TABLE 2.

A comparison of the obtained results with previous published work for the synthesis of internal alkynes.

S.No	Acid	Coupling partner	Catalyst	Conditions	Yield (%)	Ref
1			Pd2dba3 (5 mol%)	dppf (10 mol%), TBAF (6.0 equiv), NMP, 90°C, 1 h	88	Moon et al. (2008b)
2			Pd2dba3 (2 mol%)	PPh3 (16 mol%), Ag2O (1–3 equiv), LiI (3–6 equiv), DMF	64	Kim and Lee, (2009)
3			Pd (OAc)2	XPhos, Cs2CO3, THF, 80°C	70–95	Zhang et al. (2010)
4			Palladacycle (1 mol%)	Xphos (4 mol%), K2CO3 (2 equiv), xylene/H2O 120°C, 3 h	94	Li et al. (2013)
5			Pd (PPh3)2Cl2 (1 mol%)	2 mol% of dppb, DMSO, 110°C, 2 h	96	Moon et al. (2008a)
6			[PdCl (allyl)]2 (2.5 mol%)	SPhos (7.5 mol%), TBAF (3.0 equiv), NMP/H2O, 80°C, 14 h	84	Tartaggia et al. (2012)
7			CuI (10 mol%)	1,10-Phen (10 mol%), Cs2CO3 (1.5 equiv), DMF, 130°C, 24 h	99	Zhao et al. (2010)
8			CuI (2 mol%)	PPh3 (4 mol%), K2CO3 (3 equiv), DMSO/H2O 100°C, 24 h, under argon	97	Li et al. (2012)
9			CuI (0.5 mol%)/Fe (acac)3) (1 equiv)	K3PO4 (2 equiv), DMSO (2 ml), 140°C, 24–48 h, under argon	98	Li et al. (2011)
10			CuSO4·5H2O (10 mol%)	L (10 mol%), K2CO3(2 equiv), DMF, 130°C	90	Wang et al. (2016)
11			Ni (acac)2 (10 mol%)	1,10-Phen (10 mol%), CsF(1 equiv), CuF2(1 Equiv)	90	Edwin Raja et al. (2016)
12 a			Pd-CNT (5 mol%)	DBU (2 equiv.), DMSO, 90°C, 12 h	95	Pyo et al. (2013)
13 a			Pd@PS (3 mol%)	DBU (3 equiv), DMF, 110°C, 12 h	66	Reddy et al. (2016)
14 a			Cu-DF@ ASMNP	Cs2CO3, toluene, 100°C, 12 h	92	This work

^aHeterogeneous catalyst.