Hammett Modifications
Other equations now exist that refine the original Hammett equation: the Swain-Lupton equation, the Taft equation, the Grunwald-Winstein equation, and the Yukawa-Tsuno equation. An equation that address stereochemistry in aliphatic systems is also known.
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“When a man’s partner is killed he’s supposed to do something about it. It doesn’t make any difference what you thought of him. He was your partner, and you’re supposed to do something about it.”
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