Results 141 to 150 of about 217,585 (392)

(6R,7R)-3-Hydroxymethyl-7-(2-phenylacetamido)-3-cephem-4-carboxylic acid lactone

open access: yesActa Crystallographica Section E, 2011
In the title compound {systematic name: N-[(4R,5R)-3,11-dioxo-10-oxa-6-thia-2-azatricyclo[6.3.0.02,5]undec-1(8)-en-4-yl]-2-phenylacetamide}, C16H14N2O4S, the four- and five-membered rings adopt planar conformations (with r.m.s. deviations of 0.0349 and 0.
Xiao-Liang Zhou   +3 more
doaj   +1 more source

12-Methyl-omega-tridecanolide, A New Macrocyclic Lactone from Angelica Root Oil. [PDF]

open access: bronze, 1975
Jyrki Taskinen   +5 more
openalex   +1 more source

In Vitro Metabolism of Helenalin Acetate and 11α,13-Dihydrohelenalin Acetate: Natural Sesquiterpene Lactones from Arnica [PDF]

open access: gold, 2022
Franziska M. Jürgens   +4 more
openalex   +1 more source

Chemical Methods for Peptide and Protein Backbone Cleavage

open access: yesChemistryEurope, EarlyView.
Protein cleavage plays essential roles in biology and is powerful for protein manipulation and functionalization as well as in recombinant expression and purification. Here, the historical background and most recent examples of chemical methods for protein and peptide backbone cleavage are discussed (part of the figure was generated in BioRender).
Miguel Angel Alena‐Rodriguez   +1 more
wiley   +1 more source

Solvent‐Driven Pore Engineering in Coffee‐Derived Activated Hydrochar: Implications for Post‐Combustion CO2 Capture

open access: yesCarbon Energy, EarlyView.
Solvent washing of coffee‐ground hydrochars produces activated carbons with tunable pore sizes while maintaining surface area. Removing non‐polar contaminants enhances microporosity, increasing CO2 uptake by 40%. Moderate pore sizes (9–12 Å) yield optimal CO2:N2 selectivity, whereas smaller pores reduce selectivity due to stronger interactions between ...
Muhammad Irfan Maulana Kusdhany   +4 more
wiley   +1 more source

Sesquiterpene lactones isolated from a medicinal plant of the Venezuelan Andes [PDF]

open access: bronze, 2008
Jaime Delgado   +4 more
openalex   +1 more source

Chemistry and Biology of Streptogramin A Antibiotics [PDF]

open access: yes, 2007
The streptogramin A antibiotics have proven to be highly active against Gram positive bacteria, particularly methicillin-resistant Staphylococcus aureus. Members of this group of compounds are characterized by a 23-membered macrocycles containing polyene,
Ahmed, Fahim, Donaldson, William
core   +1 more source

One‐Pot Transition‐Metal‐Free Methods for the Synthesis of All Three Bonds of the Alkyne's Triple Bond

open access: yesChemistry – A European Journal, EarlyView.
One‐pot transition‐metal‐free methods for the synthesis of all three bonds of the alkyne's triple bond are reviewed. After analysis of several named reactions and discussion of improvements, recent advances in the synthesis of alkynes are discussed. Each section contains a proposed reaction mechanism and analysis of the strengths and weaknesses of the ...
Eugene Kim   +4 more
wiley   +1 more source

Photoinduced, Chemoselective γ‐Alkylation of 2‐Silyloxyfurans with α‐Bromoketones: A Rapid Entry to Chiral ε‐Keto‐γ‐Butenolides

open access: yesChemistry – A European Journal, EarlyView.
A photoinduced, regio‐ and chemoselective γ‐alkylation of 2‐silyloxyfurans with a‐bromoketones was achieved by exploiting a photoredox catalytic process promoted by blue light. This approach provides practical and efficient access to chiral, ε‐ketobutenolides, in one step and high yields.
Debora Guazzetti   +9 more
wiley   +1 more source

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