Tetrabutylammonium iodide is a very efficient catalyst for the cyclization of unsaturated N-chloroamines. The catalysis seems to proceed through N-iodoamine intermediates, which act as a source of iodonium ions. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)
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Noack et al. (2002) studied this question.