HALOGEN MIGRATION AND ELIMINATION IN THE CLAISEN REARRANGEMENT OF ALLYL 2,6-DIHALOPHENYL ETHERS
作者:E. Piers、R. K. Brown
DOI:10.1139/v63-430
日期:1963.12.1
A study has been made of some factors affecting the migration or elimination of halogen in the Claisen rearrangement of allyl 2,6-dihalophenyl ethers.In the thermal rearrangement of allyl 2,6-dichlorophenyl ether, carried out in a number of solvents of different dielectric constant, halogen migration proceeds somewhat better in highly polar solvents. However, a competitive reduction to the monohalogenated
对烯丙基2,6-二卤代苯基醚的克莱森重排中影响卤素迁移或消除的一些因素进行了研究。在烯丙基2,6-二氯苯基醚的热重排中,在多种不同溶剂中进行了介电常数,卤素迁移在高极性溶剂中进行得更好。然而,在可氧化溶剂和/或产物的存在下,会发生对单卤代烯丙基苯酚的竞争性还原。由于某些溶剂和酚类产物的催化作用,该反应也变得复杂,其结果类似于使用路易斯酸获得的结果。氯化亚锡充当路易斯酸并催化烯丙基 2,6-二氯苯基醚的重排,同时卤素重排。同样,发生卤素的竞争性还原去除。烯丙基 2,6-二溴苯基醚与氯化锌和烯丙基 2,6-二氯苯基醚与溴化锌重排的结果,以及...