Results 41 to 50 of about 864,256 (124)

Die Aza‐Büchner–Curtius–Schlotterbeck‐Reaktion: Selektive Bildung Quartärer Kohlenstoffzentren

Angewandte Chemie, EarlyView.
Wir stellen die Aza‐Büchner–Curtius–Schlotterbeck‐(ABCS)‐Reaktion vor: eine milde, katalysatorfreie Methode zur Homologierung von Aryliminen. Im Gegensatz zum traditionellen BCS‐Mechanismus durchläuft das Diazo‐Intermediat eine selektive C─C‐Insertion zur Bildung eines quartären Zentrums.
Simon O. Angerer, Vincent George, Aryaman Pattanik, Gaia Carpentiero, Tereza Morcinková, Julia Rehbein, Burkhard König   +6 more
wiley   +1 more source

Singlet O₂ Produced by Ultraviolet Dissociation of the β‑ionone–O₂ Complex

, 2021
We formed the gas-phase β-ionone–O2 complex in a supersonic expansion and then photodissociated the complex with light near 312 nm. Photodissociation resulted in the production of O2 in the a 1Δg state, which was ionized at 312 nm using (2 + 1) resonance-
Bradley F. Parsons (3056793), Hunter J. Warder (11473731), Mark A. Freitag (2501470)   +2 more
core   +1 more source

β-ionone prevents dextran sulfate sodium-induced ulcerative colitis and modulates gut microbiota in mice

Food Innovation and Advances
β-ionone has various biological activities, such as anti-inflammatory, antimicrobial, and anticancer effects. The pathogenesis of ulcerative colitis is correlated with immune dysfunction, intestinal barrier damage, and gut microbiota imbalance.
Jingjing Fang, Tingting Liu, Yumeng Wang, Seong-Gook Kang, Kunlun Huang, Tao Tong   +5 more
doaj   +1 more source

Aza‐Büchner–Curtius–Schlotterbeck Reaction Enables Selective Construction of Quaternary Carbon Centers

Angewandte Chemie International Edition, EarlyView.
We introduce the Aza‐Büchner–Curtius–Schlotterbeck (ABCS) reaction: A mild, catalyst‐free method for homologating aryl imines. Diverging from the traditional BCS mechanism, the diazo intermediate undergoes selective C─C insertion to form an all‐carbon quaternary center.
Simon O. Angerer, Vincent George, Aryaman Pattanik, Gaia Carpentiero, Tereza Morcinková, Julia Rehbein, Burkhard König   +6 more
wiley   +1 more source

Characterization of a Novel Lutein Cleavage Dioxygenase, EhLCD, from Enterobacter hormaechei YT-3 for the Enzymatic Synthesis of 3-Hydroxy-β-ionone from Lutein

, 2021
3-Hydroxy-β-ionone, a flavor and fragrance compound with fruity violet-like characteristics, is widely applied in foodstuff and beverages, and is currently produced using synthetic chemistry.
Naixin Duan, Tao Wei, Jigang Li, Yun Xue, Zan Su, Min Wang, Qibin Liu, Duobin Mao, Zhangde Long   +8 more
core   +1 more source

Optimizing carotenoid cleavage dioxygenase 4 (CCD4) for enhanced β-ionone production in Nicotiana tabacum

Crop Journal
Carotenoid cleavage dioxygenase 4 (CCD4) controls the rate-limiting step of β-ionone biosynthesis, making it a valuable target for healthcare and pharmaceutical applications. Nicotiana tabacum, a carotenoid-richd crop species, is a promising source for β-
Chen Dong, Yu Zhang, Zifu Ni, Mengxin Shen, Faming Lin, Xiaoran Wang, Yongchun Shi, Yuchen Miao, Jinggong Guo, Ran Wang   +9 more
doaj   +1 more source

Ruta graveolens L. in Evidence‐Based Phytotherapy: Pharmacological Activities, Bioactive Compounds and Safety

Phytotherapy Research, EarlyView.
Graphical representation of ethnomedical uses, major bioactive compounds, pharmacological potential and toxicological risks of Ruta graveolens L. ABSTRACT Ruta graveolens L. is widely used in traditional European, Asian, African, and South American medicine for digestive, nervous, cardiovascular, respiratory, and reproductive disorders.
Tetiana Serhiienko, Victoriya Georgiyants, Liudas Ivanauskas, Olha Mykhailenko   +3 more
wiley   +1 more source

Carotenoid Cleavage Dioxygenase 4 Catalyzes the Formation of Carotenoid-Derived Volatile β‑Ionone during Tea (Camellia sinensis) Withering

, 2020
The carotenoid-derived volatile β-ionone plays an important role in the formation of green and black tea flavors due to its low odor threshold, but its formation and the gene(s) involved in its biosynthesis during the tea withering process is­(are ...
Wilfried Schwab (52238), Xiaochun Wan (408279), Chuankui Song (6790859), Na Zhang (333280), Minyue Zhao (8398344), Bin Wu (138543), Tingting Jing (8194881), Jieyang Jin (8194878), Jingming Wang (1408744)   +8 more
core   +1 more source

Crystal structure of fucoxanthin: resolving a long‐standing crystallographic challenge

Acta Crystallographica Section C, EarlyView.
The first small‐molecule single‐crystal X‐ray structure of fucoxanthin is reported, resolving a long‐standing crystallographic problem in carotenoid structural chemistry.Fucoxanthin (C42H58O6) is a highly functionalized allenic epoxy xanthophyll containing hydroxy, acetoxy, ketone and conjugated polyene units.
Yui Wakasa, Mao Minoura
wiley   +1 more source

The Apocarotenoid β-ionone is a Positive Regulator of Arabidopsis thaliana Response to the Pathogen Botrytis cinerea

, 2022
The necrotrophic fungus Botrytis cinerea (B. cinerea) is one of the most aggressive and widespread pathogenic fungi, causing the gray mold disease in over 200 different plants species and severely impacting the quality of harvested fruits.
Felemban, Abrar
core   +1 more source