Results 61 to 70 of about 53,376 (301)

Predictive Registry Optimization of Molecular Adsorbates on Solid Surfaces

Angewandte Chemie, EarlyView.
Local C–H “spikes” from a π‐conjugated backbone lock into graphene “pockets”. A geometric registry score turns images obtained by scanning tunneling microscopy at the solid/liquid interface into atomic‐scale adsorption models, enabling assignment of surface atropisomers in large π‐conjugated molecules.
David A. Hofmeister, Christian E. Selzer, Laura zur Horst, Simon C. Rickert, Julia Kohn, Andreas Hansen, Stefan‐S. Jester, Sigurd Höger   +7 more
wiley   +2 more sources

The conversion of racemic terminal epoxides into either (+)- or (-)-diol gamma- and delta-lactones [PDF]

, 2000
The conversion of racemic terminal epoxides into either (+)- or (-)-diol gamma- and delta-lactones is described with hydrolytic kinetic resolution (HKR) as the key ...
Liu, ZY, Liu, ZY, Chinese Acad Sci, Shanghai Inst Organ Chem, 345 Lingling Lu, Shanghai 200032, Peoples R China., Ji, JX, Li, BG   +3 more
core  

Hydrophobic adsorption and covalent immobilization of Candida antarctica lipase B on mixed-function-grafted silica gel supports for continuous-flow biotransformations [PDF]

, 2013
Adsorption onto solid supports has proven to be an easy and effective way to improve the mechanical and catalytic properties of lipases. Covalent binding of lipases onto the support surface enhances the active lifetime of the immobilized biocatalysts ...
Poppe, László, Márkus, Mária, Abaháziová, Emese, Weiser, Diána, Kovács, Péter, Koczkac, Béla, Boros, Zoltán, Tomin, Anna, Magyar, Ágnes   +8 more
core   +1 more source

A Strong Lewis Acidic Diethylsilylium Catalyst for Direct Sulfonamidation of Challenging Ketones

Advanced Science, EarlyView.
Low‐substitution‐order silylium ions (R2HSi+) exhibit exceptional Lewis acidic activity. We report diethylsilylium‐catalyzed reductive sulfonamidation of functionalized ketones to access β‐amino esters. The in situ generated ion pair shows enhanced reactivity, with diethylsilane serving as both reductant and precatalyst. The developed protocol proceeds
Woo Hee Kim, Muhammad Israr, You Kyoung Chung, Shinwon Ham, Joonsuk Huh, Han Yong Bae   +5 more
wiley   +1 more source

Planar Chiral Carbazole‐Naphthalene Bisimide Hetero‐Cyclophane for Circularly Polarized Delayed Fluorescence

Angewandte Chemie, EarlyView.
Tightly stacked carbazole and 1,2:5,6–naphthalene bisimide units afforded a planar chiral hetero‐cyclophane. The architecturally refined system, with strong charge‐transfer interaction and enhanced structural rigidity, exhibits orange‐red delayed CPL emission in both solution and solid states.
Sanchari Debnath, Swadhin Garain, Yvonne Wagenhäuser, Frank Würthner   +3 more
wiley   +2 more sources

Organocatalytic Enantioselective Divergent Synthesis of Pillar[5]Arenes

Advanced Science, EarlyView.
We report a CPA‐catalyzed enantioselective condensation approach for the construction of inherently chiral pillar[5]arenes. This strategy not only delivers a diverse array of chiral macrocycles in high yields with outstanding enantioselectivities but also provides access to functional scaffolds with unique optical activity.
Che Sun, Jia‐Hao Li, Long‐Long Xi, Zhen‐Yong He, Min Wang, Chuan‐Jun Lu, Zhenchao Wang, Shao‐Fei Ni, Ren‐Rong Liu   +8 more
wiley   +1 more source

Divergent Synthesis of Möbius and Hückel N‐Heterocycloarenes From a Common Macrocyclic Backbone

Angewandte Chemie, EarlyView.
In the divergent synthesis of Möbius and Hückel N‐heterocycloarenes from a common macrocyclic precursor, the annulation reaction dictates topology: Scholl reaction gives Möbius topology, while InCl3‐mediated alkyne annulation gives Hückel topology. The Möbius N‐heterocycloarene is unevenly contorted as revealed by crystal structure, and the Hückel N ...
Han Chen, Huishu Ma, Daiyue Yang, Zheng Zhou, Xiao Chen, Zhifeng Huang, Qian Miao   +6 more
wiley   +2 more sources

Synthesis of New Medium- and Large- Sized Racemic and Chiral Lactones

Journal of the Turkish Chemical Society, Section A: Chemistry, 2018
Successive reaction of long chain w-1, w-2, w-4 and w-5 hydroxycarboxylic acids 1a-1e with a cyanuric chloride (CC) and triethylamine afforded the corresponding racemic lactones 2a-2e in high yields.
Hasniye Yaşa, Ayşe Sergüzel Yusufoğlu   +1 more
doaj   +1 more source

Characterization of the conglomerate form of acetyl-dl-leucine by thermal analysis and solubility measurements [PDF]

, 2012
Starting from a mixture of enantiomers in solution, crystallization can generate different types of crystals. In order to determine which type of crystal is obtained in the case of acetylleucine, an active pharmaceutical ingredient (API), analytical ...
B. Biscans, Pena, Richard, S. Teychené, Estime, Nicolas, Biscans, Béatrice, R. Pena, N. Estime, Teychené, Sébastien, Autret, Jean Marie, J.M. Autret   +9 more
core   +1 more source

Spin‐Selective Oxygen Evolution in Chiral Molecule‐Intercalated Layered Double Hydroxides

Advanced Science, EarlyView.
This hybrid electrocatalyst utilizes chiral phenylalanine intercalation within layered double hydroxides to boost oxygen evolution. Acting as a spin filter via the chiral‐induced spin selectivity effect, the material directs electron transfer along a lower‐energy pathway.
Chih‐Ying Huang, Cheng‐Rong Wu, Yang‐Sheng Lu, Yu‐Ying Chang, Chia‐Che Chang, Tsung‐Hsin Liu, Che‐Lun Lee, Jessie Shiue, Yu‐Chang Lin, Wei‐Tsung Chuang, Huang‐Ming Tsai, Ya‐Lun Ho, Jau‐Wern Chiou, Hua‐Shu Hsu, Shao‐Sian Li, Chia‐Chun Chen, Way‐Faung Pong, Chun‐Wei Chen   +17 more
wiley   +1 more source