Abstract The X-ray crystal structures of 1,3-diphenyl-2-methylpropane-1,3-dione and 1,3-diphenyl-2-(4-methoxyphenyl)propane-1,3-dione show them both to adopt cis -diketo (Z,Z) conformations with carbonyl—carbonyl dihedral angles of 89.0(3)° (2-methyl derivative), and 85.5(4)° and 77.7(4)° for the two molecules in the asymmetric unit of the 2-(4-methoxyphenyl) derivative. These are the first acyclic
摘要 1,3
-二苯基-2-甲基
丙烷-1,3-二酮和1,3
-二苯基-2-(4-
甲氧基苯基)
丙烷-1,3-二酮的X射线晶体结构表明它们均采用顺式-二酮(Z,Z)构象,羰基-羰基二面角为 89.0(3)°(2-甲基衍
生物),2 的不对称单元中的两个分子为 85.5(4)° 和 77.7(4)° -(4-
甲氧基苯基)衍
生物。这些是第一个报道的带有 α-氢的无环
β-二酮,它们在固态下没有烯醇构型。