Synthesis and Conformational Assignment of N-(E)-Stilbenyloxymethylenecarbonyl-Substituted Hydrazones of Acetone and o-(m- and p-) Chloro- (nitro-) benzaldehydes by Means of ¹H and ¹³C NMR Spectroscopy

Table 10

Chemical and physical data of compounds 19-20.

Compound	Formula; Mol. weight	Yield; [%]	M.p.; [°C]	𝑅𝑓 (TLC)	Elemental analyses; Calculated (found)
					C	H	N
19	C19H19N2O2Cl	45	144–6	0.69	66.66 (66.70)	5.55 (5.51)	8.18 (8.03)
	343.15
20	C19H19N3O4	41	186–8	0.89	64.55 (64.40)	5.37 (5.28)	11.89 (11.87)
	353.15