Treatment Of Carbonyl Compounds Research Articles

One-Pot Synthesis of Tetracyanocyclopropane Derivatives Using Hexamethylenetetramine-Bromine (HMTAB)

Herein a direct method for synthesis of tetracyanocyclopropanes by the treatment of carbonyl compounds, malononitrile and hexamethylenetetramine-bromine (HMTAB) is described in the presence of catalytic amount of DABCO in ethanol media at room temperature.

Evaluation and Treatment of Carbonyl Compounds and Fine Particles Emitted by Combustion of Biodiesels in a Generator

The main objectives of this study are the assessment of fine particles (PM2.5) and carbonyl compound emissions from an electrical generator fueled with biodiesels and the evaluation of the efficiency of a commercial 4-way catalytic converter toward these pollutants. Two different biodiesels were used: Soybean Oil fatty acid Methyl Esters (SOME) and Waste Cooking Oil fatty acid Ethyl Esters (WCOEE). Several biodiesel blends with petroleum diesel were tested (0%vol, 7%vol, 20%vol, and 50%vol). For all blends it was shown that particles are mainly composed of ultrafine particles with a diameter below 0.4 μm. The presence of a 4-way catalyst allows the reduction of the total number of particles emitted by at least 97%. However, the fraction of the smaller particles (PM0.1), which are particularly harmful to health, becomes predominant. The origin and concentration of biodiesel introduced in the fuel influence both the total number of emitted particles and their size distribution. The different behavior of the...

Rhenium-catalyzed reaction of carbonyl compounds with ketene silyl acetals

It was found that rhenium complex is an effective catalyst for the reaction of carbonyl compounds with ketene silyl acetals. A wide range of β-silyloxy esters is obtained by the treatment of carbonyl compounds with ketene silyl acetals in the presence of a catalytic amount of ReBr(CO)5 in moderate to good yields.

New methods for the preparation of 1-alkenyl ethers and sulfides using di- and tri-thioorthoformates

Abstract The treatment of carbonyl compounds with the organotitanium species formed from methoxybis(phenylthio)methane and low valent titanium species Cp 2 Ti[P(OEt) 3 ] 2 gave 1-alkenyl ethers in good yields. 1-Alkenyl sulfides were also obtained by the similar reaction using triphenyl trithioorthoformate. These reactions were successfully applied to carboxylic esters and thiolesters to produce 1,2-diheteroatom substituted 1-olefins.

Facile preparation of N-methyl secondary amines by titanium(IV) isopropoxide-mediated reductive amination of carbonyl compounds

A simple, mild and efficient procedure for obtaining N-methyl secondary amines from aldehydes and ketones is reported. Treatment of carbonyl compounds with methylamine hydrochloride, triethylamine and titanium(IV) isopropoxide, followed by in situ sodium borohydride reduction and straightforward aqueous work-up, affords clean products in good to excellent yields.

ChemInform Abstract: An Efficient Synthesis of Selenocarbonyl Compounds by the Treatment of Carbonyl Compounds with Bis(1,5‐cyclooctanediylboryl) Selenide.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

An Efficient Synthesis of Selenocarbonyl Compounds by the Treatment of Carbonyl Compounds with Bis[1,5-cyclooctanediylboryl] Selenide

Abstract An efficient synthesis of selenoaldehydes, selenoketones, and selenoamides was achieved by the treatment of carbonyl compounds with bis[1,5-cyclooctanediylboryl] selenide.

Synthesis of mono and gem-dihalogeno-olefins from carbonyl compounds and in situ generated lithium carbenoids

The treatment of carbonyl compounds (5) with dihalogenomethane and lithium dicyclohexylamide at –78 °C leads after acid hydrolysis to the crude alcohols (6), which by silylation with trimethylchlorosilane–hexamethyldisilazane–pyridine affords the crude silylated alcohols (7); final treatment of compound (7) with lithium di-isopropylamide or butyl-lithium (when one of the halogens is bromine) at low temperature gives the corresponding di- or mono-halogenated olefins (8) or (9), respectively, through a sole β-elimination process.

Polymer-supported phosphonates. Olefins from aldehydes, ketones, and dioxolans by means of polymer-supported phosphonates

Phosphonates substituted with electron-withdrawing groups (CN and CO2Me) have been supported, by means of a neutralization reaction, on the macroreticular anion-exchange resin Amberlyst A-26. Treatment of carbonyl compounds with the polymer-bound phosphonate in various solvents gave olefins in high yields, at room temperature. Either batch or column techniques are employed, the latter offering the opportunity of a continuous procedure. The simultaneous use of the phosphonate resin and of an acidic one (Amberlyst 15 H) allowed the direct sequential hydrolysis and olefination of dioxolans.