Table 2.
Complex | 4-R | σPa | YH (%)b PhCHO | YR (%)b 4-R-PhCHO | YR/YHc | YR/YHd | log (YR/YH) |
---|---|---|---|---|---|---|---|
2 | Cl | 0.23 | 24(2) | 31(4) | 1.26 (7) | 0.10 (3) | |
3 | F | 0.06 | 28(2) | 32(1) | 1.16 (8) | 1.22 | 0.06 (3) |
4 | CH3 | -0.17 | 34(1) | 29(2) | 0.85 (6) | -0.07 (3) | |
5 | t-Bu | -0.20 | 33(1) | 24(3) | 0.78 (5) | 0.79 | -0.11 (3) |
6 | OCH3 | -0.27 | 34(4) | 25(2) | 0.74 (10) | -0.13 (6) |
Hansch, C.; Leo, A.; Taft, R. W. Chem. Rev. 1991, 91, 165-195.
YH and YR represent the product yields of PhCHO and 4-R-PhCHO, respectively.
Ratios were determined from GC analytical data.
Ratios were determined by using 1H NMR spectroscopy.