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. 2018 Jul 6;9(32):6629–6638. doi: 10.1039/c8sc02535e

Table 4. Effect of the para-substituent on the rate of CO2 insertion into (p-R-tBuPCP)NiH.

Inline graphic
Entry (p-R-tBuPCP)NiH k 1 (M–1 s–1) at RT in THF Rate increase σ p + a
1 5 1.6 ± 0.2 — +0.13
2 1 6.8 ± 0.7 4 —
3 4 11.7 ± 1 7 –0.78

aC. D. Ritchie and W. F. Sager, Prog. Phys. Org. Chem., 1964, 2, 323.