Results 11 to 20 of about 2,914 (196)

The Challenging P‐Alkylation of Aromatic Phosphorus Heterocycles and Follow‐Up Reactions

open access: yesChemistryEurope
In contrast to the simple and straightforward generation of pyridinium cations, the P‐alkylation of the heavier homolog λ3σ2‐phosphinines is more challenging due to their weak nucleophilicity, as demonstrated only by a handful of examples. The previously
Samantha Frank   +6 more
doaj   +2 more sources

Release of soluble metal ions from copper based dental alloys mesured by ICP-MS [PDF]

open access: yes, 2011
Describes the release of soluble metal ions from copper based dental alloys mesured by ICP-MS.
Ardlin   +5 more
core   +1 more source

The role and effects of glucosinolates of Brassica species - a review

open access: yesPlant, Soil and Environment, 2002
Glucosinolates are the substituted esters of thio amino acids and their synthesis is based on the corresponding amino acids. Methionine and cysteine are the natural donors in the case of the Brassica plants and L-tryptophane in the indole glucosinolates,
H. Zukalová, J. Vašák
doaj   +1 more source

New fused triazinium systems from (alkoxycarbonyl)azinium N-aminides [PDF]

open access: yes, 2007
2-(Alkoxycarbonyl)cycloimmonium N-aminides are efficient 1,4-dipoles that react with different types of reagents such as carbodiimides, benzoyliso(thio)cyanates and heterocyclic imidoyl chlorides to give new heterobetaines containing fused [l,2,4 ...
Bátori   +33 more
core   +3 more sources

Regioselective (thio)carbamoylation of 2,7-di-tert-butylpyrene at the 1-position with iso(thio)cyanates

open access: yesBeilstein Journal of Organic Chemistry, 2017
It has been found that 2,7-di-tert-butylpyrene reacts with aliphatic iso(thio)cyanates in the presence of trifluoromethanesulfonic acid to exclusively afford the corresponding 1-substituted (thio)amides in high yields.
Anna Wrona-Piotrowicz   +3 more
doaj   +1 more source

Seaweed against strontium and preussian blue against cesium

open access: yesRangifer, 1988
The fact that alginates bind strontium and cyanates bind cesium and are capable of removing these elements from living organisms is scientifically verified. Zeolites offer another possibility for exchange of these ions.
G Michanek
doaj   +1 more source

[3,3]-Sigmatropic Rearrangements of Fluorinated Allyl (Thio)cyanates – A Tool for the Synthesis of Fluorinated (Thio)ureas

open access: yesCHIMIA, 2014
The first (thio)cyanate to iso(thio)cyanate rearrangements based on 2-fluoroallylic alcohols are presented. Long-chain 2-fluoroallylic alcohols were converted to corresponding N-unsubstituted carbamates by treatment with trichloroacetyl ...
Daniel C. Ramb, Lisa Kost, Günter Haufe
doaj   +1 more source

Understanding strategy of nitrate and urea assimilation in a Chinese strain of Aureococcus anophagefferens through RNA-seq analysis. [PDF]

open access: yesPLoS ONE, 2014
Aureococcus anophagefferens is a harmful alga that dominates plankton communities during brown tides in North America, Africa, and Asia. Here, RNA-seq technology was used to profile the transcriptome of a Chinese strain of A.
Hong-Po Dong   +5 more
doaj   +1 more source

HENRI FRANÇOIS GAL

open access: yesRevista CENIC Ciencias Químicas, 2023
Henri François Gal (1839-1897), a French chemist who studied in detail the chemical reactions of acid anhydrides, acetyl bromide and chloride, ethers, organic cyanates, organometallic compounds, strychnine and other natural extracts.
Jaime Wisniak
doaj  

Mechanochemical Catalytic Transfer Hydrogenation of Aromatic Nitro Derivatives

open access: yesMolecules, 2018
Mechanochemical ball milling catalytic transfer hydrogenation (CTH) of aromatic nitro compounds using readily available and cheap ammonium formate as the hydrogen source is demonstrated as a simple, facile and clean approach for the synthesis of ...
Tomislav Portada   +2 more
doaj   +1 more source

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