Why is $C O_{2}$ $CO_2$ a lewis acid?

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Why is $C O_{2}$ $CO_2$ a lewis acid?

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Answer 1 · 2018-07-13T07:43:31

Is it not an electron pair acceptor....?

Explanation:

Still the best way of making a $C - C$ $C-C$ bond is to pour a Grignard reagent onto dry ice as shown...

$R - M g X + C O_{2} (s) dry ether - --- \to R C O_{2}^{-} + M g X_{2} (s) ⏐ ⏐ ↓$ $R-MgX + CO_2(s) stackrel("dry ether")rarr RCO_2^(-) + MgX_2(s)darr$

The carboxylate ion can be reprotonated by water work-up to give $R C O_{2} H$ $RCO_2H$ ... And here carbon dioxide has accepted the formal pair of electrons conceived to be localized on the Grignard reagent...

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Why is $C O_{2}$ $CO_2$ a lewis acid?

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