Antioxidant Properties of Curcumin Analogues to Inhibit Thermal Degradation of Low-Density Polyethylene: Experimental and DFT Study

Table 1

Synthesis of curcumins 1–8 based on Scheme 1.

Compound	R^1	R^2	R^3	Ketone unit	Color	Mp (°C)	Lit. Mp (°C)	Yield (%)
1	OH	H	H	B	Yellow	224–226	224–226 [21]	89
2	OH	H	H	C	Yellow	154–156	156 [13]	82
3	H	OH	H	A	Yellow	>300	>300 [16]	60
4	H	OH	H	B	Yellow	>300	>300 [16]	85
5	H	OH	H	C	Orange	244–246	243–245 [16]	86
6	H	OH	OMe	A	Yellow	177–178	178–179 [16]	67
7	H	OH	OMe	B	Yellow	212–214	212–214 [16]	80
8	H	OH	OMe	C	Yellow	100–101	99–100 [16]	74