中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
丙二酸环(亚)异丙酯 | cycl-isopropylidene malonate | 2033-24-1 | C6H8O4 | 144.127 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
5,5-二溴-2,2-二甲基-4,6-二酮-1,3-二氧杂环己烷 | 2,2-dimethyl-5,5-dibromo-1,3-dioxane-4,6-dione | 66131-14-4 | C6H6Br2O4 | 301.919 |
丙二酸环(亚)异丙酯 | cycl-isopropylidene malonate | 2033-24-1 | C6H8O4 | 144.127 |
甲基丙二酸亚异丙酯 | 2,2,5-trimethyl-1,3-dioxane-4,6-dione | 3709-18-0 | C7H10O4 | 158.154 |
The ylides Ph3E‐C6H6O4 [
Diisopropylidene ethylenetetracarboxylate, Meldrum’s olefin (4, Mel2) has been prepared from [HNEt3][(Mel)2CSMe] (8) and Meldrum’s acid (1, MelH2) in moderate yield. The X-ray analysis of 4 reveals a centrosymmetrical structure in which the two six-membered rings are folded along their carboxylate carbon axes by 34.9°) and linked by a conventional C-C double bond [1.3501(19) Å ]. The “unsymmetrical” structure of 8 is also discussed.
从[HNEt3][(Mel)2CSMe] (8)和Meldrum's acid (1, MelH2)中制备了双异丙基亚乙烯四羧酸酯,即Meldrum's olefin (4, Mel2),收率中等。 4的X射线分析揭示了一个中心对称的结构,其中两个六元环沿其羧酸碳轴折叠34.9°,并通过传统的C-C双键[1.3501(19)Å]连接。还讨论了8的“非对称”结构。