نتایج جستجو برای: anhydrides

تعداد نتایج: 2251  

Journal: :Catalysis Science & Technology 2022

For the first time, palladium-catalyzed carbonylative telomerization enables one-step synthesis of mixed carboxylic anhydrides directly from butadiene. These are versatile intermediates and were used to form amides.

Journal: :Macromolecules 2021

Poly(ester-carbonate) copolymers were synthesized through triethylborane (TEB)-activated, one-pot copolymerization of epoxides with anhydrides (AH) and CO₂. Depending upon the feeding ratio AH to epoxides, poly(ester-carbonate) random tapered ester structures could be derived due much higher reactivity toward growing oxanions compared Anhydrides like succinic anhydride (SA) phthalic (PA) when t...

Journal: :British journal of industrial medicine 1991
C B Chee H S Lee T H Cheong Y T Wang S C Poh

Hexahydrophthalic anhydride (HHPA) belongs to the family of acid anhydrides, the members of which are reactive organic chemicals of low molecular weight widely used in alkyd and epoxy resins. The major toxic effects ofthe acid anhydrides are mucosal and skin irritation and respiratory hypersensitivity, particularly asthma. Most of the reported cases of asthma caused by acid anhydrides were due ...

Journal: :Acta Chemica Scandinavica 1973

2017
Marta Tena-Solsona Benedikt Rieß Raphael K Grötsch Franziska C Löhrer Caren Wanzke Benjamin Käsdorf Andreas R Bausch Peter Müller-Buschbaum Oliver Lieleg Job Boekhoven

Many biological materials exist in non-equilibrium states driven by the irreversible consumption of high-energy molecules like ATP or GTP. These energy-dissipating structures are governed by kinetics and are thus endowed with unique properties including spatiotemporal control over their presence. Here we show man-made equivalents of materials driven by the consumption of high-energy molecules a...

Journal: :Nucleic acids research 1978
V. L. Drutsa V. F. Zarytova D. G. Knorre A. V. Lebedev N. I. Sokolova Z. A. Shabarova

It has been demonstrated with the use of 31P NMR pulsed spectroscopy that the reaction of mesitoyl chloride (MsCOCl) both with terminal and internucleotide phosphate groups pA, d(MeOTr)TpT and dpTpT (Ac) proceeds in a quantitative fashion within less than 2 min at 0 degrees C with the respective mixed anhydrides being thereby formed. The anhydrides of phosphomonoesters are resistant, unlike tho...

Journal: :Chemical communications 2015
Rashmi Prakash Kommuri Shekarrao Sanjib Gogoi Romesh C Boruah

A novel ruthenium catalyzed straightforward and efficient synthesis of isocoumarin and α-pyrone derivatives has been accomplished by the decarbonylative addition reaction of anhydrides with alkynes under thermal conditions.

2014
Padam Praveen Kumar Y Dathu Reddy Y Bharathi Kumari B Rama Devi P K Dubey

Phthalic, maleic and succinic anhydrides have been reacted with aromatic amines to obtain the corresponding monoacid monoamides. The latter have been each transformed into the corresponding cyclic imide derivatives by treating with SOCl2. Alternatively, anhydrides have been reacted with methanolic KOH to obtain monomethyl ester derivatives which on reaction with aromatic amines in the presence ...

Journal: :Green Chemistry 2022

Starting from anilines and anhydrides a range of aminooxo-acids were prepared with excellent yields reaction times using an acyltransferase M. smegmatis (MsAcT) in water. Applying this process key intermediate SAHA was synthesized.

2012
Di Chen Ai-Ping Zhang Chuan-Fu Liu Run-Cang Sun

Bagasse acetate butyrates were prepared homogeneously in 1-butyl-3methylimidazolium chloride ([C4mim]Cl) ionic liquid from ball-milled sugarcane bagasse by acylation with acetic anhydride and butyric anhydride. The parameters, including reaction temperature, reaction time, feeding method of adding anhydrides, the dosage of total anhydrides to SCB, and the molar ratio of acetic anhydride to buty...

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