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排序方式: 共有203条查询结果,搜索用时 25 毫秒
61.
62.
Quentin Michaudel Guillaume Journot Alicia Regueiro‐Ren Animesh Goswami Zhiwei Guo Thomas P. Tully Lufeng Zou Raghunath O. Ramabhadran Kendall N. Houk Phil S. Baran 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2014,126(45):12287-12292
Physicochemical properties constitute a key factor for the success of a drug candidate. Whereas many strategies to improve the physicochemical properties of small heterocycle‐type leads exist, complex hydrocarbon skeletons are more challenging to derivatize because of the absence of functional groups. A variety of C H oxidation methods have been explored on the betulin skeleton to improve the solubility of this very bioactive, yet poorly water‐soluble, natural product. Capitalizing on the innate reactivity of the molecule, as well as the few molecular handles present on the core, allowed oxidations at different positions across the pentacyclic structure. Enzymatic oxidations afforded several orthogonal oxidations to chemical methods. Solubility measurements showed an enhancement for many of the synthesized compounds. 相似文献
63.
王尔东 Jö rg Kewisch Ilan Ben-Zvi Andrew Burrill Trivini Rao 吴琼 Animesh Jain Ramesh Gupta Doug Holmes 赵夔 《中国物理 C》2011,35(4):387-391
A great deal of effort has been made over the last decades to develop a better polarized electron source for high energy physics. Several laboratories operate DC guns with a gallium arsenide photocathode, which yield a highly polarized electron beam. However, the beam's emittance might well be improved by using a superconducting radio frequency (SRF) electron gun, which delivers beams of a higher brightness than that from DC guns because the field gradient at the cathode is higher. SRF guns with metal and CsTe cathodes have been tested successfully. To produce polarized electrons, a Gallium-Arsenide photo-cathode must be used: an experiment to do so in a superconducting RF gun is under way at BNL. Since a bulk gallium arsenide (GaAs) photocathode is normal conducting, a problem arises from the heat load stemming from the cathode. We present our measurements of the electrical resistance of GaAs at cryogenic temperatures, a prediction of the heat load and verification by measuring the quality factor of the gun with and without the cathode at 2 K. We simulate heat generation and flow from the GaAs cathode using the ANSYS program. By following the findings with the heat load model, we designed and fabricated a new cathode holder (plug) to decrease the heat load from GaAs. 相似文献
64.
Segregation of Dispersed Silica Nanoparticles in Microfluidic Water-in-Oil Droplets: A Kinetic Study
Sahana Sheshachala Dr. Maximilian Grösche Tim Scherr Yong Hu Pengchao Sun Andreas Bartschat Prof. Dr. Ralf Mikut Prof. Dr. Christof M. Niemeyer 《Chemphyschem》2020,21(10):1070-1078
Dispersed negatively charged silica nanoparticles segregate inside microfluidic water-in-oil (W/O) droplets that are coated with a positively charged lipid shell. We report a methodology for the quantitative analysis of this self-assembly process. By using real-time fluorescence microscopy and automated analysis of the recorded images, kinetic data are obtained that characterize the electrostatically-driven self-assembly. We demonstrate that the segregation rates can be controlled by the installment of functional moieties on the nanoparticle's surface, such as nucleic acid and protein molecules. We anticipate that our method enables the quantitative and systematic investigation of the segregation of (bio)functionalized nanoparticles in microfluidic droplets. This could lead to complex supramolecular architectures on the inner surface of micrometer-sized hollow spheres, which might be used, for example, as cell containers for applications in the life sciences. 相似文献
65.
