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排序方式: 共有75条查询结果,搜索用时 15 毫秒
1.
Carina I. Jette Irina Geibel Shoshana Bachman Masaki Hayashi Shunya Sakurai Hideki Shimizu Jeremy B. Morgan Brian M. Stoltz 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(13):4341-4345
Herein, we report the first Pd‐catalyzed enantioselective arylation of α‐substituted γ‐lactams. Two sets of conditions were developed for this transformation, allowing for the use of either aryl chlorides or bromides as electrophiles. Utilizing a highly electron‐rich dialkylphosphine ligand we have been able to construct α‐quaternary centers in good yields (up to 91 % yield) and high enantioselectivities (up to 97 % ee). 相似文献
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P. Walter J. H. Brunn H. Schanz W. F. Bruce W. Bach K. Suzuki F. E. Raurich-Sas E. Busse P. Görlich A. H. Furnstal J. M. Voith G. B. Bachman und J. Hudig 《Fresenius' Journal of Analytical Chemistry》1936,107(5-6):201-205
Ohne Zusammenfassung 相似文献
3.
Binary alloys of lead and tin were dissolved in nitric acid (1 + 1) containing 10% sodium fluoride. The tin(IV) was effectively masked by the fluoride. The lead was quickly and accurately titrated with EDTA in a hexamine-buffered solution, with Xylenol Orange as indicator. 相似文献
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Thermally Rearranged Polymer Membranes Containing Tröger's Base Units Have Exceptional Performance for Air Separations 下载免费PDF全文
Stephen M. Meckler Dr. Jonathan E. Bachman Benjamin P. Robertson Chenhui Zhu Prof. Jeffrey R. Long Dr. Brett A. Helms 《Angewandte Chemie (International ed. in English)》2018,57(18):4912-4916
The influence of segmental chain motion on the gas separation performance of thermally rearranged (TR) polymer membranes is established for TR polybenzoxazoles featuring Tröger's base (TB) monomer subunits as exceptionally rigid sites of contortion along the polymer backbone. These polymers are accessed from solution‐processable ortho‐acetate functionalized polyimides, which are readily synthesized as high‐molecular‐weight polymers for membrane casting. We find that thermal rearrangement leads to a small increase in d‐spacing between polymer chains and a dramatic pore‐network reconfiguration that increases both membrane permeability and O2/N2 selectivity, putting its performance above the 2015 upper bound. 相似文献
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We report a diffraction-based, label-free biosensor on the surface of a planar optical waveguide. By selectively immobilizing proteins on an optical waveguide, the proteins can form the ridge/valley of a latent image optical grating. Binding events with patterned surface proteins dynamically increase grating height and cause an increase in light coupling out of the waveguide. We demonstrate the efficacy of this strategy for protein detection and present the design and fabrication of a device. 相似文献
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A cyclotomic polynomial n is said to be of order 3 if n = pqrfor three distinct odd primes p, q, and r. We establish theexistence of an infinite family of such polynomials whose coefficientsdo not exceed 1 in modulus. 2000 Mathematics Subject Classification11B83, 11C08. 相似文献