Table 1.
Rate constants at 298 K for the reaction of TpMoO2(OPh) with PR3 forming TpMoO(OPh)(OPR3).
| TpiPrMoO2(OPh) | TpMe2MoO2(OPh)a | ||
|---|---|---|---|
| Phosphine | logk1b | (Θ-Θst)λ | logk1c |
| PMe3 | −3.058 | 0 | −3.733 |
| PMe2Ph | −2.956 | 0 | −3.605 |
| PEt3 | −3.485 | 3.5 | −3.907 |
| PEt2Ph | −3.555 | 7.5 | 0.658 |
| PBun3 | −3.683 | 7.5 | |
| PMePh2 | −3.830 | 7.5 | 0.508 |
| PEtPh2 | −4.296 | 11.5 | 0.051 |
a
No steric threshold was detected.
b
Activation parameters were taken from reference 5, from which the rate constants were calculated.
c
This work, see the Supporting Information.