Table 2.
BDE [kcal mol−1] |
Substrate→Product |
TON[a] 2 a‐PF6/2 a‐OTf |
TON[a] 2 b‐PF6/2 b‐OTf |
---|---|---|---|
75 |
XEN→XON |
1/3 |
1/2 |
78 |
DHA→A |
3/2 |
2/1 |
78 |
DHA→AQ[b] |
3/2 |
4/5 |
82 |
DPM→Ph2CO |
2/2 |
2/2 |
General remarks: Conditions: 1 equiv of 2 a or 2 b and 20, 10 or 50 equiv of XEN, DHA or DPM, respectively, were applied (cf. Section S2.8). Blind reactions were also performed using [Cu(CH3CN)4]PF6 or [Cu(CH3CN)4]OTf and O2 instead of 2 a or 2 b. All control experiments lead to poorer results compared to the activity with 2 a or 2 b (see Table S17). For abbreviations see text. [a] TON=Turnover Number; is defined as the equiv of product made per equiv of catalyst (=Cu2O complex). [b] 10 equiv of DHA were used; representing 20‐fold excess of substrate. The given TON refers to the initially formed disecondary alcohol and does not include the subsequent oxidation.