Results 101 to 110 of about 56,210 (306)
Catalytic Annulation of Epoxides with Heterocumulenes by the Indium-Tin System
Molecules, 2018 In the synthesis of five-membered heterocycles by the annulation of epoxides with heterocumulenes such as carbon dioxide and isocyanates, we developed the indium-tin catalytic system and synthesized various cyclic adducts including novel types products ...
Itaru Suzuki +3 more
doaj +1 more source
A class of carbonic anhydrase I – selective activators
Journal of Enzyme Inhibition and Medicinal Chemistry, 2017 A series of ureido and bis-ureido derivatives were prepared by reacting histamine with alkyl/aryl-isocyanates or di-isocyanates. The obtained derivatives were assayed as activators of the enzyme carbonic anhydrase (CA, EC 4.2.1.1), due to the fact that ...
Erol Licsandru +4 more
doaj +1 more source
Isocyanate toughened pCBT: Reactive blending and tensile properties
eXPRESS Polymer Letters, 2013 Cyclic butylene terephthalate oligomers (CBT) were reacted in a ring-opening polymerization with three types of isocyanates: a bifunctional aromatic type, a bifunctional aliphatic type and a polymeric aromatic isocyanate.
T. Abt +3 more
doaj +1 more source
L’expectoration induite, outil de diagnostic de l’asthme professionnel [PDF]
, 2006 Le diagnostic de l’asthme professionnel (AP) repose essentiellement sur la mise en évidence de changements fonctionnels respiratoires consécutifs à une exposition à des agents présents en milieu de travail.
Lemière, Catherine, Malo, Jean-Luc
core +1 more source
The Challenging P‐Alkylation of Aromatic Phosphorus Heterocycles and Follow‐Up Reactions
ChemistryEurope, EarlyView.P‐alkylation of λ3σ2‐phosphinines is hindered by weak nucleophilicity and scarce synthetic access, previously requiring multistep routes or extreme electrophiles. A direct ambient‐condition method is reported using 3,5‐bis(trimethylsilyl)‐phosphinine/B(C6F5)3 with esters or iso(thio)cyanates to generate stable 1‐R‐phosphininium salts.
Samantha Frank +6 more
wiley +1 more source
Development of thermally stable phosphonitrile elastomers for advanced aerospace structures [PDF]
Both high and low molecular weight, curable poly(fluoroalkoxy phosphazene) terpolymers were prepared. These terpolymers resulted from reaction of (Cl2PNn) polymer with alkoxides derived from CF3CH2OH and C3F7CH2OH, and an alkoxide derived from CH3CH(OH ...
Gerber, A. H. +3 more
core +1 more source
New polyurethanes from oxypropylated olive stone [PDF]
, 2012 The purpose of this work is to explore the possibility of chemically modifying the generated polyols (oxypropylated olive stone) through reactions with isocyanates to produce polyurethanes, other than rigid polyurethane foams.
Barbosa, Mariana Martinho +3 more
core
Chemistry – A European Journal, EarlyView.Three 2‐phosphinophenylaluminum dichloride complexes were synthesized and characterized as novel intramolecular FLPs. These FLP systems exhibit high Lewis acidity and effectively activate challenging substrates including aliphatic ketones, imines, and esters. DFT analysis revealed that strain release and Al–P dynamics govern their reactivity. Abstract (
Yoshihiro Nishimoto +2 more
wiley +1 more source
Homochiral Acyl Isocyanates as Diagnostic NMR Probes for the Enantiomeric Purity of Chiral Alcohols
Sultan Qaboos University Journal for Science, 2000 The first reported acyl and sulfonylisocyanates were developed and tested in reactions with chiral alcohols to afford diastereomeric carbamates. NMR analysis of these investigates the chemical shift discrimination that would allow these activated ...
Gregory H. P. Roos, Anthony R. Donovanb
doaj +1 more source