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lifeiseasy
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I'm studying the reaction mechanisms for carboxylic acid and its derivatives and here it says whether a compound with a C=O bond undergoes nucleophilic addition (as in aldehydes and ketones) or nucleophilic acyl substitution depends on the relative basicities of the substituent group. For instance, it's very difficult for an aldehyde to eject a H- (hydride) ion because it's a powerful base. But what does it mean by that? Is it talking about Lewis bases?