Table 1 Catalytic activities of multidentate catalysts consisting of ligands 1a–d.

From: Highly active alkyne metathesis catalysts operating under open air condition

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Entrya

Ligand

Temperature (°C)

Time (h)

Yield (%)b

1

1a

70

0.5

5

2

1b

70

0.5

88

3

1c

70

0.5

62

4

1d

70

0.5

96

5

1d

40

1.5

94

6

1d

22

3

94

  1. a0.1 mmol substrate, 150 mg MS 5 Å, 3.0 mL CCl4, 0.003 mmol precursor, and 0.003 mmol ligand were used.
  2. bThe yields were estimated based on the proton signal integrations in the crude product 1H NMR spectra.
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