Fluorinateddi-enes may be obtained by the defluorination of some oligomers of F-alkenes and -cycloalkenes using tetrakis(dimethylamino)ethene. These di-enes are very susceptible to nucleophilic attack. Nucleophilic epoxidation of (4) gives a new diepoxide which undergoes a novel ring-opening reaction. Di-ene (4) forms cyclopentadienylide derivatives with di-functional carbon nucleophiles and a cyclopentadienylide
Reactions involving fluoride ion. Part 18. Derivatives of perfluorocycloalkenes
作者:Richard D. Chambers、Graham Taylor、Richard L. Powell
DOI:10.1039/p19800000429
日期:——
Unlike perfluorocyclobutene, perfluorocyclo-pentene and -hexene do not form oligomers with pyridine. A range of oligomers is obtained from mixtures of perfluorocycloalkenes in reactions initiated by caesium fluoride. Products are also obtained from perfluorocycloalkenes with perfluoropropene and between perfluorocyclobutene and perfluorobut-2-ene. A variation is observed in the balance between exo-
Reactions involving fluoride ion. Part 21 [1]. Nucleophilic substitution reactions of perfluorocyclobutene oligomers
作者:Richard D. Chambers、Graham Taylor、Richard L. Powell
DOI:10.1016/s0022-1139(00)82391-x
日期:1980.8
Reaction of perfluorocyclobutene oligomers, (1) - (4), with some simple nucleophiles gives products arising from SN2′ displacement [N.B. this term is used here to describe the overall process of addition of a nucleophile to an alkene and elimination of an allylic fluorine and is not meant to imply that the reaction is concerted] or vinylic substitution of fluorine, or a mixture of both processes. The
全氟环丁烯低聚物(1)-(4)与一些简单的亲核试剂反应,可得到由S N 2'置换产生的产物[NB该术语在此用于描述将亲核试剂添加至烯烃并消除环己烯的整个过程。烯丙基氟,并不意味着该反应是一致的]或氟的乙烯基取代,或这两种方法的混合物。二聚体(1)和(2)的反应性比无环类似物的反应性大得多,这可以归因于这些化合物中存在的环应变。
Reactions involving fluoride ion. Part 17. Oligomers of perfluorocyclobutene
作者:Richard D. Chambers、Graham Taylor、Richard L. Powell
DOI:10.1039/p19800000426
日期:——
Reaction of perfuorocyclobutene (1) with fluorideion gives mainly a trimer (6) together with dimers (3) and (4) and a tetramer (7). The tetramer (7) is also obtained directly from the dimers (3) and (4). Reaction of (1) with pyridine provides a useful route to dimers (3) and (4) and a different trimer (10). The structures of these oligomers have been established and mechanisms for their formation
Reactions involving fluoride ion. Part 19. Observable perfluorocycloalkylanions
作者:Richard D. Chambers、Raymond S. Matthews、Graham Taylor、Richard L. Powell
DOI:10.1039/p19800000435
日期:——
Carbanions are generated by reaction of fluorideion with perfluorocycloalkene derivatives, e.g. perfluorobicyclobutylidene (3), and this anion is relatively unchanged over a range of temperature or on prolonged standing, as indicated by the 19F n.m.r. spectrum. Internal return by fluorideion to the same carbon atom is suggested to account for the 19F n.m.r. spectra of the ions. Trapping experiments
碳离子是通过氟离子与全氟环烯烃衍生物(例如)反应生成的。全氟双环丁烯(3),并且该阴离子在一定温度范围内或长时间放置后相对不变,如19 F nmr光谱所示。建议通过氟离子内部返回相同的碳原子来解释离子的19 F nmr光谱。用溴和氯进行的捕集实验为离子的结构提供了进一步的证据。