Thioxopyrimidine in Heterocyclic Synthesis III: Synthesis and Properties of Some Novel Heterocyclic Chalcone Derivatives Containing a Thieno[2,3-d]pyrimidine-Based Chromophore

Table 3

Absorption spectra and dyeing properties of 6-(3-substituted-acryloyl)-5-(1-pyrrolyl)-4-methyl-2-phenyl-thieno[2,3-d]pyrimidine derivatives 6a–n.

Dye	R	Colour on dyed polyester fibers	𝜆max	𝜀×10^4	Δ𝜆max	Light fastness	Sublimation fastness
				(mol^−1 cm^−1)
			(DMF); (nm)
6a		Light yellow	412	6.02	—	5	3-4
6b		Orange	455	1.83	43	1-2	4
6c		Greenish yellow	423	8.43	11	3-4	3-4
6d		Yellow	424	6.24	12	3-4	3-4
6e		Orange	488	3.81	76	2	3
6f		Yellow	456	9.34	44	3-4	5
6g		Yellow	442	6.64	30	2-3	4
6h		Yellow	424	6.23	12	3	4-5
6i		Yellow	478	3.04	66	3-4	4-5
6j		Light yellow	442	4.39	30	1	5
6k		Greenish yellow	440	8.68	28	2	3-4
6l		Yellow	453	1.13	41	2	4-5
6m		Orange yellow	481	7.17	69	3	5
6n		Orange	470	4.09	58	4-5	4-5