Synthesis of 1,3-diazepines and ring contraction to cyanopyrrolesDiazepines. Part 2. For Part 1 see ref. 1.Electronic supplementary information (ESI) available: drawings of the crystal structures of compounds 6T and 9Tb (ORTEP); bond lengths and angles for compounds 6T, 9Tb, 25h and 28, and 15N NMR spectra of 21, 30, 27 and 37. See http://www.rsc.org/suppdata/ob/b3/b311247k/
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