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|Type:||Artigo de periódico|
|Title:||The Sn Mechanism In Aromatic Compounds. Part Xl. Activating Effects Of Groups Attached To The Ring By A Sulphur Atom|
|Abstract:||Kinetic data are presented for the alkaline methanolysis of a series of 4-substituted fluorobenzenes, in which the substituents are joined to the ring through sulphur, viz. SMe, SPh, SCF3, SOMe, SO2Me, SO 2Ph, and SO2CF3. The Hammett substituent constants (σ-) estimated at 100° are: 0.27; 0.36; 0.66; 0.77; 1.00: 1.04; 1.40. These are compared with values for COMe, NO, and NO 2 groups. It is suggested that in the sequence of saturated groups SCH3 to SCF3, a small conjugative effect becomes evident. The possibility of a favourable polarizability effect is also considered. The ability of SR groups to activate both SE and SNAr reactions is discussed and brief comparison made with OR groups.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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