Abstract
Nitrenium ions (R—N—R+) are reactive intermediates which are isoelectronic with carbenes. Like the more familiar carbenes, nitrenium ions have low-energy singlet and triplet states. Recent experiments have been directed at understanding how singlet and triplet nitrenium ions differ in their chemical reactivity. Singlet nitrenium ions typically react rapidly with nucleophiles whereas the triplet nitrenium ions tend to abstract H atoms. Several specific cases are discussed including the parent system, NH2+, and several arylnitrenium ions. Copyright © 1999 John Wiley & Sons, Ltd.
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