Structural Study of the Methylnaphthazarins. X-Ray Structure of the Tetramethylnaphthazarin, a Charge Transfer Complex
摘要:
尝试了甲基取代萘嗪的合成和1H NMR分析。将取代基和环质子的化学位移与其二乙酸酯中的化学位移进行比较,然后与环的醌类或苯类性质相关。四甲基萘醌(2,3,6,7-四甲基-5,8-二羟基-1,4-萘醌)的 X 射线衍射分析表明,它以固态形式存在,作为与其自身中心对称的电荷转移络合物。该化合物在 Ibam 空间群中结晶,具有尺寸为 a=17.479(1)、b=9.983(1)、c=6.752(1) Å 的斜方晶胞,晶胞中有四个分子。该晶体由沿 c 轴堆叠的分子构成,两个重叠分子之间的晶面距离为 3.38 Å。
We report the synthesis of derivatives of vitamin K3 as well as of vitaminsK1 and K2 containing a different number of methyl groups in various positions in order to reduce their redox potentials and to change systematically their steric features. The long aliphatic chain of vitaminsK1 and K2 is simulated by an undecyl chain or a methyl group, respectively. The redox potentials of the first reduction