Styrylpyrylium Salts: ¹H and ¹³C NMR High-Resolution Spectroscopy (1D and 2D)

Table 3

Gap of chemical shifts of styryl group and pyrylium ring carbons for compounds 1, 2, 3 and 4.

	𝛿 in ppm as compared to non substituted compounds
	C2	C3^∗	C4	C5	C6	C7	C8
𝛿 (2)-𝛿 (1)	−1.69	14.17	0.38	−2.15	0.09	−2.59	0.55
𝛿 (4)-𝛿 (3)	0.34	14.10	4.25	1.41	−0.55	2.15	0.60

* Substituted carbon.