Results 311 to 320 of about 2,813,819 (368)
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Small ring chemistry in crop protection
Tetrahedron, 2019Abstract An overview is given of the significance of three- and four-membered rings in crop protection chemistry. The main herbicidally, fungicidally, and insecticidally active small ring derivatives are presented, together with their synthesis routes, modes of action and biological efficacies.
C. Lamberth
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Equilibria in Organo Antimony Ring Chemistry
ChemInform, 1992Reactions of ethyl antimony and n-propyl antimony rings give equilibria with the mixed substituted derivatives R(n-m)R′mSbn (n = 4, m=1-3; n=5, m=1-4; R=Et, R′= n-Pr).
H. Breunig +2 more
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Organofluorine chemistry: A Janus cyclohexane ring.
Nature Chemistry, 2015The first synthesis of the all-cis isomer of 1,2,3,4,5,6-hexafluorocyclohexane, a molecule with one hydrocarbon face and one fluorocarbon face, is a tour de force of organofluorine chemistry and opens up new possibilities for molecular design.
Nico Santschi, R. Gilmour
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Anhydride Ring Chemistry at a Metal Surface
The Journal of Physical Chemistry B, 1998S. Haq +3 more
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Dearomative ring expansion of thiophenes by bicyclobutane insertion
Science, 2023Skeletal ring enlargement is gaining renewed interest in synthetic chemistry and has recently focused on insertion of one or two atoms. Strategies for heterocyclic expansion through small-ring insertion remain elusive, although they would lead to the ...
Huamin Wang +7 more
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Flavonoid B-ring chemistry and antioxidant activity: fast reaction kinetics.
Biochemical and Biophysical Research Communications - BBRC, 2001Rapid scavenging of the model stable radical cation, ABTS(*+), has been applied to screen for the antioxidant activity of flavonoids. The reaction follows two distinct phases.
A. Pannala +3 more
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Ring‐Transformation Graphs in Heterocyclic Chemistry [PDF]
Bulletin des Sociétés Chimiques Belges, 1992 AbstractA novel graph‐theoretical and topological approach is suggested for the description and classification of a great number of simple ring‐transformation reactions of heterocycles. The suggested ring‐bond‐redistribution graphs (which can be easily obtained from the known mechanisms of rearrangements or recyclizations) visualize the degree of ...
Eugeny V. Babaev, Nikolai S. Zefirov
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Soil and tree-ring chemistry response to liming in a sugar maple stand.
Journal of Environmental Quality, 2002An evaluation of the impact of dolomitic lime [CaMg(CO3)2] on soils (five years after treatment) and sapwood chemistry (after four growing seasons) was realized for a Ca-deficient sugar maple stand at the lake Clair watershed.
D. Houle +4 more
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Bioisosteres of the Phenyl Ring: Recent Strategic Applications in Lead Optimization and Drug Design.
Journal of Medicinal Chemistry, 2021The benzene moiety is the most prevalent ring system in marketed drugs, underscoring its historic popularity in drug design either as a pharmacophore or as a scaffold that projects pharmacophoric elements.
Murugaiah A. M. Subbaiah, N. Meanwell
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Chemistry of the solanidane ring system
Journal of the Chemical Society C: Organic, 1971The reaction of acetyldemissidine and acetylsolanidine with cyanogen bromide is described and the results of the lithium aluminium hydride reduction of the bromo-cyanamides so produced are discussed. The hydrolysis of acetyldemissidine bromo-cyanamide under very mild conditions caused a retro-von Braun reaction to afford the initial alkaloid.
J. A. Beisler, Y. Sato
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