作者:Michael Davis、Alex W. White
DOI:10.1039/j39690002189
日期:——
under conditions in which Br+ is the electrophilic species gives a mixture of 5- and 7-bromo-2,1-benzisothiazole, together with a smaller quantity of 4,7-dibromo-2,1-benzisothiazole. Nitration of 2,1-benzisothiazole affords mainly 5-nitro-2,1-benzisothiazole with smaller quantities of the 7-nitro- and 4-nitro-isomers. Nitration of monosubstituted 2,1-benzisothiazoles gives products which indicate that
在Br +为亲电子物质的条件下,溴化2,1-苯并噻唑(I)可得到5-和7-溴-2,1-苯并噻唑的混合物,以及更少量的4,7-二溴-2 ,1-苯并噻唑。2,1-苯并噻唑的硝化主要产生5-硝基-2,1-苯并噻唑和少量的7-硝基和4-硝基异构体。单取代的2,1-苯并噻唑的硝化产生的产物表明,已经存在于苯环中的取代基是决定性的指导作用。