Results 31 to 40 of about 14,073 (324)

Intramolecular Nitrile Oxide−Alkene Cycloaddition of Sugar Derivatives with Unmasked Hydroxyl Group(s)

, 2016
Intramolecular nitrile oxide−alkene cycloaddition (INOC) of sugar derivatives with one to four free hydroxyl group(s) is reported. The INOC reaction, using chloramine-T, in the presence of silica gel, to generate nitrile oxides from oximes, proceeded ...
Wun S. Kwok (2340364), Wai F. Wong (2429785), Tony K. M. Shing (2134180), Hau M. Cheng (2134183), King H. So (2195041)   +4 more
core   +6 more sources

[3+2] Cycloaddition to a Chiral 5-Methylene-1,3-dioxolan-4-one and Pyrolysis of the Spiro Adducts

Molecules
The [3+2] cycloaddition chemistry of (2S)-5-methylene-2-t-butyl-1,3-dioxolan-4-one, derived from lactic acid, has been examined, and spiro adducts have been obtained with benzonitrile oxide, acetonitrile oxide, diazomethane and diphenyldiazomethane.
R. Alan Aitken, Lynn A. Power, Alexandra M. Z. Slawin   +2 more
doaj   +1 more source

Conversion of Oximes to Carbonyl Compounds by Triscetylpyridinium Tetrakis(oxodiperoxotungsto) Phosphate (PCWP)-mediated Oxidation with Hydrogen Peroxide

Molecules, 2008
Aromatic and aliphatic oximes have been deoximated in chloroform-water to the corresponding aldehydes with dilute hydrogen peroxide and triscetylpyridinium tetrakis (oxodiperoxotungsto) phosphate as catalyst.
Rosa M. Toscano, Gaetano Tomaselli, Antonio Rescifina, Ugo Chiacchio, Francesco P. Ballistreri   +4 more
doaj   +1 more source

Controllable cyanation of carbon-hydrogen bonds by zeolite crystals over manganese oxide catalyst

Nature Communications, 2017
Sustainable strategies for nitrile synthesis are needed. Here, the authors report an environmentally benign, selective heterogeneous catalyst for the synthesis of nitriles by the oxidative cyanation of carbon and hydrogen (C-H) bonds, which comprises ...
Liang Wang, Guoxiong Wang, Jian Zhang, Chaoqun Bian, Xiangju Meng, Feng-Shou Xiao   +5 more
doaj   +1 more source

A Weinreb Nitrile Oxide and Nitrone for Cycloaddition

, 2016
The cycloaddition of Weinreb amide functionalized nitrile oxide/nitrones with a range of dipolarophiles has been ...
Richard W. Franck (2704003), Ajit K. Parhi (1882945)   +1 more
core   +1 more source

The effect of zinc oxide nanoparticle morphology on activity in crosslinking of carboxylated nitrile elastomer

eXPRESS Polymer Letters, 2009
The aim of this work was to study the activity of several nanosized zinc oxides in the crosslinking of carboxylated nitrile elastomer (XNBR). In this article, we discuss the effect of zinc oxide nanoparticles with respect to their specific surface area ...
doaj   +1 more source

Combined experimental and theoretical studies of regio- and stereoselectivity in reactions of β-isoxazolyl- and β-imidazolyl enamines with nitrile oxides

Beilstein Journal of Organic Chemistry, 2016
Reactions of β-azolyl enamines and nitrile oxides were studied by both experimental and theoretical methods. (E)-β-(4-Nitroimidazol-5-yl), (5-nitroimidazol-4-yl) and isoxazol-5-yl enamines smoothly react regioselectively at room temperature in dioxane ...
Ilya V. Efimov, Marsel Z. Shafikov, Nikolai A. Beliaev, Natalia N. Volkova, Tetyana V. Beryozkina, Wim Dehaen, Zhijin Fan, Viktoria V. Grishko, Gert Lubec, Pavel A. Slepukhin, Vasiliy A. Bakulev   +10 more
doaj   +1 more source

Chiral Lewis Acid Catalysis in Nitrile Oxide Cycloadditions

, 2016
We describe examples of highly regio- and enantioselective nitrile oxide cycloadditions to unsaturated alkenes using substoichiometric amounts of a chiral Lewis acid.
Mukund P. Sibi (1633159), Kennosuke Itoh (1574884), Craig P. Jasperse (1633156)   +2 more
core   +1 more source

Side-chain Modifications of Highly Functionalized 3(2H)-Furanones

Molecules, 2012
A series of 3(2H)-furanones, based on side-chain modifications of a parent 3(2H)-furanone, was synthesized in good yield. The parent compound was prepared by hydrogenolysis, and subsequent acid hydrolysis, of isoxazole derivatives.
Gil Valdo José da Silva, Maurício Gomes Constantino, Viviani Nardini, Shirley Muniz Machado Rodrigues   +3 more
doaj   +1 more source

Sudden anaerobization in Amphibacillus xylanus increases intracellular labile ferrous iron and inhibits cell growth

FEBS Open Bio, EarlyView.
Abruptly changing from aerobic to anaerobic conditions (sudden anaerobization) induced growth inhibition and a significant increase in intracellular labile ferrous iron in the aerotolerant anaerobe Amphibacillus xylanus. We found that free flavins mediate efficient electron transfer from NADH to ferric iron under anaerobic conditions, suggesting that ...
Shinya Kimata, Yoichi Sakai, Keisuke Tanaka, Etsuro Yoshimura, Ken Kitano, Morio Ishikawa, Tadahiro Nakamoto, Tsutomu Takayama, Hirofumi Inoue, Kaho Nomura, Tomonori Suzuki, Masataka Uchino, Akira Abe, Youichi Niimura   +13 more
wiley   +1 more source