Dossier: Special Issue in Tribute to Yves Chauvin
Open Access

Table 4

Initial activity and conversion of the MoO2(acac)2/AlEt3/ZOH for 4-decyne metathesis

Entry Co-catalyst pKa TOF (h−1) Conversion (%)
1 2,3,4,5,6-F5-ArOH 5.35 0 -
2 3,4-Cl2-ArOH 8.5 53 26
3 Resorcinola 9.1 0 -
4 2-F-ArOH 8.7 76 26
5 3-Cl-ArOH 8.9 59 33
6 4-Cl-ArOH 9.3 56 30.5
7 ArOH 9.9 22 19
8 2,6-(CH3)2-ArOH 10.6 0 -
9 (C6H5)3SiOH ~ 12b 12.5 5.0
10 (C6H5)2Si(OH)2 a ~ 12b 0 -
11 (CF3)(CH3)2COH 11.8 0 -
12 (CF3)CH2OH 12.5 0 -

Conditions: T = 20°C, solvent: toluene; [C≡C]/[phenol or silanol] = 1; [C≡C]/[Mo] = 100; [AlEt3]/[Mo] = 6.

a

Insoluble in toluene.

b

Estimated value of the pKa.

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