Table 5.

Hydrogenation of phenyl acetylene in the presence of the dendrimer‐based organo‐silica palladium catalysts.^[a]

Entry	Catalyst	d, nm	DM, %[b]	$\frac{P{d}^0+Pd/Pd{O}_x}{PdO+P{d}^{2+}}$	Substrate/Pd, (mol/mol)	P (H2), atm.	Conv., %	TOF, h−1	Selectivity on styrene, %
1	G3‐dendr‐SiO2‐Pd	2.81±0.71	31.5	1.2	7230	10	99.5	28780	90.5
2					14455	10	77	44545	98
3					14455	30	97	56115	95
4					18070	30	82	59300	97
5					21680	10	57	49465	98
6					21680	30	79	68555	98
7					28910	10	47	54380	98
8					28910	40	70	80995	96
9	G2‐dendr‐meso‐SiO2‐Pd	3.29±0.34	26.9 %	4.4	6390	10	98	25055	67
10					12785	10	63	32215	95.5
11					12785	30	98	50115	84
12					15980	30	90	57530	90.5
13					19175	10	45.5	34900	96.5
14					19175	30	75	57530	92
15	meso‐G2‐dendr‐Si‐Pd	2.71±0.44	32.6 %	2.5	6285	10	73	18350	92
16					12570	10	47	23630	98
17					12570	30	98	49279	87.5
18					18850	30	92.5	69755	91.5
19					25135	10	20.5	20610	98
20					25135	30	53.5	53795	93.5

[a] Reaction conditions are: 0.5 mg of catalyst, 80 °C, 15 min;

[b] Particle dispersity D_M can be calculated according to the formula: $D_M=\frac{0.885}{d}$ ,2g where d is mean particle diameter, expressed in nm, and 0.885 is a Pd reduced factor, corresponding to the ratio of the atomic phase volume v_M to the average atomic effective area a_M on the particle surface.61 It can be calculated according to the formula: $\frac{{\nu }_M}{a_M}=\frac{A_r}{N_a*\rho *a_M}$ .