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The hydrochlorides of 0-amino ketones 1 a -e (Mannich bases) and 4,5-diazafluorenes 4a -d, which have not yet been deare easily obtained starting compounds for a novel synthesis scribed in literature. Symmetrical terpyridines 3e, 4e are of pyridines. Condensation with the heteroaromatic ketones formed in a one-step reaction of 8, 9 with dimethylmethylen-8, 9, and 10 yields 5,6-dihydro-l,lO-phenanthrolines 3a-d, 13 ammonium chloride in the presence of an ammonia source.

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