Catalyst For Acetylation Of Alcohols Research Articles

Fe3O4@SiO2/Schiff Base Complex of Co(II) as an Efficient Lewis Acid Nanocatalyst for Acetylation of Alcohols and Phenols Under Solvent-Free Conditions

Fe3O4@SiO2/Schiff base complex of Co(II) nanocatalyst was used as a novel, efficient catalyst for acetylation of alcohols and phenols with acetic anhydride in high yields under solvent-free conditions. Various primary, secondary and tertiary alcohols were acetylated under solvent-free conditions in the presence of catalytic amount of the nanocatalyst at room temperature. Also, Fe3O4@SiO2/Schiff base/Co(II) can catalyze the acetylation of various alcohols by the reaction of alcohols with ethyl acetate under reflux conditions. The nanocatalyst can be simply recovered by a magnetic field and reused over five times without any significant loss of its catalytic activity.

Preparation and characterization of multi-walled carbon nanotubes (MWCNTs), functionalized with phosphonic acid (MWCNTs–C–PO3H2) and its application as a novel, efficient, heterogeneous, highly selective and reusable catalyst for acetylation of alcohols, phenols, aromatic amines, and thiols

A novel, efficient, heterogeneous, and reusable multi-walled carbon nanotubes (MWCNTs), functionalized with phosphonic acid (MWCNTs–C–PO3H2) has been synthesized. The synthesized CNTs were characterized using some electron microscopic techniques such as scanning electron microscopy (SEM), atomic force microscopy (AFM), Energy dispersive X-ray spectroscopy (EDAX), and also some thermal and spectroscopic methods such as thermogravimetry (TG). The nitrogen adsorption behavior of the MWCNTs–C–PO3H2 catalyst was evaluated using the TG instrumentation system at 25 °C. The catalyst was applied successfully for highly efficient and selective acetylation of alcohols, phenols, thiols and aromatic amines with acetic anhydride at room temperature under solvent-free conditions. The reusability of the catalyst was checked and the recovered catalyst was reused for five runs without significant loss in activity.

ChemInform Abstract: Lewis Basic Ionic Liquid as an Efficient and Facile Catalyst for Acetylation of Alcohols, Phenols, and Amines under Solvent‐Free Conditions.

AbstractThe ionic liquid can easily be recovered and used to catalyze further acetylation reactions with excellent yields.

ChemInform Abstract: Poly(N‐vinylimidazole) as an Efficient Catalyst for Acetylation of Alcohols, Phenols, Thiols and Amines under Solvent‐Free Conditions.

AbstractThe catalyst can be recovered and reused several times.

Poly(N-vinylimidazole) as an efficient catalyst for acetylation of alcohols, phenols, thiols and amines under solvent-free conditions

Poly(N-vinylimidazole) is able to promote instantaneous quantitative acetylation of a variety of functionalized alcohols, phenols, thiols and amines with acetic anhydride at room temperature under solvent-free conditions. This new method consistently has excellent yields and the catalyst can be reused and recovered several times. Furthermore, the reaction can even be carried out on a larger scale.

Iron(III) tosylate catalyzed acylation of alcohols, phenols, and aldehydes

Iron(III) p-toluenesulfonate (tosylate) is an efficient catalyst for acetylation of alcohols, phenols, and aldehydes. The acetylation of 1° and 2° alcohols, diols, and phenols proceeded smoothly with 2.0mol% of catalyst. However, the reaction worked well with only a few 3° alcohols. The methodology was also applicable to the synthesis of a few benzoate esters but required the use of 5.0mol% catalyst. Aldehydes could also be converted into the corresponding 1,1-diesters (acylals) under the reaction conditions. Iron(III) tosylate is an inexpensive, and easy to handle, commercially available catalyst.

