M. H. M. Helal

N,N'-(methylenebis(1,4-phenylene))bis-(2-cyanoacetamide) was exploited as a precursor for synthesing some bis (benzylidene 5a-c, pyridines 7, 8, 10a,b, chromene 14, benzochromene 15) derivatives containing diphenyl-methylene spacer via the reaction with each of aromatic aldehydes, pentane-2,4-dione, acetaldehyde/ malononitrile, arylidene-malononitriles, ethyl cinnamates, 2-hydroxybenzaldehyde, and 2-hydroxy-1-naphthaldehyde). Bis(chromeno[3,4-c]pyridines 16&18) were synthesized via Michael's addition of malononitrile or ethyl cyanoacetate to bis(chromene) derivative. The newly prepared compound structures were established via ir, NMR spectroscopic data.