Table 2.

Comparison of the methods of synthesis of imidazolines based on reactions of benzaldehyde and ethylenediamine.

Entry	Reagent	Solvent	Temp. (oC)	Time (min)	Yields (%)	Ref.
1	H2O2, NaI, MgSO4	t-BuOH	80	30	96	Bai et al., (2011)
2	K4Fe(CN)6	H2O	r.t	30	85	Shaikh et al. (2012)
3	a HPW, b TBAB	H2O	80	120	93	Liu et al. (2019)
4	c NBS	dry TBME or CH2Cl2	0	30	99	Fujioka et al. (2007)
5	I2/KI/K2CO3	H2O	90	30	90	Gogoi and Konwar, 2006
6	I2,K2CO3	t-BuOH	70	180	100	Ishihara and Togo (2007a)
7	d CAN	Dry-CH2Cl2	Reflux	15	90	Kumar and Joshi (2007)
8	NBS	H2O	65–70	12	99	Sant’ Anna et al., 2009
9	NBSac	CH2Cl2	r.t	20	96	This work

^aTungstophosphoric acid.

^bTetrabutylammonium bromide.

^cN-bromosuccinimide.

^dCeric ammonium nitrate.