Table 1.

Physicochemical data of synthesised compounds.

Comp.	R	Colour (state)	% Yield	MP (°C)	Rf a
3a	Ethyl	Colourless (solid)	78	112–114	0.70
3b	Propyl	Colourless (solid)	74	118–122	0.72
3c	Butyl	Brown (semi-solid)	69	–	0.74
3d	Pentyl	Brown (semi-solid)	66	–	0.74
3e	1-Formyl-but-4-yl	Brown (semi-solid)	65	–	0.67
3′a	Phenyl	Colourless (solid)	72	122–124	0.72
3′b	2-Hydroxyphenyl	Off-white (solid)	83	128–130	0.76
3′c	3-Methoxyphenyl	Pale yellow (solid)	74	145–147	0.72
3′d	4-Chlorophenyl	Colourless (solid)	84	136–140	0.74
3′e	4-Nitrophenyl	Yellow (solid)	80	156–158	0.72
3′f	4-Tolyl	Colourless (solid)	69	142–144	0.78
3′g	4-Bromophenyl	Brown (semi-solid)	68	–	0.68
3′h	4-Fluorophenyl	Brown (semi-solid)	66	–	0.68
3′i	1-Naphthyl	Brown (semi-solid)	70	–	0.70
3′j	4-Dimethylaminophenyl	Pale yellow (solid)	78	168–170	0.72
3′k	3-Cinnamyl	Yellow (solid)	65	–	0.66
3′l	4-Hydroxy-3-methoxyphenyl	Colourless (solid)	82	148–150	0.76
3′m	3,4-Dimethoxyphenyl	Colourless (solid)	76	128–130	0.74
3′n	Isophthalyl	Colourless (solid)	69	134–136	0.79
3″a	Furan-2-yl	Dark brown (semi-solid)	68	–	0.65
3″b	Thiophen-2-yl	Light brown (semi-solid)	66	–	0.66
3″c	Pyrrole-2-yl	Light yellow (solid)	64	145–147	0.67
3″d	Indole-3-yl	Colourless (solid)	75	157–160	0.74
3″e	Pyridin-4-yl	Brown (semi-solid)	68	–	0.68

^aCyclohexane:EtOAc:acetic acid (1:2:0.5).