| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| 2,4-二硝基苯肼 | (2,4-dinitro-phenyl)-hydrazine | 119-26-6 | C6H6N4O4 | 198.138 |
The configuration and conformation of the isomeric enol acetates of acetylacetone have been elucidated. P.m.r. shift data obtained by the use of tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato)europium(III) (Eu(fod)3) allow assignment of the (S)-cis conformation to both isomers. The remarkable stability of the isomer having acetyl cis to acetoxy is attributed to neighboring group interaction, a rationale consistent with p.m.r. spectroscopic data.