A positively charged polyatomic ion with four organic groups attached to a central nitrogen atom. It is often used as a phase-transfer catalyst in organic synthesis.
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(S)-N-(2-bromo-2-phenylethyl)-4-methylbenzenesulfonamide
2',5'-Xylylazobenzimidazolium benzenesulfonate
2,3-bis (4-chlorophenyl)fumaronitrile
