N-[1-(ACYLOXY)ALKYL]HETEROARYLIUM SALTS IN SYNTHESIS .3. INTRAMOLECULAR ORTHO-ACYLATION OF SOME N-HETEROAROMATIC RING-SYSTEMS - Anders, Ernst; Boldt, Hans-Günter; Clark, Timothy; Gassner, Thomas; et al. (Chemische Berichte, 1986)