Improved Synthetic Route to Heteroleptic Alkylphosphine Oxides
作者:Alexander J. Kendall、Daniel T. Seidenkranz、David R. Tyler
DOI:10.1021/acs.organomet.7b00304
日期:2017.7.10
respective phosphinite anions (pKas for most SPOs are <27). Only sodium bis(trimethylsilyl)amide (NaHMDS) cleanly formed the phosphinite anion, which was stable in solution (0.1 M, 23 °C in THF) for over 24 h. The need for a very specific base to deprotonate suggests that both ion pairing and the conjugate acid play a role in stabilizing the phosphinite anion. Phosphinite anion reactivity followed the expected
为杂烷基膦氧化物的合成的新方法(R 2 - [R 1 P = O,其中R≠ - [R 1)从仲膦氧化物(或战略性计划目标,R 2 HP═O)被呈现。这些反应在室温下快速,空间选择性,高产率,并且在水洗后纯度> 95%。SPO的去质子化反应生成次膦酸酯阴离子([R 2 P–O] -),该阴离子对烷基卤与亲核P–C键的形成具有很高的选择性(与O–C键的形成相反)。出乎意料的是,大多数强有机金属碱都无法将SPO脱质子化为其各自的次膦酸酯阴离子(p K a大多数SPO的s <27)。仅双(三甲基甲硅烷基)酰胺钠(NaHMDS)干净地形成亚膦酸酯阴离子,该亚膦酸酯阴离子在溶液中(0.1 M,在THF中为23°C)稳定24小时以上。需要非常特异的碱去质子化提示离子配对和共轭酸都在稳定次膦酸酯阴离子中起作用。次膦酸酯阴离子的反应性遵循与烷基卤化物反应的S N 2机理的预期趋势。从来没有观察到消除产品。以
METHODS FOR THE PREPARATION OF PHOSPHONIC ACID DERIVATIVES
申请人:PRABHU SITARAM VAIKUNTH
公开号:US20070004937A1
公开(公告)日:2007-01-04
The present invention provides methods for the preparation of aralkyl phosphonic acids and aryl phosphonic acids. In a first method of the invention, an aralkyl dialkyl phosphonate is contacted with an aqueous acidic solution under reflux conditions. Upon cooling, solid crystals of the corresponding aralkyl phosphonic acid are obtained, which can be collected via filtration. In a second method of the invention, an aryl phosphorous dihalide is added to a pot containing an aqueous nitric acid solution while maintaining the pot temperature below about 50° C. and then allowing the reactants to self-reflux. Upon cooling, crystals of the corresponding aryl phosphonic acid are obtained, which can be collected via filtration.
[EN] ORGANIC ELECTRONIC DEVICE COMPRISING AN ORGANIC SEMICONDUCTOR LAYER<br/>[FR] DISPOSITIF ÉLECTRONIQUE ORGANIQUE COMPRENANT UNE COUCHE SEMI-CONDUCTRICE ORGANIQUE
申请人:NOVALED GMBH
公开号:WO2019072928A1
公开(公告)日:2019-04-18
The present invention relates to compounds comprising a TAE structure, for use as a layer material for electronic devices, and to an organic electronic device comprising the layer material, and a method of manufacturing the same.
Novel compounds and methods of using those compounds for the treatment of inflammatory conditions are provided. In a preferred embodiment, modulation of the activation state of p38 kinase protein comprises the step of contacting the kinase protein with the novel compounds.
The present invention relates to a process of preparing a polycondensate in the presence of a fluorescent whitening agent and at least one phosphonate, and/or phosphinate. Further aspects of the invention are a polyester prepared according to this process and composition comprising a polycondensate, a fluorescent whitening agent and at least one phosphonate and/or phosphinate. Yet another aspect is the use of a fluorescent whitening agent and at least one phosphonate and/or phosphinate for improving the color of a polycondensate.