.alpha.,.beta.-Unsaturated aldehydes and ketones are prepared by reaction of an arylseleninic anhydride with an aldehyde or ketone having at least one hydrogen atom in the .alpha.-position which is or can be in the syn-configuration with respect to at least one hydrogen atom in the said .beta.-position. The ketones used as starting material especially include perhydrophenanthrene ketones such as steroid ketones and the arylseleninic anhydride used may for example be benzeneseleninic anhydride.
通过芳基
硒酰
苯酐与至少在.alpha.-位具有一个氢原子的醛或酮反应制备.α.,.β.-不饱和醛和酮,该氢原子是或可以与所述.β.-位至少一个氢原子处于同构构象。作为起始材料使用的酮特别包括类
固醇酮等类似萜酮,而用作芳基
硒酰
苯酐的例子可能是苯
硒酰
苯酐。