| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| 5-[双(甲基硫代)亚甲基]-2,2-二甲基-1,3-二噁烷-4,6-二酮 | 5-[bis(methylthio)methylene]-2,2-dimethyl-1,3-dioxane-4,6-dione | 100981-05-3 | C9H12O4S2 | 248.324 |
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.