| 查看: 275 | 回复: 0 | ||
[求助]
求帮忙翻译文献摘要
|
|
Formation of Allenyl Ketones, 3‑Ethynylcoumarins, and Arylfurans, Furylfurans, and Furylthiophenes by Flash Vacuum Thermolysis of 3‑Methylidenefuran-2(3H)‑ones ABSTRACT: Flash vacuum thermolysis (FVT) of 3-methylidenefuran-2(3H)- ones 3 causes cheletropic extrusion of CO with formation of allenyl ketones 4. o-Chloro- and o-bromophenylmethylidenefuranones also afford allenyl ketones upon flash vacuum thermolysis, but in addition, 3-ethynylcoumarins 6 are formed via E/Z isomerization of the methylidenefuranones, cyclization, halogen atom migration, and HCl (HBr) elimination. The presence of strongly electron-withdrawing groups (nitroaryl or acetyl) on the acylallene moiety causes rearrangement to give 2-arylfurans 10 and 13 as well as 2- furylfurans and 2-furylthiophenes 16 by cyclization of the allenyl ketones. The reaction mechanisms are supported by calculations at the M06-2X/6- 311+G(d,p) level of theory. |
回复此楼» 猜你喜欢
0703调剂，一志愿天津大学319分
已经有14人回复
-
085600材料与化工301分求调剂院校
已经有16人回复
-
一志愿211，0703化学305分求调剂
已经有4人回复
-
机械专硕274求调剂，不挑专业学校
已经有8人回复
-
312求调剂
已经有13人回复
-
生物与医药求调剂
已经有7人回复
-
284求调剂
已经有5人回复
-
一志愿北交大材料工程总分358求调剂
已经有10人回复
-
一志愿南科大生物学297分，求调剂推荐
已经有4人回复
-
材料调剂
已经有4人回复
