A compound or ionic species that can donate an electron pair to an acceptor compound.
- In simple additions, the carbonyl compounds can behave as both Lewis acids and Lewis bases depending on what reagents are present.
- In both cases, the ammonia molecule is acting as a Lewis base, donating the pair of electrons required to form the coordinate covalent bond.
1960s: named after G. N. Lewis (see Lewis acid).
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Syllabification: Lew·is base
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