai, S., Ed.; Wiley: London, 1975; Vol. ... Scheme 1 992 J. Org. ...