Entry | Catalyst 4 (mol%) | GC-yield %a,b
|
---|
1 | 1 | 100 |
2 | 0.75 | 100 |
3 | 0.50 | 100 |
4 | 0.25 | 100 (96) |
5 | 0.125 | 100 |
6 | 0.05 | 100 |
7 | 0.025 | 100 |
8 | 0.005 | 87 |
9 | 0.00 | 0 |
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aConditions: p-Bromoacetophenone/ phenylboronic acid/ TBAB/ base/ water: 1/1.2/ 0.6/ 2 / 5 mL, under thermal heating at 100–110 °C for 2 h
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bConversions were based on GC-analysis and the values between parenthesis refer to the isolated yields