Results 171 to 180 of about 166,153 (407)
Dust evolution, a global view: IV. Tying up a few loose ends [PDF]
arXiv, 2018 This work is an attempt to tie together some of the, seemingly disparate, loose ends from the preceding papers in this series into the global view of dust evolution in the interstellar medium. In particular, the nature of the hydro-carbonaceous, infrared absorption and emission band carriers is discussed within the context of a simple poly- hexa-cyclic
arxiv
Utilization of oxygen difluoride for syntheses of fluoropolymers [PDF]
, 1976 The reaction oxygen difluoride, OF2, with ethylenically unsaturated fluorocarbon compounds is examined. Depending upon the fluorocarbon material and reaction conditions, OF2 can chain extend fluoropolyenes, convert functional perfluorovinyl groups to ...
Toy, M. S.
core +1 more source
Syntheses of Chiral 2-Oxazolines from Isosorbide Epoxide Derivative
MolbankTwo chiral monooxazolines were synthesized from a secondary amino alcohol, as a key intermediate, isolated in four steps from an isosorbide-derived epoxide.
Mohammed Kadraoui +2 more
doaj +1 more source
Reactions of p-Nitrophenyloxirane with Amines Containing Fragments with Bicyclic Skeleton [PDF]
, 2002 Reactions of p-nitrophenyloxirane with amines containing fragments with bicyclic skeleton of norbornene, norbornane, epoxynorbornane (stereoisomeric exo- and endo-5-aminomethylbicyclo[2.2.1]hept-2-enes, N-benzyl-endo-5-aminomethylbicyclo[2.2.1]hept-2-ene,
Golodaeva, E. A. +3 more
core
Scalable Main Group Mechanocatalytic CO2 Valorisation to Cyclocarbonate Species
Angewandte Chemie International Edition, EarlyView.Herein, we present a scalable mechanocatalytic method for synthesizing cyclic carbonates from solid and liquid epoxides using CO₂ at 1 bar and room temperature. Employing a gallium aminotrisphenolate catalyst, this process achieves high yields, efficiently transforms multi‐terminal epoxides, and outperforms solution‐based methods in green metrics ...
Javier F. Reynes +6 more
wiley +1 more source
Angewandte Chemie International Edition, Accepted Article.This study presents a phosgene‐ and isocyanate‐free route for the synthesis of polyurethanes using (R)‐limonene as a bio‐based starting material. The synthesis of the cyclic limonene‐based carbamate monomer LU is achieved in high yields using dimethyl carbonate as a sustainable, less hazardous phosgene surrogate and is verified by NMR, SC‐XRD, ESI‐MS ...
Jonas Futter +4 more
wiley +1 more source
Angewandte Chemie International Edition, EarlyView.A biosynthesis route for the polymer precursor tulipalin A starting from isoprenyl acetate is proposed. The alkane monooxygenase AlkB catalyzes the chemoselective terminal hydroxylation of isoprenyl acetate. Rational enzyme engineering further increased the activity of the membrane enzyme.
Andrea Nigl +11 more
wiley +1 more source
Angewandte Chemie International Edition, EarlyView.The enantioselective epoxidation of naphthalenes into their corresponding arene oxides with aqueous hydrogen peroxide is described. The reaction combines dearomatization with installation of chemically versatile functionality in an enantioselective manner.
Najoua Choukairi Afailal +2 more
wiley +1 more source
5(S)-((3aR,4R,6aR)-2,2-Dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)-2-phenyl-4,5-dihydrooxazole
Molbank5(S)-((3aR,4R,6aR)-2,2-Dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)-2-phenyl-4,5-dihydrooxazole was synthesized from isosorbide in a three-step sequence, with an overall yield of 46%.
Liliana Boiaryna +2 more
doaj +1 more source