Efficient Access to Substituted Silafluorenes by Nickel‐Catalyzed Reactions of Biphenylenes with Et2SiH2 下载免费PDF全文
Jens Michael Breunig Puneet Gupta Dr. Animesh Das Dr. Samat Tussupbayev Dr. Martin Diefenbach Dr. Michael Bolte Prof. Dr. Matthias Wagner Prof. Dr. Max C. Holthausen Dr. Hans‐Wolfram Lerner 《化学:亚洲杂志》2014,9(11):3163-3173
The reaction of biphenylene ( 1 ) with Et2SiH2 in the presence of [Ni(PPhMe2)4] results in the formation of a mixture of 2‐diethylhydrosilylbiphenyl [ 2 (Et2HSi)] and 9,9,‐diethyl‐9‐silafluorene ( 3 ). Silafluorene 3 was isolated in 37.5 % and 2 (Et2HSi) in 36.9 % yield. The underlying reaction mechanism was elucidated by DFT calculations. 4‐Methyl‐9,9‐diethyl‐9‐silafluorene ( 7 ) was obtained selectively from the [Ni(PPhMe2)4]‐catalyzed reaction of Et2SiH2 and 1‐methylbiphenylene. By contrast, no selectivity could be found in the Ni‐catalyzed reaction between Et2SiH2 and the biphenylene derivative that bears tBu substituents in the 2‐ and 7‐positions. Therefore, two pairs of isomers of tBu‐substituted silafluorenes and of the related diethylhydrosilylbiphenyls were formed in this reaction. However, a subsequent dehydrogenation of the diethylhydrosilylbiphenyls with Wilkinson’s catalyst yielded a mixture of 2,7‐di‐tert‐butyl‐9,9‐diethyl‐9‐silafluorene ( 8 ) and 3,6‐di‐tert‐butyl‐9,9‐diethyl‐9‐silafluorene ( 9 ). Silafluorenes 8 and 9 were separated by column chromatography. 相似文献
66.
A one-pot three-component protocol has been developed for the synthesis of amino ester-embedded benzimidazoles under metal-free neutral conditions. Sequentially, the methodology involves coupling of an amino ester with 1-fluoro-2-nitrobenzene, reduction of the coupled nitroarene by sodium dithionite, and cyclization of the corresponding diamine with an aldehyde. 相似文献
67.
68.
Jaydip Gangopadhyay Samir Das Suman Sengupta Indranil Chakraborty Animesh Chakravorty 《Journal of Chemical Sciences》2003,115(5-6):333-339
The title transformations are oxygen atom transfer, twin isomerization and regiospecific imine oxidation.Bispyridyldiazole ligands have furnished new oxygen atom transfer reagents of coordination type ReVOCl3(NN) which undergo a slower transfer to PPh3 than the corresponding azole reagents. The rate of twin isomerization (linkage and geometrical) of meridional azole complexes
of coordination type ReIII(OPnP)Cl3(NN) to facial ReIII(PnPO)Cl3(NN) decreases rapidly asn increases in the interval 1–4 (PnP is Ph2P(CH2)nPPh2). An α-diimine chelate of type ReV(NPh)Cl3(NN) is shown to undergo facile oxidation to the corresponding iminoamide complex ReVI(NPh)Cl3(NN) upon treating with dilute nitric acid. The reaction proceeds via regiospecific nucleophilic addition of waterto the more
polarized imine function.
Dedicated to Professor C N R Rao on his 70th birthday 相似文献
69.
Uttam Bhaumik Animesh Ghosh Uttam Mandal Bappaditya Chatterjee Amlan Kanti Sarkar Anirbandeep Bose Kamala Kanta Ray Tapan Kumar Pal 《Chromatographia》2008,68(9-10):713-720
A bioanalytical method has been developed and validated for determination of drospirenone in human plasma. The analytical method consists in the extraction of plasma sample with dichloromethane, followed by determination of drospirenone by LC–MS–MS using levonorgestrel as internal standard. Separation was achieved on a Peerless cyano column with an isocratic mobile phase consisting of methanol and ammonium formate buffer. Protonated ions formed by a Turboionspray in the positive mode were used to detect analyte and IS. The MS–MS detection was by monitoring the fragmentation for drospirenone and for levonorgestrel on a triple quadrupole mass spectrometer. The assay was calibrated over the range 5–100 ng mL?1 with a correlation coefficient of 0.9998. Validation data showed intra-batch (n = 6) CV% ≤ 5.58 and RE (%) between ?3.34 and +6.27 and inter-batch (n = 18) CV% < 6.08 and RE (%) between ?1.84 and +6.73. Mean extraction recovery were 83.31–92.58% for three QC samples and 89.32% for IS. Plasma samples were stable for three freeze-thaw cycles, or 24 h ambient storage, or 1 and 3 months storage at ?20 °C. Processed samples (ready for injection) were stable up to 72 h at autosampler (4 °C). This method has been used for analyzing plasma samples from a bioequivalence study with 12 volunteers. 相似文献
70.
Sadhasivam Sahana Shanmugam Megala Umamaheswaran Pillai Divya Venkattappan Anbazhagan Shanmugam Anusuya 《Journal of Cluster Science》2021,32(6):1441-1455
Journal of Cluster Science - Nanoparticles refer to ultrafine particles with the particle size at nanoscale. When metals and metal oxides were synthesized at nanoscale, by their unique properties... 相似文献