A green synthesis of 2-phenyl/2-styrylchromones under solvent-free conditions using grinding technique

Figures & data

short-legendScheme 1. Synthesis of flavone and 2-styrylchromone.

Table 1. Physical data of the compounds synthesized.

Compound	R1	R2	R3	Time (min)^a	Melting point (°C)	Literature melting point (°C)	Yield (%)^b
Ia	H	H	H	10	98–100	97 (21)	80
Ib	H	CH3	H	10	121	122 (21)	85
Ic	H	H	OCH3	10	160	157–158 (22)	90
Id	H	CH3	OCH3	10	166–168	170 (23)	95
Ie	OCH3	H	OCH3	10	147	145 (24)	90
If	OCH3	H	H	10	103	103–105 (25)	80
IIa	H	H	H	15	130	131 (26)	75
IIb	H	CH3	H	15	135	137 (27)	80
IIc	H	H	OCH3	15	170	167 (27)	95
IId	H	CH3	OCH3	15	157	160 (27)	85
IIe	OCH3	H	H	15	187	189–190 (28)	90
^aGrinding time.
^bYield after crystallization.