Table 6.

Comparison of the catalytic activity of cooper-carbon catalysts with others heterogeneous copper-based catalytic systems.

Entry	Catalyst	Time (h)	Cat. loading (mol %)	Temperature/solvent	Number of cycle	Yield (%)	Reference
1	Cu-CC	6	1	r.t./water	10	98	This work
2	Cu-CANS	6	1	r.t./water	10	98
3	Cu/C	48	10	23°C/dioxane	–	65	Lipshutz and Taft, 2006
4	Cu2O/C	2	5	r.t./i-PrOH:H2O	3	82	López-Ruiz et al., 2012
5	TRGO/Cu	48	2	40°C/THF	4	99	Shaygan Nia et al., 2014
6	Cu-Alginate	18	21	r.t./water	3	98	Rajender Reddy et al., 2007
7	Cu-Chitosan	6	10	r.t./water	5	90	Anil Kumar et al., 2015
8	Cu-Hydroxyappatite	16	5	50°C/water	8	95	Masuyama et al., 2011
9	Cu-zeolite	15	10	r.t./toluene	5	83	Chassaing et al., 2007