Lewis basic ionic liquid as an efficient and facile catalyst for acetylation of alcohols, phenols, and amines under solvent-free conditions

The Lewis basic ionic liquid 1,8-diazabicyclo[5.4.0]undec-7-en-8-ium acetate was employed for the acetylation of various phenols, alcohols, and amines in good-to-excellent yields at 50 °C under solvent-free conditions in a short time. Compared with existing methods based on conventional catalysts and toxic solvents, the reported method is simple, mild and environmentally viable. Furthermore, the ionic liquid was conveniently separated from the products and easily recycled to catalyze other acetylation reactions with excellent yields. .

Preparation, characterization and use of poly(4-vinylpyridinium) perchlorate as a new, efficient, and versatile solid phase catalyst for acetylation of alcohols, phenols and amines

Poly(4-vinylpyridine) perchlorate, is a supported, recyclable, eco-benign catalyst for the reaction acetylation of structurally diverse alcohols, phenols and amines at room temperature under solvent-free conditions. The catalyst was studied by FT-IR, X-ray diffraction, Scanning Electron Microscope and Thermo-gravimetric Analyses. All the products were extensively characterized by 1H NMR, FT-IR, GC–MS and melting point analyses. The catalyst can be recovered and reused without loss of activity. The work-up of the reaction consists of a simple filtration, followed by concentration of the crude product and purification. It is important to point out that a large-scale reaction is possible using a same amount of catalyst.

Investigation of catalytic activity of high-valent vanadium(IV) tetraphenylporphyrin: A new, highly efficient and reusable catalyst for acetylation of alcohols and phenols with acetic anhydride

In the present work, the catalytic activity of high-valent tetraphenylporphyrinatovanadium(IV) trifluoromethanesulfonate, [V IV(TPP)(OTf) 2], in the acetylation of alcohols and phenols with Ac 2O is reported. This new V(IV) catalyst was used as an efficient catalyst for not only primary alcohols (benzylic and aliphatic) but also sterically-hindered secondary and tertiary alcohols with acetic anhydride and the corresponding acetates were obtained in 85–99% yield and 0.5–15 min. Acetylation of phenols with acetic anhydride was also performed to afford the desired acetates in 88–99% and 1.5–20 min. This catalyst can be reused several times without loss of its catalytic activity.

Polystyrene-bound electron-deficient tin(IV) porphyrin: A new, highly efficient, robust and reusable catalyst for acetylation of alcohols and phenols with acetic anhydride

Abstract In the present work, tetrakis(p-aminophenyl)porphyrinatotin(IV) trifluoromethanesulfonate, [SnIV(TNH2PP)(OTf)2], supported on chloromethylated polystyrene was prepared and characterized by elemental analysis, FT IR and diffuse reflectance UV-Vis spectroscopic methods. This new heterogenized catalyst was used for acetylation of alcohols and phenols with acetic anhydride in short reaction times and high yields. The catalyst is of high reusability and stability in the acetylation reactions and was recovered several times without loss of its initial activity and catalyst leaching.

Modified attapulgite: An efficient solid acid catalyst for acetylation of alcohols using acetic acid

Acid treated attapulgites catalyze acetylation of alcohols using acetic acid in excellent yield. Natural attapulgites from different states of India: Gujarat, Andra Pradesh and Karnataka were modified by acid activation to prepare solid acid catalysts. Detailed catalyst characterization was carried out by XRD, chemical analysis, SEM, surface area, cation exchange capacity and acidity measurements. Acetylation of cyclohexanol using acetic acid was selected as the test reaction. Efficiency of these catalysts was compared with the catalyst prepared from the authentic sample (Source Clay Minerals Repository, U.S.A) and also the commercial ones, K-10 and KSF/0. Performance of the indigenous catalysts was found comparable in selectivity and percentage conversion. Acetylation of different primary and secondary alcohols also gave excellent yield. Acetylation over attapulgite using acetic acid is being reported for the first time.

