Results 71 to 80 of about 3,742 (239)

B-Alkyl Suzuki couplings for the stereoselective synthesis of substituted pyrans [PDF]

, 2008
Unprotected homoallylic alcohols can be directly converted to cis-2,6-disubstituted pyrans by palladium catalyzed B-alkyl Suzuki coupling and subsequent Michael ...
Fürstner, A., O'Neil, G.
core   +1 more source

Organic photonic synaptic transistors for bionic vision: From spectral engineering to flexible intelligent perception

FlexMat, EarlyView.
Different wavelength photonic synapses are used for biomimetic visual applications. Abstract Bionic intelligent visual perception systems have significant application prospects in fields such as autonomous driving and robotics, medical imaging and auxiliary diagnosis, security and monitoring.
Longlong Jiang, Shan Wu, Silu Feng, Heyi Huang, Wangyu Wu, Hong Han, Yao Ni   +6 more
wiley   +1 more source

Synthesis of Microbial‐Derived Octadecanoids

Lipids, EarlyView.
C18‐carbon containing dietary polyunsaturated fatty acids (e.g., linoleic acid, α‐linolenic acid, and γ‐linolenic acid) are metabolized by bacteria in the gut into oxygenated lipid mediators termed octadecanoids. To study the biological function of these compounds, we report here the chemical synthesis of multiple octadecanoids.
Johanna Revol‐Cavalier, Katarína Bankóová, Olivier Salamin, Alessandro Quaranta, Juan Du, Mats Hamberg, Craig E. Wheelock   +6 more
wiley   +1 more source

An Efficient, Simple and Green Zn(Phen)2Cl2 Complex Catalyzed Synthesis of 4-H-Benzo[b]pyrans in Water at Ambient Temperature

E-Journal of Chemistry, 2011
An efficient method for the synthesis of 4-H-benzo[b]pyrans has been developed by the use of Zn(Phen)2Cl2(2 mol%) as an ecofriendly catalyst. The mixture of an appropriate aldehyde, malononitrile and dimedone in the presence of the Zn(Phen)2Cl2 as an ...
E. Mosaddegh, A. Hassankhani, G. Mansouri   +2 more
doaj   +1 more source

Gradient‐Structured Polymer Fiber Mats for Broadly Tunable Multicolor and White Lasing

Laser &Photonics Reviews, EarlyView.
Hierarchically engineered electrospun fiber mats containing separated red, green, and blue dyes enable highly tunable multicolor and white random lasing. Spatially controlled dye distribution suppresses energy transfer, allowing precise color adjustment across wide color gamuts and accurate reproduction of daylight white standards.
Alina Szukalska, Kinga Halicka‐Stępień, Jastin Popławski, Katarzyna Kołodzińska, Michal Majkowski, Joanna Cabaj, Lech Sznitko   +6 more
wiley   +1 more source

Prins fluorination cyclisations: Preparation of 4-fluoro-pyran and -piperidine heterocycles

Beilstein Journal of Organic Chemistry, 2010
The Prins reaction was investigated using BF3·OEt2 as a Lewis acid. It has been recently demonstrated, that if BF3·OEt2 is used in stoichiometric amounts then these reactions generate fluorinated products where the BF3·OEt2 contributes fluoride ion to ...
Guillaume G. Launay, Alexandra M. Z. Slawin, David O'Hagan   +2 more
doaj   +1 more source

The continuing significance of chiral agrochemicals

Pest Management Science, Volume 81, Issue 4, Page 1697-1716, April 2025.
In the time frame 2018–2023, around 43% of the 35 chiral agrochemicals introduced to the market (herbicides, fungicides, insecticides, acaricides, and nematicides) contain one or more stereogenic centers in the molecule, and almost 69% of them have been marketed as racemic mixtures of enantiomers or stereoisomers.
Peter Jeschke
wiley   +1 more source

[Chemical and pharmaceutical research on pyran derivatives. X. Synthesis of 1-oxo-2-alkyl-3-dialkylamino-1H-naphtho[2,1b]pyrans].

, 1978
When reaction of N,N-dialkyl-alpha-ethoxycarbonyl-alpha-alkylacetamides with beta-naphthol in the presence of phosphorus oxychloride was carried out in chlorobenzene at reflux, formation of 1-oxo-2-alkyl-3-dialkyl-amino-1H-naphtho[2,1-b]pyrans was ...
Roma G, DI BRACCIO, MARIO, Ermili A., BALBI, ALESSANDRO   +3 more
core   +1 more source

pKa engineering of a near‐infrared fluorescent probe for sensitive imaging of oxidative stress in atherosclerotic plaques

Smart Molecules, EarlyView.
A pKa‐engineered near‐infrared fluorescent probe (DCM‐2F‐B) enables sensitive imaging of oxidative stress in atherosclerotic plaques. Difluoro substitution lowers the phenolic hydroxyl pKa from 9.1 to 6.0, achieving near‐complete ionization at physiological pH.
Qianqian Yu, Jiahui Liang, Tijian Zhou, Qiaomeng Chen, Xuechun Yan, Zhikang Zheng, Huyou Wang, Jihong Liu, Yi Dong, Wei‐Hong Zhu, Qi Wang   +10 more
wiley   +1 more source

Potassium phthalimide promoted green multicomponent tandem synthesis of 2-amino-4H-chromenes and 6-amino-4H-pyran-3-carboxylates

Journal of Saudi Chemical Society, 2014
A one-pot efficient, green, practical, and environmentally friendly multicomponent synthesis of 5-oxo-4-aryl-5,6,7,8-tetrahydro-4H-chromenes, ethyl-6-amino-4-aryl-5-cyano-2-methyl-4H-pyran-3-carboxylates as well as 2-amino-4-aryl-7-hydroxy-4H-chromene-3 ...
Hamzeh Kiyani, Fatemeh Ghorbani
doaj   +1 more source