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Flow synthesis using gaseous ammonia in a Teflon AF-2400 tube-in-tube reactor: Paal-Knorr pyrrole formation and gas concentration measurement by inline flow titration
Authors:Cranwell Philippa B  O'Brien Matthew  Browne Duncan L  Koos Peter  Polyzos Anastasios  Peña-López Miguel  Ley Steven V
Institution:Whiffen Laboratory, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
Abstract:Using a simple and accessible Teflon AF-2400 based tube-in-tube reactor, a series of pyrroles were synthesised in flow using the Paal-Knorr reaction of 1,4-diketones with gaseous ammonia. An inline flow titration technique allowed measurement of the ammonia concentration and its relationship to residence time and temperature.
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