The Benzannelated Annulenones. Syntheses and Properties of 10-Methylbenzo[<i>d</i>]- and Dibenzo[<i>d</i>,<i>j</i>]-6,8-bisdehydro[13]annuIenone
作者:J\={u}ro Ojima、Y\={o}ji Yokoyama、Michiko Enkaku
DOI:10.1246/bcsj.50.1522
日期:1977.6
The dibenzannelated annulenone (IX) and its precursor (VIII) were converted into the corresponding alcohols or ethers (XIIa, XIIb and XIa, XIb), respectively, to test the presence of the paratropic nature of IX. The NMR spectra of XIa, XIb and XIIa, XIIb, in addition to those of VIII and IX, suggested that IX seemed to be weakly paratropic. An attempt made to prepare the dibenzannelat...
为了检查由羰基极化引起的十三元环系统预期的旁向性质,分别通过适当的醛和适当的醛醇缩合反应制备了两个苯甲酰化的双脱氢 [13] 环烯酮 VI 和 IX。酮,然后氧化偶联得到的含有末端乙炔基的无环酮。NMR谱表明,VI和IX以及各自的质子化物质VII和X都是反亲性的,并且随着稠合苯环数量的增加,反亲性在VI>IX的序列中降低。将二苄基化的环烯酮 (IX) 及其前体 (VIII) 分别转化为相应的醇或醚 (XIIa、XIIb 和 XIa、XIb),以测试 IX 的副亲性的存在。XIa、XIb 和XIIa、XIIb 的NMR 谱,除了VIII 和IX 的NMR 谱外,表明IX 似乎是弱副向性的。试图制备 dibenzannelat ......