Results 131 to 140 of about 435,613 (313)

CO2‐to‐Cyclic Carbonate Transformation at Ambient Pressure Using a Mechanochemically Prepared Ti(III) Catalyst

Advanced Synthesis &Catalysis, EarlyView.
A Ti(III) complex synthesized mechanochemically catalyzes the cycloaddition of CO2 (1 bar) with terminal, internal, and trisubstituted epoxides. Mechanistic studies by density functional theory calculations reveal that the superior activity of Ti(III) compared to Ti(IV) arises from its lower oxophilicity, facilitating CO2 insertion into Ti–O bonds, as ...
Elena Álvarez‐Ruiz, Marta Navarro, Ignacio Sancho, Israel Fernández, Cristina Santamaría, Alberto Hernán‐Gómez   +5 more
wiley   +1 more source

Taxation and Pricing of Petroleum Products in Developing Countries: A Framework for Analysis with Application to Nigeria

, 2003
Shahabuddin Hossain
openalex   +2 more sources

Synthesis of Amidines Via P(III)/P(V)O Redox Catalyzed In Situ Formation of Imidoyl Chlorides From Amides

Advanced Synthesis &Catalysis, EarlyView.
A series of amidines are prepared via PIII/PVO redox catalyzed in situ formation of imidoyl chlorides from amides. The desired products are obtained in good to excellent yields. Moreover, the protocol is applied to the synthesis of Erlotinib. Amidines are a ubiquitous class of bioactive compounds found in a wide variety of natural products; thus ...
Viktorija Medvarić, Jan Paradies, Thomas Werner   +2 more
wiley   +1 more source

Solvent‐Free Mechanocatalytic Reduction of Nitro Compounds with Hydrogen Gas and its Application in the Synthesis of Drugs and their Intermediates

Advanced Synthesis &Catalysis, EarlyView.
A solvent‐free mechanochemical reduction of nitro compounds using hydrogen gas is presented. In addition to enabling the synthesis of a variety of functionalized aniline derivatives, the method has been scaled up to gram quantities, evaluated for trace metal impurities, and applied to the synthesis of pharmaceutical compounds and their precursors.
Samarth Bhatnagar, Michael Felderhoff, Jan‐Hendrik Schöbel   +2 more
wiley   +1 more source

EXPERIMENTAL INVESTIGATION OF A FILTER WITH NATURAL SORBENT CHARGE FOR RUNOFF CLEANING FROM HEAVY METALS AND PETROLEUM PRODUCTS

, 2006
Pranas Baltrėnas, Evelina Brännvall
openalex   +2 more sources

Analysis and Treatment of Water Contaminated by Petroleum Products [PDF]

, 2014
Nandini M. Naik, Girish S. Kulkarni, K.B. Prakash   +2 more
openalex   +1 more source

Redrawing the Mannich‐Type Reaction through Carbonyl Umpolung Reactivity

Advanced Synthesis &Catalysis, EarlyView.
GA: Herein, a conceptually novel one‐pot multicomponent strategy is reported for the streamlined construction of five‐membered imidazolidines from 1,2‐diaza‐1,3‐dienes (onefold), amines (twofold), and formaldehyde (twofold). This redesigned Mannich‐type reaction that exploits a carbene‐like activity of 1,2‐diaza‐1,3‐dienes (realized by “umpolung ...
Vittorio Ciccone, Sara Caselli, Giacomo Mari, Fabio Mantellini, Gianfranco Favi   +4 more
wiley   +1 more source

Tunable Preparation of α‐Aminoacyl Fluorides and α‐Fluoroamides via Base‐Induced Cascade Multiple‐Cleavage Processes from Bromodifluorohydrin Reagents and Amines

Advanced Synthesis &Catalysis, EarlyView.
A mild and versatile strategy enabling the divergent synthesis of α‐fluoroamides and α‐aminoacyl fluorides from 2‐bromo‐2,2‐difluoro alcohols and amines is developed. The reaction shows broad scope and operational simplicity. Mechanistic and density functional theory studies support the formation of a putative gem‐difluoroepoxide intermediate ...
Giulia De Santis, Andrea Maranzana, Federica Lauria, Mauro Spennacchio, Michael Andresini, Rosa Purgatorio, Marco Colella, Renzo Luisi, Leonardo Degennaro   +8 more
wiley   +1 more source

Biochemical and haematological assessment of workers exposed to some petroleum products in Enugu Urban, Enugu State, Nigeria

, 2007
EO Ukaejiofo, Thomas Nubila, SO Ike
openalex   +2 more sources

Visible‐Light‐Promoted Dearomatization for The Construction of Imidazole Scaffolds

Advanced Synthesis &Catalysis, EarlyView.
Lighting up flat aromatics: a visible‐light photocatalytic dearomative acylation of imidazo[1,2‐a]pyridines using α‐keto acids as sustainable acyl radical precursors is reported, leading to dual fluorescent imidazoles. Dearomatization is a powerful strategy for constructing complex carbocycles and heterocycles, though it typically relies on harsh ...
Silvia Roscales, Aurelio G. Csáky
wiley   +1 more source