Helvetica Chimica Acta p. 620 - 626 (1983)
Update date:2022-08-03
Topics:
Markees, Diether G.
The synthesis of ethyl 4-oxo-1,4-dihydro-1,8-phenanthroline-3-carboxylate (2a) and some other 1,8-phenanthrolines is reported.The ethylation of the above ester yields a thermochromic product 2b and some ethyl 4-ethoxy-1,8-phenanthroline-3-carboxylate (3b).Reexamination of similar ethylations of analogous esters derived from 1,7-phenanthroline and 1,10-phenanthroline indicated formation of the O-ethyl derivative of the former and the N-ethyl derivative of the latter.
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