Alkaloid N-Oxides

Abstract1. Naturally occurring alkaloid N-oxides are reviewed.2. Examples of indole alkaloid N-oxides from simple indole bases to complex dimeric alkaloids are given.3. Pyrrolizidine alkaloid N-oxides are listed and their toxicity, metabolism and role in the plant considered.4. A brief account of quinolizidine, piperidine and miscellaneous alkaloid N-oxides, together with nicotine N-oxide and N-oxides from micro-organisms, is given.