Results from van't Hoff analysis of variable-temperature spectroscopic measurements of 5a–5c under N2.
| Alkyl group | ΔH (kcal mol−1) | ΔS (e.u.) | |
|---|---|---|---|
| 5a | CH2SiMe3 | −8.8(6) | −52(3) |
| 5b | CH2Ph | −9.5(6) | −57(2) |
| 5c | CH3 | −4.3(7) | −33(3) |
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