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|Type:||Artigo de periódico|
|Title:||The Sn Mechanism In Aromatic Compounds. Part Xxxix. Halogen Mobility And Reagent Strength In Reactions Of Some Heavy Atom Neutral Nucleophiles (thiourea, N-acetylthiourea, And Selenourea) With 1-chloro- And 1-fluoro-2,4-dinitrobenzenes|
|Abstract:||The rates, and some derived parameters, of reaction of three heavy atom neutral nucleophiles (thiourea, N-acetylthiourea, and selenourea) with 1-fluoro- and 1-chloro-2,4-dinitrobenzene are measured and used to estimate (a) the mobilities of fluorine relative to chlorine, an important mechanistic feature of the usual (addition-elimination) SNAr reactions; and (b) the strength of the reagents. Results are compared with those for a range of neutral and anionic light (Periodic Table first row) and heavy atom (Periodic Table second or higher row) nucleophiles. Results for 1-iodo-2,4-dinitrobenzene are included where available. A marked reduction in F:Cl mobility ratios (which are matched by F:heavy halogen ratios), well known in following a sequence from light to heavy atom anionic nucleophiles, is now shown to occur also with neutral nucleophiles.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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