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排序方式: 共有163条查询结果,搜索用时 15 毫秒
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Declan P. Gavin Aoife Foley Thomas S. Moody U.B. Rao Khandavilli Simon E. Lawrence Pat ONeill Anita R. Maguire 《Tetrahedron: Asymmetry》2017,28(4):577-585
Hydrolase-catalysed dynamic kinetic resolutions of chroman-2-ol and 3-methyl chroman-2-ol can be effected with up to 88% conversion and 92% ee through the use of organic solvents. Extension to the resolution of the tolterodine precursor 1 proved more challenging. The presence of the remote phenyl substituent had a significant impact on the resolution and it was not possible to achieve high enantioselectivity together with efficient conversion from the focussed panel of enzymes screened. 相似文献
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Yinghuai Z Peng AT Carpenter K Maguire JA Hosmane NS Takagaki M 《Journal of the American Chemical Society》2005,127(27):9875-9880
Substituted C(2)B(10) carborane cages have been successfully attached to the side walls of single-wall carbon nanotubes (SWCNTs) via nitrene cycloaddition. The decapitations of these C(2)B(10) carborane cages, with the appended SWCNTs intact, were accomplished by the reaction with sodium hydroxide in refluxing ethanol. During base reflux, the three-membered ring formed by the nitrene and SWCNT was opened to produce water-soluble SWCNTs in which the side walls are functionalized by both substituted nido-C(2)B(9) carborane units and ethoxide moieties. All new compounds are characterized by EA, SEM, TEM, UV, NMR, and IR spectra and chemical analyses. Selected tissue distribution studies on one of these nanotubes, {([Na(+)][1-Me-2-((CH(2))(4)NH-)-1,2-C(2)B(9)H(10)][OEt])(n)(SWCNT)} (Va), show that the boron atoms are concentrated more in tumors cells than in blood and other organs, making it an attractive nanovehicle for the delivery of boron to tumor cells for an effective boron neutron capture therapy in the treatment of cancer. 相似文献
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Taming Hazardous Chemistry in Flow: The Continuous Processing of Diazo and Diazonium Compounds 下载免费PDF全文
Dr. Benjamin J. Deadman Dr. Stuart G. Collins Prof. Anita R. Maguire 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(6):2298-2308
The synthetic utilities of the diazo and diazonium groups are matched only by their reputation for explosive decomposition. Continuous processing technology offers new opportunities to make and use these versatile intermediates at a range of scales with improved safety over traditional batch processes. In this minireview, the state of the art in the continuous flow processing of reactive diazo and diazonium species is discussed. 相似文献
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A method for the extraction and determination of butyltin compounds in sewage and sludge is reported. Sewage and sludge samples are acidified and shaken for 2 h. The various butyltin species are extracted quantitatively by tropolone (cycloheptatrienone) in toluene, followed by ethylation to their tetraalkyl-substituted forms, BuSnEt3, Bu2SnEt2, Bu3SnEt and Et4Sn, all of which can be separated and determined by a gas chromatographic-atomic absorption spectrometric technique. The non-pesticidal octyltin species and acid-leachable SnIV species can also be determined by this method. Detection limits expressed as Sn are 40 ng dm-3 and 2 ng g-1 dry mass for sewage and sludge, respectively. Analyses of some samples from Canadian treatment plants are given. 相似文献
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Kenneth H. Dudley Daniel L. Bius James H. Maguire 《Journal of heterocyclic chemistry》1978,15(6):923-926
Synthetic routes are described tor the preparation of internal standards for analytical determinations of the antiepileptic agent primidone ( 1 ) and one of its primary in vivo metabolites, phenylethylmalonamide (PEMA, 3). The internal standards synthesized in the present study are p-methylprimidone ( 9 ) and p-methylPEMA ( 8 ). The internal standards differ in structure from the parent drug and metabolite in that the phenyl substituents of the drug and metabolite have been replaced by p-tolyl substituents. The synthetic route for the preparation of p-methylPEMA (8) entailed conversion of an appropriately substituted malonate to a 4,4-disubstituted pyrazoli-dine-3,5-dione, and Raney nickel reduction of the latter substance to a malonamide. This same sequence of reactions was useful for the preparation of PEMA (3) itself. A fusion of p-methylPEMA (8) with formic acid and formamidine acetate resulted in the formation of p-methyl-primidone (9). 相似文献
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Burgess John Maguire Sarah McGranaghan Andrea Parsons Simon A. Nowicka Beata Samotus Alina 《Transition Metal Chemistry》1998,23(5):615-618
We report solvent effects on the piezochromic behaviour of wavelengths of maximum absorption for metal-to-ligand charge-transfer (m.l.c.t.) bands of several molybdenum–diimine–carbonyl and titanium or vanadium–cyclopentadienyl or ethylmaltolate–thiocyanate complexes. These and previously published data are collated in an attempt to establish a pattern for solvent effects on piezochromism of m.l.c.t. bands. Strategies for the design of compounds and complexes for use in establishing a clear pattern for such effects are outlined. 相似文献