作者:A.T. Balaban、G. Mihai、C.D. Nenitzescu
DOI:10.1016/s0040-4020(01)92659-6
日期:1962.1
Sodium borohydride converts 2,4,6-trialkylpyrylium salts (I) into a mixture of dienones (III) and lower-boiling products, which are probably 4H-pyrans (IV). The latter products yield derivatives of 1,5-diones in acid medium, and are believed to be formed by addition of the hydride ion to the γ-position of the pyrylium salt, while the former dienones arise by addition to the α-position.
硼氢化钠将2,4,6-三烷基吡啶鎓盐(I)转化为二烯酮(III)和低沸点产物的混合物,它们可能是4H-吡喃(IV)。后者的产物在酸性介质中产生1,5-二酮的衍生物,并且据信是通过将氢化物离子加到吡喃鎓盐的γ-位上而形成的,而前者的二烯酮是通过将α-位加成而形成的。