Results 71 to 80 of about 2,222 (186)

Exploring Diverse Glycone Preferences of Aspergillus rutinosidases

Advanced Synthesis &Catalysis, Volume 368, Issue 11, 3 June 2026.
Rutinosidases from Aspergillus niger (AnRut) and A. oryzae (AoRut) catalyze hydrolysis and transglycosylation with non‐natural glycosides as donors, enabling glycosylation of alcoholic and phenolic acceptors. AnRut exhibits broad glycone promiscuity, while AoRut has a narrower substrate scope.
Jitka Brouzdová, Lucie Petrásková, Katerina Brodsky, Natalia Kulik, Helena Pelantová, Martina Hurtová, Andrea Vopálenská, Kristýna Slámová, Pavla Bojarová, Vladimír Křen   +9 more
wiley   +1 more source

Part –V: Utilities of Active Methylene Compounds and Heterocycles Bearing Active Methyl or having an Active Methine in the Formation of Nitrogenous Heterocycles Having oxygen or sulfur atom

To Chemistry Journal, 2020
Most of the common and novel synthesized active methylene compounds as well as heterocycles bearing active methyl or having methine site were used in the syntheses of wide variety of five-, six- and seven-membered azaheterocyclic systems having oxygen or
Mohamed Abdel-Megid
doaj  

Chitosan Based Heterogeneous Catalyses: Chitosan-Grafted-Poly(4-Vinylpyridne) as an Efficient Catalyst for Michael Additions and Alkylpyridazinyl Carbonitrile Oxidation

Molecules, 2013
Chitosan-grafted-poly(4-vinylpyridine) (Cs-PVP) copolymers could be synthesized under heterogeneous conditions in presence of a potassium persulfate and sodium sulfite redox system.
Hamad M. Al-Matar, Khaled D. Khalil
doaj   +1 more source

Elastic and electronically inelastic scattering of electrons by 2H-pyran and 4H-pyran molecules

Journal of Applied Physics
We report on elastic and electronically inelastic integral and differential cross sections for electron collisions with the 2H-pyran and 4H-pyran molecules. The scattering calculations were performed with the Schwinger multichannel method and aimed to (i) investigate the formation of resonant states, (ii) assign and compare the resonance spectrum of ...
Murilo O. Silva, Giseli M. Moreira, Márcio H. F. Bettega, Romarly F. da Costa   +3 more
openaire   +1 more source

5-Ureido-3,3-diphenyl-3H-naphtho[2,1-b]pyrans: Photoswitchable self-assembling architectures

International Journal of Photoenergy, 2004
5-Ureido-3,3-diphenyl-3H-naphtho[2,1-b]pyrans have been synthesized and their photochromic properties have been quantified using UV-Visible spectroscopy.
X. Sallenave, S. Delbaere, S. Ahmed, G. Vermeersch, J. L. Pozzo   +4 more
doaj   +1 more source

Dual-site synergistic copper-polyoxoniobate: Ultralow-energy mechanochemical synthesis of bioactive 4H-pyrans

Nano Research
A copper-polyoxoniobate cluster (Cu-PONb) featuring Lewis acid/base dual sites was developed for the ultralow-energy mechanochemical synthesis of pharmacologically relevant 2-amino-3-cyano-4H-pyrans (ACPs).
Jiaqi Qin, Hongrui Tian, Weina Cai, Hui Chen, Zouguang Han, Yanfeng Bi, Baokuan Chen   +6 more
doaj   +1 more source

Contribution of NMR spectroscopy to the mechanistic understanding of photochromism

International Journal of Photoenergy, 2004
Along with classical UV-Visible spectroscopy allowing for the determination of intrinsic properties (λmax,ε), multinuclear NMR spectroscopy is a promising and useful tool for studying photochromic reactions.
S. Delbaere, J. C. Micheau, J. Berthet, G. Vermeersch   +3 more
doaj   +1 more source

Efficient Synthesis of 2-Amino-4H-benzo[b] pyrans via Copper-periodic Mesoporous Organosilica Nanocomposites Catalyst in Aqueous Media

Acta Chimica Slovenica
In this study, the efficient method was introduced for the preparation of copper-periodic mesoporous organosilica nanocomposites (Cu@MOS NCs) as a high performance heterogeneous nanocatalyst. Then the nanocomposite was characterized with various methods
Roghaye Ramazannejad lori, Zahra Fahimeh Alsadat Mortazavi, Vajihe Nejadshafiee, Asadollah Hassankhani   +3 more
doaj   +1 more source

Pyran Polymer [PDF]

, 2020
openaire   +1 more source

Studies in Pyrane Chemistry [PDF]

Journal of the American Chemical Society, 1946
G. Forrest Woods, Herman Sanders
openaire   +1 more source