865-47-4Relevant articles and documents
Unusual Reactivity of Silicon Grease Towards Metal Alkoxides: Serendipity for Structural Chemistry
Nahrstedt, Vanessa,Raauf, Aida,Hegemann, Corinna,Brune, Veronika,Schl?fer, Johannes,Mathur, Sanjay
, p. 1102 - 1109 (2021)
Controlled synthesis of moisture sensitive metal alkoxides demands the use of silicon grease for the inert synthetic manipulation of starting materials using glass apparatus to avoid adventitious hydrolysis. Spontaneous reaction of the siloxane units (?OSi(Me3)2)n) with the synthesized alkoxides often leads to molecular metal alkoxides based siloxane frameworks. These spontaneous incorporation of siloxane units into homo- and heterometallic alkoxide building blocks lead to the new multinuclear homo- and heterometallic alkoxide-siloxide compounds [Ce2(OtBu)4{Me2Si(OtBu)O}2(NO3)2] (1), [Zr{(OiPr)2{Me2SiO2}Sr{Zr2(OiPr)8}}2] (2) and [Sn2In2O2{Me2Si(OiPr)O}(OiPr)5]2 (3). Multifunctional coordination properties of these siloxane units enable the molecular approach to synthetically demanding polymetallic complexes for potential MOx-SiOx nanocomposites fabrication.
Synthesis and photochromic properties of new naphthopyrans
Zhao, Qian,Yang, Yanhua,Duan, Yingxiang,Tao, Xian,Shen, YingZhong
, p. 840 - 847 (2018/11/10)
[Figure not available: see fulltext.] Two novel isomeric naphthopyrans substituted with phenyl (13-butyl-6,7-dimethoxy-3,3-bis(6-methoxybiphenyl-3-yl)-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol) and 4-(naphthalen-1-yl)phenyl (13-butyl-6,7-dimethoxy-3,3-bis[6-methoxy-4'-(naphthalenyl)-biphenyl-3-yl]-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol) moieties were synthesized. Their photochromism, electrochemical and fluorescent properties were investigated. They displayed faster color fading rate and larger fluorescence quantum yield than 13-butyl-6,7-dimethoxy-3,3-bis(4-methoxyphenyl)-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol. Moreover, they showed excellent photochromic and fluorescent properties both in solution and in polymethylmethacrylate film. In addition, cyclic voltammetry tests showed that the aromatic substituents had a significant effect on the electrochemical behavior of the naphthopyran derivatives.
Efficient Synthesis of N-Substituted 2,4-Azepandione Ring System as an Active Intermediate for Heterocyclic Syntheses
Waly, Mohamed A.,Yossif, Shiam A.,Ibrahim, Ismail T.,Sofan, Mamdouh A.
, p. 1318 - 1326 (2017/03/27)
An improved efficient synthesis for 2,4-azepandiones (3, 8, and 14) could be achieved by a careful control of the reaction conditions to cyclize ethyl 4-(N-acetylarylamino) butanoate (1, 7, and 13), respectively. The ethyl 4-arylamino butanoate (9 or 12) was prepared by stirring the ethyl 4-bromobutanoate and substituted anilines at room temperature. Then, they were acetylated with acetyl chloride and triethylamine under the conditions that avoid the formation of 2-pyrrolidinone derivatives 10. Due to the rapid decomposition of the acetylated product (7 or 13) to its starting material (9 or 12), the reaction mixture is directly transferred without workup to the next cyclization step. The azepandione synthesis is favored by using a weak base at low temperature, where it is in a competition with the other modes of ring closure. The structures of the new compounds were supported by correct analytical and spectral data.
Apparatus for producing of potassium tert -butoxide
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Paragraph 0028; 0029, (2017/07/01)
The utility model relates to an apparatus for producing of potassium tert -butoxide, including: reation kettle (1), reation kettle (1) loop through delivery pump (2), heater (3) are connected with pervaporation membrane separation unit (4), the export of holding back the side of pervaporation membrane separation unit (4) is connected with reation kettle (1), the infiltration side of pervaporation membrane separation unit (4) is provided with vacuum pump (5) and penetrant condenser (6), and (6) exit of penetrant condenser still is connected with infiltration fluid reservoir (7) and infiltration liquid pump (8). The utility model discloses process is simple, and conversion is rateed highly, and factor of safety is high, does not introduce the third component, and operating power consumption is low, and energy utilization is high.
Preparation method for low residual granular sodium alkoxide or potassium alcoholate
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Paragraph 0039-0040, (2017/01/17)
The invention provides a preparation method for low residual granular sodium alkoxide or potassium alcoholate. The method includes using sodium or potassium and alcohol as raw materials, mixing the mixture with a solvent, reacting in inert gas atmosphere by using a microwave heating method, and removing the residual alcohol and solvent in the presence of microwave after the reaction to get the granular sodium alkoxide or potassium alcoholate. The microwave frequency is 2450 +/- 50 MHz. The method can prepare sodium alkoxide or potassium alcoholate with low residual solvent, and the prepared sodium alkoxide or potassium alcoholate is large granular solid, so that the development from powdered product to granular product can be realized, and the problems of residual solvent and potential risk troubled human for a long time can be overcome.
Method and device for producing potassium tert-butoxide
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Paragraph 0026, (2017/06/02)
The invention relates to a device and technology for producing potassium tert-butoxide. The technology includes the following specific steps that 1, tertiary butanol and potassium hydroxide are reacted in a reaction kettle, and the liquid-phase reactant is fed into a pervaporation membrane for dehydration; 2, the material obtained through dehydration is returned into the reaction kettle to continue to participate in reacting. According to the device and technology, the process is simple, the reaction conversion ratio is high, the safety coefficient is high, third components are avoided, running energy consumption is low, and the energy utilization ratio is high.
Structurally Simple Benzyl-Type Photolabile Protecting Groups for Direct Release of Alcohols and Carboxylic Acids
Wang, Pengfei,Lu, Wenya,Devalankar, Dattatray A.,Ding, Zhenying
, p. 2114 - 2117 (2015/05/13)
Structurally simple benzyl-type photolabile protecting groups (PPGs) have been developed to release alcohols and carboxylic acids. Release of two substrates from one PPG chromophore has also been accomplished. (Chemical Equation Presented).
Phosphorescent OLED and hole transporting materials for phosphorescent OLEDs
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Page/Page column, (2014/05/07)
The present invention relates to phosphorescent organic light-emitting diodes (OLEDs) comprising a hole-transporting or a hole-transporting and an electron-blocking layer comprising an N,N,N',N'-tetraaryl-phenylene-3,5-diamine or an N,N,N',N'-tetraaryl-1,1'-biphenyl-3,3'-diamine matrix compound and to new N,N,N',N'-tetraarylsubstituted m-arylene diamine compounds useful as hole-transporting and electron-blocking layer matrices in phosphorescent OLEDs.
Novel antimalarial 3-azabicyclo[3.2.2]nonane derivatives
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, (2011/04/24)
The present invention relates to novel 3-azabicyclo[3.2.2]nonane derivatives of the general formula (I) or a pharmaceutically acceptable salt thereof wherein R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are as defined in the specification. The novel 3-azabicyclo[3.2.2]nonane derivatives are particularly useful for treatment and prevention of malaria and trypanosomiasis.
SPIRO COMPOUNDS USEFUL AS ANTAGONISTS OF THE H1 RECEPTOR
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Page/Page column 32, (2009/03/07)
The invention provides a compound of formula (I) or a pharmaceutically acceptable salt thereof, for treating diseases and conditions of the central nervous system (CNS), in particular sleep disorders.
