排序方式: 共有49条查询结果,搜索用时 281 毫秒
1.
2.
3.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(14):4055-4059
Reported herein is the use of S‐perfluoroalkyl sulfilimino iminiums as a new source of RF radicals under visible‐light photoredox catalysis (RF=CF3, C4F9, CF2Br, CFCl2). These shelf‐stable perfluoroalkyl reagents, readily prepared on gram scale from the corresponding sulfoxide using a one‐pot procedure, allow the efficient photoredox‐induced oxyperfluoroalkylation of various alkenes using fac‐Ir(ppy)3 as the photocatalyst. Importantly, spin‐trapping/electron paramagnetic resonance experiments were carried out to characterize all the radical intermediates involved in this radical/cationic process. 相似文献
4.
Daniel Pinchuk Yosi Kratish Jomon Mathew Lieby Zborovsky Dmitry Bravo‐Zhivotovskii Boris Tumanskii Yitzhak Apeloig 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(22):7513-7517
The first two persistent silenyl radicals (R2C=Si.?R), with a half‐life (t1/2) of about 30 min, were generated and characterized by electron paramagnetic resonance (EPR) spectroscopy. The large hyperfine coupling constants (hfccs) (a(29Siα)=137.5–148.0 G) indicate that the unpaired electron has substantial s character. DFT calculations, which are in good agreement with the experimentally observed hfccs, predict a strongly bent structure (?C=Si?R=134.7–140.7°). In contrast, the analogous vinyl radical, R2C=C.?R (t1/2≈3 h), exhibits a small hfcc (a(13Cα)=26.6 G) and has a nearly linear geometry (?C=C?R=168.7°). 相似文献
5.
6.
7.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(6):1641-1645
British 19th century painters such as J. M. W. Turner, commonly modified the properties of their paint by using gels called “gumtions”. These gels allowed them to easily tune the paint handling and drying properties. The fascinating properties of these “gumtions” were obtained by adding lead acetate to a ternary system based on mastic resin, linseed oil and turpentine. Herein, we report and investigate in depth the rheological properties of these gels as well as their structure at a molecular and supra‐molecular scale. 相似文献
8.
9.
10.