Table 1 Substrate scope of selective hydrogenation of alkynes and alkynols catalyzed by the hollow PdAg-CeO2 heterodimer NCs catalyst and commercial referencesa.

From: Hollow PdAg-CeO2 heterodimer nanocrystals as highly structured heterogeneous catalysts

View full size image

#

Catalyst

R1

R2

Time, h

Conv, %

Sel. A, % (cis %)

Sel.B %

1

PdAg-CeO2

CH3(CH2)5

H

2

100

92 (2)

6

2

PdAg-CeO2

CH3(CH2)4

CH3

2

100

95 (96)

4

3

PdAg-CeO2

CH3(CH2)2

CH3(CH2)2

2

96

99 (94)

1

4

PdAg-CeO2

CH3(CH2)2

CH3(CH2)2

5

100

98 (91)

2

5

PdAg-CeO2

CH3(CH2)2

CH3(CH2)2

20

100

95 (85)

5

6

PdAgc

CH3(CH2)2

CH3(CH2)2

20

13

100 (78)

0

7

CeO2d

CH3(CH2)2

CH3(CH2)2

20

7

79 (88)

21

8

Lindlare

CH3(CH2)2

CH3(CH2)2

2

100

98 (86)

2

9

Lindlare

CH3(CH2)2

CH3(CH2)2

5

100

93 (74)

7

10

Lindlare

CH3(CH2)2

CH3(CH2)2

20

100

79 (63)

21

11

Nanoselectf

CH3(CH2)2

CH3(CH2)2

2

100

0

100

12

PdAg-CeO2

Ph

H

2

74

88

12

13

PdAg-CeO2

Cy = b

H

1

100

96

4

14

PdAg-CeO2

Ph

CH3CH2

16

13

82 (97)

18

15

PdAg-CeO2

Ph

CH2OH

16

62

84 (100)

16

16

PdAg-CeO2

(CH2)3OH

H

1

100

87 (1)

12

  1. aReaction conditions: Substrate (0.33 mmol), cat. (0.032 mol% Pd), 5 ml ethanol, 10 bar H2, 50 °C; b1-ethynylcyclohexene; c0.032 mol % Pd vs. 4-octyne; d0.64 mol% CeO2 vs. 4-octyne (nanopowder, 15–30 nm); e0.032 mol % Pd vs. 4-octyne; fPd Nanoselect, LF-200, 0.032 mol % Pd.
Back to article page