نتایج جستجو برای: nitromethane

تعداد نتایج: 403  

2002
Thomas Sommerfeld

Nitromethane is a prototypical example for a molecule that can bind an extra electron in two fundamentally different ways forming dipole-bound as well as valence anions. The classification of the electronic states as dipole-bound or valence does in fact suggest a diabatic viewpoint, and we investigate the coupling between these two electronic states of the nitromethane anion. The coupling eleme...

Journal: :European Journal of Organic Chemistry 2023

A dimeric cyclic cysteine analogue, i. e. (1R,1'R,2R,2'R)-2,2'-disulfanediylbis (aminocyclohexane-1-carboxylic acid), was used as a constrained unnatural amino acid and folding inducer in ultra-short Leu-Val-containing peptide. Our results showed that both free dimer L1 its peptide derivative L2 are able to chelate Cu(II). The obtained complexes resulted be catalytically active Michael addition...

Journal: :Review of Scientific Instruments 2021

A combustion assembly capable of continuously burning monopropellant and bipropellant liquid fuels at pressures up to 80 bars (1145 psig) was designed constructed. The is based on a propellant strand burner where manifold maintains small positive differential the fuel maintain steady supply into reaction vessel. Optical ports enable direct visualization flame will allow for future spectroscopic...

Journal: :Advanced Synthesis & Catalysis 2023

Thiourea-based iminophosphorane (BIMP) organocatalysts featuring SPhos- or BIDIME phosphine units have been developed and successfully applied in the asymmetric addition of nitromethane to N-Boc-protected trifluoromethyl aryl ketimines. α-Trifluoromethyl β-nitroamines were obtained 40–82% isolated yields 80–95% enantioselectivities. A careful evaluation catalytic activity BIMPs indicates that c...

The C-C bond formation is an important reaction in organic synthesis to obtain value-added intermediates. Therefore, in this paper an attempt has been made to accelerate the Henry reaction (C-C bond formation) between aryl aldehydes and nitromethane using less expensive whole cell biocatalyst, baker’s yeast (BY). The scope of the methodology was also tested for the heteryl aldehyde i.e. 2-chlor...

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