N,N ′-Diiodo-N,N′-1,2-ethanediylbis(p-toluenesulfonamide) as an Efficient Catalyst for Acetylation of Alcohols, Phenols, Amines, and Thiols Under Solvent-Free Conditions

N,N′-Diiodo-N,N′-1,2-ethanediylbis(p-toluenesulfonamide) (NIBTS) is a highly efficient catalyst for the acetylation of alcohols, phenols, amines, and thiols under solvent-free conditions. Primary, secondary, tertiary alcohols; phenols; amines; and thiols can be easily acetylated in good to excellent yields at 80 °C.

ChemInform Abstract: HZSM-5-Zeolite as Remarkable and Reusable Catalyst for the Direct Acetylation of Alcohols and Phenols under Solvent-Free Conditions.

Zeolites as catalysts for selective organic reactions have received considerable attention in recent decades due to their unique physical and chemical properties such as shape, se lectivity , acidic and basic nature and their thermal stability) . Besides the general advantages associated with heterogeneous catalysts like convenient use, easy separation, and being inexpensive zeolite can also be prepared with different porosity, hydrophilicity, varying acid and basic strength and site distribution . This makes zeolites versatile catalysts for a variety of reactions. We have recently used zeolites in different organic methodologies. Armed with these experiences, in this note we present the acetylation of alcohols and phenols using HZSM-5 zeolite as reusable catalyst under solvent-free condition. HZSM-5 zeolite (Si02/AI 20 J, 40) was prepared following the previously described procedure.J. Prior to the experiments, the zeo lite was activated by heating at 400°C for 8 hr. The react ion was performed by heating the mixture of hydroxy compound, acet ic anhydride and HZSM-5 zeolite at 50°C for the selected time. Good to hi gh yie lds (75-95 9'0) were observed in all the cases. This reac ti on to lerates other functionaliti es such as carbon-carbon double and triple bonds (Table I). It is noteworthy to mention that in the absence of zeolite the reaction was slow and considerable amount of starting material was recovered uncharged after indicated time of reaction (Table I ). The reaction was also sluggish when it was

Saccharinsulfonic acid: an efficient and recyclable catalyst for acetylation of alcohols, phenols, and amines

Saccharinsulfonic acid is an efficient catalyst of the protection of alcohols, phenols, and amines with acetic anhydride. All reactions were performed under mild and completely heterogeneous reaction conditions. with excellent yields.

ChemInform Abstract: Iodine Supported on 3‐Aminopropyl Silica Gel as Efficient Catalyst for Acetylation of Alcohols under Solvent‐Free Conditions.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 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.

Brönsted Acidic Ionic Liquid as an Efficient Catalyst for Acetylation of Alcohols and Phenols

AbstractA novel Brönsted acidic room temperature ionic liquid (1‐H‐3‐methyl‐imidazolium bisulfate) is found to catalyze efficiently the acetylation of a wide rang of alcohols as well as phenols with acetic anhydride in good to excellent yields at 50°C under solvent‐free conditions. Products are easily isolated by extraction with ether and the protocol is mild and green, compared to the existing method based on toxic solvents.

ChemInform Abstract: A Heterogeneous Cobalt(II) Salen Complex as an Efficient and Reusable Catalyst for Acetylation of Alcohols and Phenols.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 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.

Iodine Supported on 3‐Aminopropyl Silica Gel as Efficient Catalyst for Acetylation of Alcohols under Solvent‐free Conditions

Abstract3‐Aminopropyl silica gel (I2/APSG) was found to catalyze the acetylation of alcohols and phenols efficiently with acetic anhydride. The reaction is mild and selective with high yields. A wide variety of alcohols and phenols are selectively converted into the corresponding acetates using I2/APSG under solvent‐free conditions at room temperature.

A heterogeneous cobalt(II) Salen complex as an efficient and reusable catalyst for acetylation of alcohols and phenols

Acetylation of various alcohols and phenols was performed successfully using an immobilized cobalt(II) catalyst in high yield. The catalyst shows high thermal stability and was also recovered and reused at least 10 times without any considerable loss of activity.

ChemInform Abstract: Polymer‐Supported Gadolinium Triflate as a Convenient and Efficient Lewis Acid Catalyst for Acetylation of Alcohols and Phenols.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 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.