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By R Alan Jones; Gerritt P Bean

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If 4,5,6,7-tetrahydroindole needs to be synthesized, its further vinylation can be slowed down, by increasing the content of water in DMSO up to 3%. 19). The yield of chromatographically pure N-vinyl-4,5-dihydrobenz[g]indole is more than 70%. 18 One-pot synthesis of N-4,5,6,7-vinyltetrahydroindole and its vinyl derivative from cyclohexanone, hydroxylamine, and acetylene in the KOH/DMSO system. 19 One-pot synthesis of N-vinyl-4,5-dihydrobenzo[g]indole from 1-tetralone and acetylene in the system NH2OH·HCl/KOH/DMSO.

2 (Continued) Pyrroles Obtained from Ketoximes No. 2 (Continued) Pyrroles Obtained from Ketoximes No. 2 (Continued) Pyrroles Obtained from Ketoximes No. 5880 [247] No. 2 (Continued) Pyrroles Obtained from Ketoximes No. 3 N-Vinylpyrroles Obtained from Ketoximes No. 5160 [185–187] 83 63/2 0. 3 (Continued) N-Vinylpyrroles Obtained from Ketoximes No. 3 (Continued) N-Vinylpyrroles Obtained from Ketoximes No. 3 (Continued) N-Vinylpyrroles Obtained from Ketoximes Structure Yield (%) Bp, °C/torr (Mp, °C) d 420 nD20 References 1 2 3 4 5 6 7 23 Me Me No.

5 h (120°C) for its N-vinyl derivative. If 4,5,6,7-tetrahydroindole needs to be synthesized, its further vinylation can be slowed down, by increasing the content of water in DMSO up to 3%. 19). The yield of chromatographically pure N-vinyl-4,5-dihydrobenz[g]indole is more than 70%. 18 One-pot synthesis of N-4,5,6,7-vinyltetrahydroindole and its vinyl derivative from cyclohexanone, hydroxylamine, and acetylene in the KOH/DMSO system. 19 One-pot synthesis of N-vinyl-4,5-dihydrobenzo[g]indole from 1-tetralone and acetylene in the system NH2OH·HCl/KOH/DMSO.

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