Mixed oxide-sulfide nickel ore is becoming the major source of nickel produced in the nickel smelting enterprise due to the increasing global demand of nickel and the depletion of high-grade nickel sulfide ore. Low temperature roasting technique by ammonium sulfate is a potential cleaner product...

Ogden Air Logistics Center (OO-ALC) is the primary facility within the United States Air Force for maintaining and overhauling aircraft landing gear. Aluminum landing gear components are anodized at OO-ALC to provide enhanced corrosion resistance, paint adhesion, and wear resistance; a sodium di...

Photocatalytic production of hydrogen has been investigated over irradiated aqueous dispersions of mixed Cd-Zn sulfide catalysts (CZS) promoted with nickel or nickel phosphide in the presence of sulfide/sulfite ions as sacrificial electron donors. The CZS composites were prepared by a co-precipi...

RésuméLa chéilite allergique de contact est une affection relativement fréquente. Le sulfate de nickel est l’allergène le plus fréquemment retrouvé lors de l’exploration des dermatites de contact. Nous rapportons 2 observations de chéilite allergique au sulfate de nickel à mode de ré...

This chapter reviews nickel complexes with carbonyl, isocyanide, and carbene ligands. Among the complexes discussed are mononuclear, dinuclear, and higher cluster complexes corresponding to these ligands. Theoretical and physical studies of nickel carbonyls, isocyanides, and carbenes and their c...

The organophosphine catalyzed reaction of activated alkynes with isocyanides produces the corresponding heteroaromatization products, pyrroles, regioselectively in good yields. The reaction proceeds most probably through the 1,4-addition of the nucleophilic phosphine catalyst to the alkynes, fol...

Novel dinuclear palladium complexes having two isocyanide ligands were synthesized by using a binucleating ligand, N,N′-bis[2-(diphenylphsphino)phenyl]formamidinate (dpfam). The structure of [Pd2(μ-dpfam)(tert-BuNC)2]Cl was confirmed by X-ray analysis, showing that the Pd–Pd bond length of 2....

N-Alkyloxazolidines react in a multicomponent reaction with carboxylic acids and isocyanides to give N-acyloxyethylamino acid amides. The previously reported reaction conditions were improved using a design of experiments approach (DoE). Under the optimised conditions, good yields of the N-acylo...

3H-Naphtho[2.1-b]pyran-2-carboxamides (3H-Benzo[f]chromene-2-carboxamides) can be synthesized from a three-component cyclocoupling reaction of β-naphthol, propargyl alcohols and isocyanide in the presence of ZnI2 and FeCl3 under air atmosphere. The reaction is proposed to involve the formation ...

A new synthesis of perfluoro-tert-butyl chloroformate (perfluoro-tert- butoxycarbonyl chloride) is based on the reaction of potassium perfluoro- tert-butoxide with one equivalent of phosgene in xylene or mesitylene. Perfluoro-tert-butyl chloroformate reacts readily with hydroxy, sulfhydryl and a...

Four highly-fluorinated alkyl and aryl chloroformates, including 2,2,3,3,4,4,5,5-octafluoro-1-pentyl chloroformate (OFPCF), 2,3,4,5,6-pentafluorobenzyl chloroformate (PFBCF), 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octyl chloroformate (TDFOCF), and 2-(2,3,4,5,6-pentafluorophenoxy)-ethyl chloro...

SummaryThe chloroformate chemistry of AAs is reviewed taking different aspects into account such as reactivity, method constructions, automation, sensitivity, detector arrangements, sample matrix problems. The exceptional vigourous derivatization reaction is sensitive to pH and buffer capacities...

Hexabutylguanidinium chloride (0.5 molar %) efficiently decomposes alkyl chloroformates into chlorides, with low alkenes formation, via a SN2 mechanism as demonstrated from substituents effects and asymmetric chloride synthesis.

Silica-supported hexaalkylguanidinium (SiGCl), tetraalkylammonium (SiNCl) and tetraalkylphosphonium (SiPCl) chlorides were tested and compared for the obtention of chloroalkanes from chloroformates through a SN2 pathway. The superiority of SiGCl appears clearly from the collected data. Conversio...

Full details are given for a modified Mitsunobu approach to the formation of N-alkylated 1,2,4-dithiazolidine-3,5-diones 2 from a wide range of alcohols 10 with predominantly, inversion of configuration. The resulting products 2 can be regarded as protected isocyanates 6.

The isocyanate-based polymers, including polyurethanes, polyureas, polyisocyanurates, and their copolymers, are found in the broadest range of applications. This comes from the high reactivity of the isocyanate group with any of the number of active hydrogen-containing molecules, of which the po...

Production of polyurethane is increasing since the recent years. Nevertheless, this production uses hazardous chemicals, which is isocyanate. Academy has put a lot of effort to develop some non-isocyanate polyurethane routes. One of the most promising is the aminolysis of cyclic-carbonate by dia...

This study examined the emissions of powerful asthmatic agents called isocyanates from small-scale pyrolysis experiments of two common foams employed in mattress production such as flexible polyurethane foam (FPUF) and viscoelastic memory foam (VMF). A nitrogen atmosphere and five different temp...

Isocyanates are widely used in many different areas, but the most common synthesis route-phosgene route cannot fit the more and more rigorous restriction of safety and environment. Here, a facile synthesis method of isocyanates via amines and carbonyl fluoride is proven feasibly by expanding its...

The present study describes the preparation of non-isocyanate polyurethane nanoparticles by nanoprecipitation. The protocol consists in the dropwise addition of a previously prepared poly(hydroxy)urethane (PHU) organic solution into permuted water. PHU synthesis was performed by polyaddition rea...