1. Concave Reagents 2: , Liebigs Ann. Chem. 1989, 367.
2. Concave Reagents 1: Liebigs Ann. Chem. 1987, 949.
3. Synthesis of some 2,9-disubstituted-1,10-phenanthrolines
4. For a five-step synthesis of 2,6-pyridinedicarbaldehyde (1a) from 2,6-dimethylpyridine (0. 13) (overall yield 10%) see also: , J. Chem. Soc., Dalton Trans 1987, 2289.
5. 5a) , Reaktionen und Synthesen im Organisch-Chemischen Praktikum, p. 327, Thieme, Stuttgart — New York 1981.