Results 21 to 30 of about 48,553 (267)

Reactivity of Isocyanate-Functionalized Lignins: A Key Factor for the Preparation of Lignin-Based Polyurethanes

Frontiers in Chemistry, 2019
Using isocyanate-functionalized Kraft lignin as a reactive macromonomer for the preparation of polyurethane foams by a prepolymer technique is a well-known strategy to incorporate the biomacromolecule into a higher value polymer material.
Mareike Zieglowski, Simon Trosien, Jochen Rohrer, Sabrina Mehlhase, Simone Weber, Kerstin Bartels, Gregor Siegert, Taina Trellenkamp, Karsten Albe, Markus Biesalski   +9 more
doaj   +1 more source

Direct Access to Chiral Secondary Amides by Copper-Catalyzed Borylative Carboxamidation of Vinylarenes with Isocyanates.

Journal of the American Chemical Society, 2019
A Cu-catalyzed borylative carboxamidation reaction has been developed using vinylarenes and isocyanates. Alkynes, branched 1,3-dienes and bicyclic alkenes were also found to be competent coupling partners.
Daniele Fiorito, Yangbin Liu, C. Besnard, C. Mazet   +3 more
semanticscholar   +1 more source

Investigations of catalysis of urethane formation using organotin dicarboxylate

Heliyon, 2020
The reaction mechanism of the urethane formation for both aliphatic and aromatic isocyanates in the presence of organotin dicarboxylate as a catalyst is investigated theoretically and experimentally.
Ransi Devendra, Neil R. Edmonds, Tilo Söhnel   +2 more
doaj   +1 more source

Elimination kinetics of diisocyanates after specific inhalative challenges in humans: mass spectrometry analysis, as a basis for biomonitoring strategies

Journal of Occupational Medicine and Toxicology, 2011
Background Isocyanates are some of the leading occupational causes of respiratory disorders, predominantly asthma. Adequate exposure monitoring may recognize risk factors and help to prevent the onset or aggravation of these aliments.
Lemiere Catherine, Merget Rolf, Nowak Dennis, Budnik Lygia T, Baur Xaver   +4 more
doaj   +1 more source

Modeling of Isocyanate Synthesis by the Thermal Decomposition of Carbamates

Computation, 2020
The presented work is devoted to isocyanate synthesis by the thermal decomposition of carbamates model. The work describes the existing isocyanate-obtaining processes and the main problems in the study of isocyanate synthesis by the thermal decomposition
Ratmir Dashkin, Georgii Kolesnikov, Pavel Tsygankov, Igor Lebedev, Artem Lebedev, Natalia Menshutina, Khusrav Ghafurov, Abakar Bagomedov   +7 more
doaj   +1 more source

PECULIARITIES OF ISOCYANATES INTERACTION WITH HYDRAZINE DERIVATIVES

Тонкие химические технологии, 2018
The results of studies on chemical transformations of organic and organosilicon isocyanates in their interaction with hydrazine derivatives have been summarized in this review.
A. D. Kirilin, L. O. Belova, N. I. Kirilina, A. V. Petrogradsky, N. L. Shembel   +4 more
doaj   +1 more source

Synthesis of 3-Trifluoromethyl-5,6-dihydro-[1,2,4]triazolo Pyrazine Derivatives and Their Anti-Cancer Studies

Molbank, 2020
The synthesis of a wide variety of 3-trifluoromethyl-5,6-dihydro-[1,2,4]triazolo pyrazine derivatives, by the treatment of 3-trifluoromethyl-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-α]pyrazine hydrochloride with an array of isocyanates in the presence of ...
Rajaiah Raveesha, Malavalli Guruswamy Dileep Kumar, Salekoppal Boregowda Benaka Prasad   +2 more
doaj   +1 more source

Nanoencapsulation of blocked isocyanates through aqueous emulsion polymerization

eXPRESS Polymer Letters, 2008
Blocked isocyanates were successfully encapsulated into polystyrene and hydroxyl and amine functionalized polymeric nanospheres via emulsion polymerization.
doaj   +1 more source

One-pot sequential synthesis of isocyanates and urea derivatives via a microwave-assisted Staudinger–aza-Wittig reaction

Beilstein Journal of Organic Chemistry, 2013
A fast and efficient protocol for the synthesis of N,N'-disubstituted urea derivatives from alkyl halides and primary or secondary amines has been developed.
Diego Carnaroglio, Katia Martina, Giovanni Palmisano, Andrea Penoni, Claudia Domini, Giancarlo Cravotto   +5 more
doaj   +1 more source

Toward Circular Recycling of Polyurethanes: Depolymerization and Recovery of Isocyanates

JACS Au
We report a depolymerization strategy to nearly quantitatively regenerate isocyanates from thermoplastic and thermoset polyurethanes (PUs) and then resynthesize PUs using the recovered isocyanates.
Robert M. O'Dea, Mridula Nandi, Genevieve Kroll, Jackie Arnold, L. Korley, Thomas H. Epps   +5 more
semanticscholar   +1 more source