نتایج جستجو برای: dehydration of alcohols

تعداد نتایج: 21165385  

Journal: :Chemical communications 2011
Jihoon Choi Bobin Lee Chan-Mo Yu

An enantioselective synthesis of the homoallenyl alcohols was achieved from the reaction of chiral 2-borylbutadiene with aldehydes through an allylic transfer reaction in good yields and enantioselectivities.

Parvaneh Pakravan Shahla Masoudian

Iron (III) meso-tetrakis(p-sulfonatophenyl)-β-octabromoporphyrin supported on Amberlite IRA- 400 [Fe(Br8 TPPS)-Ad-400] is a robust and efficient catalyst for oxidation of alkenes and alcohols at room temperature. The catalyst exhibits a high activity and stability in hydrocarbon oxidation by H2 O2 . The method was useful in the oxidation of various primary, secondary-aliphatic, alicyclic and ar...

Journal: :Chemical communications 2014
Xuesong Wang Guolin Cheng Xiuling Cui

A novel and efficient approach to 3-allyl-chromones from alkynones and allylic alcohols via a tandem Michael addition-Claisen rearrangement-O-arylation reaction has been developed. Diversely structural 3-allyl-chromones were afforded in up to 93% yield for 24 examples. This synthetic strategy is regiospecific, highly efficient, environment friendly and metal-free.

محلوجی, خدیجه,

The approach to patients with gmrointestinal tract infections begins with a thorough mediCdI history, induding information about epidemiologic factors, a physiCdI examination, and knowledge of the pathophysiology of various enteropathogens. Gastrointestinal tract infections conduded with a wide range of symptom complexes and csn be produced by a variety of Mferopathogens. Most infectious diarrh...

A. Javadi F. Shekar

Drying is one of the widely used methods of food preservation and it is a sensitive food processing operation due to undesirable changes in the quality of dried product. In this study the effect of osmotic dyhedration and ultrasound pretreatment prior to convective drying on quality properties of apple slices was investigated. Apple slices were pretreated by osmotic dehydration in two concentra...

Journal: :بوم شناسی کشاورزی 0
حامد هادی نانسی بابائی جهانفر دانشیان محمد حسین ارزانش آیدین حمیدی

seedling characteristics of different sunflower (helianthus annus l.) cultivars under drought stress and inoculation with the azospirillum lipoferum in a spilt-factorial layout based on randomized complete block design with three replications were evaluated. treatments included dehydration stress (seed produced on maternal plants which irrigated after 60 (desirable irrigation), 120 (medium stre...

Journal: :Food and Bioprocess Technology 2022

This study investigates the effects of different process parameters (sugar dose, sugar size, and ultrasonic treatment time) on solid osmotic dehydration (SOD) jasmine flowers physiochemical characteristics syrup. The kinetics moisture loss, solute gain, effective diffusivity during SOD were predicted by fitting experimental data with Azuara model, Weibull Fick second law model. results showed t...

Journal: :Reactions 2021

Fischer–Tropsch synthesis (FTS) produces hundreds of hydrocarbons and oxygenates by simple reactants (CO + H2) the detailed chain propagation mechanism is still in dispute. An industrial iron-based catalyst was used to further clarify adding aldehyde, alcohol alkene species into a fixed-bed tubular reactor. The added were investigated H2 syngas atmospheres, respectively. 1-alkene atmosphere pre...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2013
ahmad tavasoli saba karimi hamideh nikookar hamzeh fadakar

an extensive study of higher alcohols synthesis (has) from syngas using alkalized mos2 catalysts supported on carbon nanotubes (cnts) is reported. up to 30wt.% of mo and 8wt.% k are added to the cnts by impregnation method. the catalysts were characterized by different methods and the performance of the catalysts was assessed in a micro-reactor. tem images showed that most of the metal particle...

Journal: :journal of ultrafine grained and nanostructured materials 2012
m. g. hosseini m. m. momeni

we explore electro-catalytic properties of a system consisting of platinum and palladium nanoparticles dispersed over a nanotubular self-organized tio2 matrix. these electrodes prepared by electroess and microemulsion of palladium and palladium nanoparticles on to tio2 nanotubes, respectively. titanium oxide nanotubes were fabricated by anodizing titanium foil in ethylene glycol (eg) fluoride-c...

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