Cycloisomerization of Conjugated Trienones and Isomeric 2H‑Pyrans: Unified Strategy toward Cyclopenta[b]furans [PDF]
, 2015 Conjugated trienones and isomeric 2H-pyrans were found to engage in a novel cycloisomerization cascade toward cyclopenta[b]furan derivatives.
Mirta P. Mischne (1554727) +4 more
core +1 more source
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
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable Organocatalyst [PDF]
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable ...
Farhad Shirini (703231) +3 more
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Control of the Fading Properties of Photochromic 3,3-Diaryl-3H-naphtho- [2,1-b]pyrans [PDF]
, 2003 The synthesis and spectroscopic properties of some novel photochromic 3H-naphtho[2,1-b]pyrans are reported. Varying the size of an ortho-substituent on one of the geminal aryl rings allows the rate of fade of the photogenerated color to be ...
Gabbutt, Christopher D. +2 more
core +1 more source
Synthesis and photochromic properties of substituted 3H-naphtho [2,1-b] pyrans [PDF]
, 2004 The synthesis and spectroscopic properties of novel 3H-naphtho[2, 1-b]pyrans are described. Subtle variation of the colour of the photo-generated merocyanine dyes derived from these naphthopyrans can be accomplished by controlling the steric interactions
Hursthouse, Michael B. +9 more
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Metalation of Pyrans and Dihydropyridines : When is an 8pi-System Cost Effective ? [PDF]
The pyrans I (R = Me, H; R1 = H) with BuLi/KOCMe3 or KSiMe3 gave the 2-metalated derivs. I (R1 = K), which reacted with alkyl halides to give I (R = H, Me; R1 = Me, Et, SiMe3, CH2SiMe3); thus the behavior the 4H-pyrans toward organometallic reagents is ...
Schneider, Philippe, Schlosser, Manfred
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Nano ResearchA 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 +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 +3 more
doaj +1 more source
Synthesis and photochromic properties of tri- and tetra-aryl-3H-naphtho[2,1-b]pyrans [PDF]
, 2011 The objective of this study was to investigate the influence of 6-aryl-, 5-aryl- and 5,6-diaryl- substituents upon the photochromic properties [A-max and fading kinetics (tv,)] of 3,3-diaryl-3H- naphtho[2,1-b]pyrans.
Kershaw, Christopher Stephen
core
Elastic and electronically inelastic scattering of electrons by 2H-pyran and 4H-pyran molecules
Journal of Applied PhysicsWe 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 +3 more
openaire +1 more source