rates. The enol isomer of the fluorinated β-diketones had >90% abundance under the conditions of study and the first order rate constant of enol to keto conversion varied between 220 and 50 000 s−1 depending on solvent (CDCl3 or CD3CN) and R-groups. Thermal analysis (DSC) of 1 and 4 showed no liquid crystalline mesophase behaviour but definite polymorphism was observed. β-diketones 1 and 4 exist as low
含
钌茂
金属的
β-二酮,RcCOCH 2 COR,Rc =
钌茂
金属,R = C 10 F 21(1),CF 3(2),C 6 F 5(3),C 10 H 21(4),CH 3(5)和C 6 H 5(6)是通过适当的甲酯与乙酰
钌茂
金属的克莱森缩合反应合成的,并对其光谱,电
化学和热性能进行了比较。利用1,2,3-苯并三唑-1-yethanone(9)或1,2,3-苯并三唑-1-基(
钌烯基)甲酮(10)而不是常规酯作为反应物,对
β-二酮合成更为有效。新的含
钌茂茂的
β-二酮的表观酸解离常数p K a '为7.14(4)(1,R = C 10 F 21),9.92(3)(3,R = C 6 F 5)和10.06(2)(4,R = C 10 H 21)。
钌烯基基团的最大阳极电势为1-6,p K a '值和FTIRν(CO)前体酯的拉伸频率,RCOOCH 3,与戈迪规模基电负性,线性相关χ - [R ,作为C