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Hammett substituent coefficient (σ) and the van der Waal volume of terminal X for compounds A–D.
| Compound | van der Waal Volume | Hammett Substituent Coefficient (σ) | Inductive Sigma Constant (I) |
|---|---|---|---|
| A | 44.34 | −0.14 | −0.03 |
| B | 3.50 | 0.00 | 0.00 |
| C | 19.64 | 0.30 | 0.39 |
| D | 5.80 | 0.06 | 0.52 |
