Regioselective Friedel-Crafts acylation of 1,2,3,4-tetrahydroquinoline and related nitrogen heterocycles: Effects of NH protective groups and ring size
J. Chem. Soc. Perkin Trans. 1 (1992) N 24, S 3401-3406
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http://dx.doi.org/10.1039/p19920003401