From the photo-dimer (2a) of 2-acetyl-5-methyl-1,4-benzoquinone, mono- and diacetyl derivatives and 2,6-dimethyl-1,4,5,8,9-pentaacetoxyphenanthrene (3) were prepared. 3 was oxidized to 2,6-dimethyl-1,4,5,8-tetraacetoxy-9,10-phenanthrenequinone (4). The acetoxyl groups of 4 were partly deuterated to assign their 1H NMR signals. A series of chemical conversions of 2a to 4 via 3 unambiguously clarified the regiochemistry of 2a.
从2-乙酰基-5-甲基-1,4-苯醌(2a)的光二聚体出发,制备了单乙酰和
双乙酰衍
生物以及2,6-二甲基-1,4,5,8,9-五乙酰氧基
菲(3)。3被氧化成2,6-二甲基-1,4,5,8-四乙酰氧基-9,10-
菲醌(4)。4中的乙酰氧基团部分
氘代以指定其1H NMR信号。一系列从2a到4通过3的
化学转换明确阐明了2a的区域
化学。