Results 11 to 20 of about 23,225 (270)

Occupational exposure to selected isocyanates in Polish industry

Medycyna Pracy, 2015
Background: Isocyanates constitute a group of highly reactive, low molecular weight chemicals used worldwide for polyurethane manufacturing. The occupational exposure to these compounds is a major cause of occupational asthma, thus it is very important ...
Sławomir Brzeźnicki, Marzena Bonczarowska   +1 more
doaj   +1 more source

Spirometric measurement among polyurethane foam mattress-making workers of India

Indian Journal of Community Medicine, 2021
Background: The polyurethane foam (PUF) mattress-making workers are exposed to isocyanates which are known respiratory toxicants and cause effect on pulmonary volumes and flows.
Rajnarayan Ramshankar Tiwari, Sampathraju Raghavan   +1 more
doaj   +1 more source

Triazolinediones as highly enabling synthetic tools [PDF]

, 2016
Triazolinediones (TADs) are unique reagents in organic synthesis that have also found wide applications in different research disciplines, in spite of their somewhat "exotic" reputation.
Billiet, Stijn, Chattopadhyay, Subrata, De Bruycker, Kevin, Du Prez, Filip, Houck, Hannes, Winne, Johan   +5 more
core   +1 more source

A versatile way for the synthesis of monomethylamines by reduction of N-substituted carbonylimidazoles with the NaBH4/I2 system

Beilstein Journal of Organic Chemistry, 2022
An economical and versatile protocol for the one-pot synthesis of monomethylamines by reduction of N-substituted carbonylimidazoles with NaBH4/I2 in THF at reflux temperature is described. This method used no special catalyst and various monomethylamines
Lin Chen, Xuan Zhou, Zhiyong Chen, Changxu Wang, Shunjie Wang, Hanbing Teng   +5 more
doaj   +1 more source

Synthesis of novel urethanes from a castor oil derived C22-acyloin [PDF]

, 2011
The synthesis of new bio-based chemical building blocks, resulting from the condensation of a renewable C-22 acyloin derived from non-edible castor oil, with mono- and bifunctional isocyanates is reported. The condensation with aliphatic mono-isocyanates
Stevens, Christian, Van der Steen, Marijke, Vilums, Maris   +2 more
core   +2 more sources

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

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

CO2 conversion to phenyl isocyanates by uranium(vi) bis(imido) complexes. [PDF]

, 2020
Uranium(vi) trans-bis(imido) complexes [U(κ4-{(tBu2ArO)2Me2-cyclam})(NPh)(NPhR)] react with CO2 to eliminate phenyl isocyanates and afford uranium(vi) trans-[O[double bond, length as m-dash]U[double bond, length as m-dash]NR]2+ complexes, including [U(κ4-
Bandeira, Nuno AG, Gibson, John K, Maria, Leonor, Marçalo, Joaquim, Santos, Isabel C   +4 more
core   +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