作者:Lanny S. Liebeskind、Marvin S. Yu、Richard H. Yu、Jianying Wang、Karl S. Hagen
DOI:10.1021/ja00073a021
日期:1993.10
oxidative dimerization of (tri-n-butylstannyl)cyclobutene-1,2-diones (providing symmetricallysubstituted bisquaryls) or by a palladium-copper cocatalyzed cross-coupling of 3-substituted-4-(tri-n-butylstannyl)-3-cyclobutene-1,2-diones with 3-halo-4-substituted-3-cyclobutene-1,2-diones (providing a route to unsymmetricallysubstituted bisquaryls). The novel parent bisquaric acid is a very strong BrOnsted acid
4,4'-Bi(cyclobutene-1,2-diones),一种衍生自方酸的新型化合物,此处命名为双方芳基,首次通过钯催化的(三正丁基甲锡烷基)环丁烯氧化二聚反应制备-1,2-二酮(提供对称取代的双四芳基)或通过钯-铜共催化的 3-取代-4-(三正丁基甲锡烷基)-3-环丁烯-1,2-二酮与 3-卤素的交叉偶联-4-取代-3-环丁烯-1,2-二酮(提供不对称取代双四芳基的途径)。新的母体双方酸是一种非常强的布朗斯台德酸,显然在溶解时完全电离;仅观察到一个 pK a 值 (pK a = -4.49)
CYCLOBUTENEDIONE DERIVATIVE, NONAQUEOUS ELECTROLYTIC SOLUTION, AND LITHIUM ION SECONDARY BATTERY
申请人:NEC Corporation
公开号:US20170210764A1
公开(公告)日:2017-07-27
A nonaqueous electrolytic solution comprising a cyclobutenedione derivative represented by the following general formula (1):
wherein R
1
represents an organic group having a carbon-carbon double bond or a carbon-carbon triple bond in its structure, and R
2
represents an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, a thioalkyl group having 1-6 carbon atoms, a substituted or unsubstituted thioaryl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group.
A squarate-based synthesis of ferrocenyl quinones is described. Thermolysis of ferrocenyl-substituted cyclobutenones, prepared from ferrocenyl cyclobutenediones and alkenyllithiums, affords hydroquinones, which furnish, upon oxidation, ferrocenyl quinones. Ferrocenyl cyclobutenediones have been prepared from known cyclobutenediones by nucleophilic addition of ferrocenyllithium followed by hydrolysis
Antimigraine cyclobutenedione derivatives of indolylalkyl-pyridinyl and
申请人:Bristol-Myers Squibb Company
公开号:US05521188A1
公开(公告)日:1996-05-28
A series of novel 5-cyclobutenedione derivatives of indolylalkylpiperazinyl pyridines and pyrimidines of Formula I are intended for use in the alleviation of vascular headaches. ##STR1##
Antimigraine cyclobutenedione derivatives of indolylalkyl-pyridinyl and pyrimidinylpiperazines
申请人:Bristol-Myers Squibb Company
公开号:EP0645385A1
公开(公告)日:1995-03-29
A series of novel 5-cyclobutenedione derivatives of indolylalkylpiperazinyl pyridines and pyrimidines of Formula I are intended for use in the alleviation of vascular headaches.