Table 1.

Structure and molar weight of the investigated compounds 1–28.

Number	R	Mol. Weight (g/mol)
1	Phenyl	295.40
2	4-Methoxyphenyl	325.43
3	4-Methylphenyl	309.43
4	4-Chlorophenyl	329.85
5	Benzoyl	323.41
6	3,4-Dichlorophenyl	364.29
7	3-Bromophenyl	374.30
8	4-Bromophenyl	374.30
9	Cyclohexyl	301.45
10	Benzyl	309.43
11	2-Fluorophenyl	313.39
12	3-Fluorophenyl	313.39
13	2-Chlorophenyl	329.85
14	3-Chlorophenyl	329.85
15	2-Bromophenyl	374.30
16	Phenethyl	323.46
17	4-Fluorophenyl	313.39
18	Allyl	259.37
19	Methallyl	273.40
20	Ethoxycarbonyl	291.37
21	4-Iodophenyl	421.30
22	Ethyl	247.36
23	3-Chloro-4-methylphenyl	343.87
24	3-Trifluoromethylphenyl	363.40
25	Methyl	233.33
26	3-Chloro-6-methylphenyl	343.87
27	4-Butyl-2-methylphenyl	365.53
28	3-Chloro-4-fluorophenyl	347.84