Isocyanate - Wikipedia
Three rearrangement reactions involving nitrenes give isocyanates: Schmidt reaction, a reaction where a carboxylic acid is treated with ammonia and hydrazoic acid yielding an isocyanate. Curtius rearrangement degradation of an acyl azide to an isocyanate and nitrogen gas.
A brief overview of properties and reactions of diisocyanates
2022年5月8日 · In the case of diisocyanates, the reactivity of the isocyanate (−N=C=O, or NCO) functional group toward water and biological (macro)molecules and the resulting reaction products are key. Therefore, the second part of this overview summarizes the most relevant diisocyanate reactions and provides some insight into their toxicological implications.
Isocyanate - an overview | ScienceDirect Topics
The mechanism for isocyanate reactions consists in the nucleophilic addition of an active hydrogen (AH) compound to the electron-poor carbonyl atom of isocyanate (Figure 20). A broad range of hydrogen-containing nucleophiles react with both aromatic and aliphatic isocyanates.
Flourishing reactivities of isocyanates and isothiocyanates using …
2023年12月20日 · This mini review will highlight the use of several group 13 compounds (boron, aluminum, and gallium) by exploring the remarkable stoichiometric reactions of isocyanates and isothiocyanates involving C=O (S) vs. C=N adduct formation along with the growth of the versatile catalytic transformations using isocyanates and isothiocyanates.
Thiol –isocyanate “click” reactions: rapid development of …
Functional, micropatterned and multicomponent polymer brush surfaces can be rapidly fabricated via base-catalyzed thiol –isocyanate “click” reactions. Applications for advanced functional polymeric surfaces that possess precisely engineered properties are expanding rapidly.
Organic Chemistry/Isocyanate - Wikibooks
2023年6月7日 · Isocyanates are usually produced by reacting an amine with phosgene (COCl2): They are very reactive molecules, reacting with nucleophiles such as water, alcohols or amines. The reactions involve attack at the carbon of the isocyanate in a manner similar to that for carboxylic acid derivates such as esters or anhydrides.
In the case of diisocya-nates, the reactivity of the isocyanate ( N=C=O, or NCO) functional group toward water and biological (macro)molecules and the resulting reaction products are key. Therefore, the second part of this overview summarizes the most relevant diisocyanate reactions and provides some insight into their toxicological implications.
Catalyzed reaction of isocyanates (RNCO) with water
The reactions between substituted isocyanates (RNCO) and other small molecules (e.g. water, alcohols, and amines) are of significant industrial importance, particularly for the development of novel polyurethanes and other useful polymers. We present very high-level ab initio computations on the HNCO + H2O re
Isocyanates in polyaddition processes. Structure and reaction ...
2001年6月1日 · The isocyanate group has a structure belonging to the heterocumulene class, and represents a strained structure able to perform addition reactions when interacting with different compounds that can be generally considered as phyloisocyanaic reaction partners.
Catalytic Effects in Isocyanate Reactions - ScienceDirect
This chapter describes the catalytic effects in isocyanate reactions including polymerization of isocyanates, reactions of isocyanates with compounds containing active hydrogen, and their applications. Isocyanates react with compounds, which give a positive Zerewitinoff test.