Results 31 to 40 of about 5,225 (230)

[3+3]-Annulation of Cyclic Nitronates with Vinyl Diazoacetates: Diastereoselective Synthesis of Partially Saturated [1,2]Oxazino[2,3-b][1,2]oxazines and Their Base-Promoted Ring Contraction to Pyrrolo[1,2-b][1,2]oxazine Derivatives

Molecules, 2023
A rhodium(II)-catalyzed reaction of cyclic nitronates (5,6-dihydro-4H-1,2-oxazine N-oxides) with vinyl diazoacetates proceeds as a [3+3]-annulation producing bicyclic unsaturated nitroso acetals (4a,5,6,7-tetrahydro-2H-[1,2]oxazino[2,3-b][1,2]oxazines ...
Yulia A. Antonova, Yulia V. Nelyubina, Sema L. Ioffe, Andrey A. Tabolin   +3 more
doaj   +1 more source

Extending Human Perception of Electromagnetic Radiation to the UV Region through Biologically Inspired Photochromic Fuzzy Logic (BIPFUL) Systems. [PDF]

, 2015
Photochromic Fuzzy Logic Systems have been designed that extend human visual perception into the UV region. The systems are founded on a detailed knowledge of the activation wavelengths and quantum yields of a series of thermally reversible photochromic ...
Albus, Albus, Amanda L. Rightler, B. Mark Heron, Brou, Christopher D. Gabbutt, Conway, Delbaere, di Nunzio, Gegenfurtner, Gentili, Gentili, Gentili, Gentili, Gentili, Gust, Hepworth, Hunt, Lennie, Li, Ling, Lokshin, Ludlow, Maafi, Marshall, Monroy, Pier Luigi Gentili, Solomon, Sung, Szaciłowski, Tovée, Wu, Zadeh, Zadeh, Zeki, Zeki   +35 more
core   +1 more source

One-pot synthesis of naphtho[1,2-e][1,3]oxazines in the presence of FNAOSiPAMP*/CuII as an almond shell based nanocatalyst

Scientific Reports, 2022
In the present research work, a novel catalyst based on natural material, namely, Fe3O4@nano-almondshell@OSi(CH2)3/NHCH2pyridine/CuII abbreviated (FNAOSiPAMP/CuII) was designed and prepared.
Mina Keihanfar, Bi Bi Fatemeh Mirjalili
doaj   +1 more source

Practical Broad-Band Tuning of Dye Lasers by Solvent Shifting [PDF]

, 1986
We have operated a dye laser over a broad wavelength range (593.8-667.0nm) by shifting the dye emission profile with incremental changes of solvent composition. This was accomplished with the laser operating continuously, and only minor adjustment of the
Bird, George R., Grenci, Susan M., Keelan, Brian W., Zewail, Ahmed H.   +3 more
core   +1 more source

Photo-responsive graphene and carbon nanotubes to control and tackle biological systems [PDF]

, 2018
Photo-responsive multifunctional nanomaterials are receiving considerable attention for biological applications because of their unique properties. The functionalization of the surface of carbon nanotubes (CNTs) and graphene, among other carbon based ...
Cardano, Francesca, Frasconi, Marco, Giordani, Silvia   +2 more
core   +1 more source

Photochromic organic-inorganic hybrid nanocomposite hard coatings with tailored fast switching properties [PDF]

, 1999
A recently developed photochromic organic-inorganic nanocomposite (Nanomer) coating system is investigated, which is based on an epoxysilane as network former, different bisepoxides as spacer and an organic amine as thermal cross-linker.
Fries, Kira, Mennig, Martin, Schmidt, Helmut K.   +2 more
core   +2 more sources

Carbohydrate-auxiliary assisted preparation of enantiopure 1,2-oxazine derivatives and aminopolyols

Beilstein Journal of Organic Chemistry, 2012
An approach to enantiopure hydroxylated 2H-1,2-oxazine derivatives is presented utilizing the [3 + 3] cyclisation of lithiated alkoxyallenes and an L-erythrose-derived N-glycosyl nitrone as precursors.
Marcin Jasiński, Dieter Lentz, Hans-Ulrich Reissig   +2 more
doaj   +1 more source

Thermoresponsive Poly(2‐oxazine)s

Macromolecular Rapid Communications, 2011
AbstractThe monomers 2‐methyl‐2‐oxazine (MeOZI), 2‐ethyl‐2‐oxazine (EtOZI), and 2‐n‐propyl‐2‐oxazine (nPropOZI) were synthesized and polymerized via the living cationic ring‐opening polymerization (CROP) under microwave‐assisted conditions. pEtOZI and pnPropOZI were found to be thermoresponsive, exhibiting LCST behavior in water and their cloud point ...
Bloksma, M.M., Paulus, R.M., Kuringen, van, H.P.C., Woerdt, van der, F., Lambermont - Thijs, H.M.L., Schubert, U.S., Hoogenboom, R.   +6 more
openaire   +3 more sources

One-pot nucleophilic substitution–double click reactions of biazides leading to functionalized bis(1,2,3-triazole) derivatives

Beilstein Journal of Organic Chemistry, 2023
The nucleophilic substitution of benzylic bromides with sodium azide was combined with a subsequent copper-catalyzed (3 + 2) cycloaddition with terminal alkynes.
Hans-Ulrich Reissig, Fei Yu
doaj   +1 more source

A unified criterion for the local uniform convergence of the density of the maximum [PDF]

, 1992
A unified criterion is proposed for the uniform convergence in compact subsets of the real line of the density of linearly normalized maximum of independent identically distributed random ...
Mohan, N.R.
core   +1 more source