scholarly journals Mild and Efficient Oxidation of Aromatic Alcohols and Other Substrates Using NiO2/CH3COOH System

2008 ◽  
Vol 5 (2) ◽  
pp. 365-369
Author(s):  
Mohammad Kooti ◽  
Mehdi Jorfi
Keyword(s):  
Acetic Acid ◽  
Mild Conditions ◽  
Aromatic Alcohols ◽  
Aldehydes And Ketones

A variety of aromatic alcohols were efficiently oxidized to their corresponding aldehydes and ketones in good to excellent yields using nickel peroxide activated by acetic acid. Some thiols and amines were also readily oxidized by this oxidant under mild conditions.

scholarly journals Fe(II)-phthalocyanine supported on chitosan aerogel as a catalyst for oxidation of alcohols and alkyl arenes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fatemeh Azimi ◽  
Ahmad Poursattar Marjani ◽  
Sajjad Keshipour
Keyword(s):  
Aspect Ratio ◽  
Heterogeneous Catalyst ◽  
High Aspect Ratio ◽  
Room Temperature ◽  
Oxidation Reactions ◽  
Mild Conditions ◽  
Oxidation Of Alcohols ◽  
Aromatic Alcohols ◽  
Aldehydes And Ketones ◽  
Low Toxicity

AbstractManipulation of materials is considered as one of the eminent strategies to create desirable catalysts. In this regard, increasing surface area and decreasing dimensions of catalysts have been widely employed on account of effectiveness of these methods. Herein, aerogel form of chitosan as a sustainable, and high aspect ratio compound is employed as a green support for the catalytic purposes. Chitosan aerogel was modified with Fe(II)-phthalocyanine to produce a heterogeneous catalyst for oxidation reactions. The synthesized catalyst promoted the oxidation reactions of alcohols and alkyl arenes to the corresponding aldehydes and ketones using H2O2 as an oxidant in 24 h. The reactions for aliphatic and aromatic alcohols gave turnover numbers of 106–109 at 80 °C and 106–117 at room temperature, respectively. The oxidations of alkyl arenes were carried out with turnover numbers laying in the range of 106–117 at 100 °C. The low toxicity, inexpensive nature, and recycling possibility of the catalyst accompanied by the reaction mild conditions, clean oxidant, and excellent yields offer chitosan aerogel modified with Fe(II)-phthalocyanine as a promising catalyst for oxidation reactions.

An unusual reaction of a bridged triterpenoid α-diketone with acetic anhydride

1991 ◽  
Vol 56 (12) ◽  
pp. 2917-2935 ◽  
Author(s):  
Eva Klinotová ◽  
Václav Křeček ◽  
Jiří Klinot ◽  
Miloš Buděšínský ◽  
Jaroslav Podlaha ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Acetic Anhydride ◽  
Spectral Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mild Conditions ◽  
Condensation Products ◽  
Unsaturated Lactones ◽  
C Nmr

3β-Acetoxy-21,22-dioxo-18α,19βH-ursan-28,20β-olide (IIIa) reacts with acetic anhydride in pyridine under very mild conditions affording β-lactone IVa and γ-lactones Va and VIIa as condensation products. On reaction with pyridine, lactones Va and VIIa undergo elimination of acetic acid to give unsaturated lactones VIIIa and IXa, respectively. Similarly, the condensation of 20β,28-epoxy-21,22-dioxo-18α,19βH-ursan-3β-yl acetate (IIIb) with acetic anhydride leads to β-lactone IVb and γ-lactone Vb; the latter on heating with pyridine affords unsaturated lactone VIIIb and 21-methylene-22-ketone Xb. The structure of the obtained compounds was derived using spectral methods, particularly 1H and 13C NMR spectroscopy; structure of lactone IVa was confirmed by X-ray diffraction.

scholarly journals Highly efficient epoxidation of vegetable oils catalyzed by a manganese complex with hydrogen peroxide and acetic acid

2019 ◽  
Vol 21 (9) ◽  
pp. 2436-2447 ◽  
Author(s):  
Jianming Chen ◽  
Marc de Liedekerke Beaufort ◽  
Lucas Gyurik ◽  
Joren Dorresteijn ◽  
Matthias Otte ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Vegetable Oils ◽  
Manganese Complex ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Catalytic Epoxidation

A highly efficient catalytic epoxidation of vegetable oils under mild conditions was developed, using a homogeneous Mn catalyst and H2O2 as oxidant.

α-Chymotrypsin-Induced Acetalization of Aldehydes and Ketones with Alcohols

Synthesis ◽  
2020 ◽  
Vol 52 (14) ◽  
pp. 2121-2126
Author(s):  
Zhanggao Le ◽  
Zongbo Xie ◽  
Jin Lan ◽  
Guofang Jiang ◽  
Jiangnan Yang ◽  
...  
Keyword(s):  
Catalytic Amount ◽  
First Report ◽  
Mild Conditions ◽  
Aldehydes And Ketones ◽  
Neutral Conditions ◽  
Induced Reaction ◽  
General Method

This is the first report of a simple and general method for acetalization­ of aldehydes via an α-chymotrypsin-induced reaction under mild conditions. A broad range of aromatic and heteroaromatic aldehydes have been acetalized under neutral conditions in good yields using a catalytic amount of chymotrypsin.

Peptide syntheses with the 2,4,6-trimethylbenzyl esters of L-asparagine and L-glutamine

1967 ◽  
Vol 20 (2) ◽  
pp. 365 ◽  
Author(s):  
FHC Stewart
Keyword(s):  
Acetic Acid ◽  
Amino Acid ◽  
Hydrogen Chloride ◽  
Hydrogen Bromide ◽  
Amino Acid Esters ◽  
Mild Conditions ◽  
Acid Esters

The 2,4,6-trimethylbenzyl esters of L-asparagine and L-glutamine have been obtained as the crystalline hydrochlorides by treatment of the o- nitrophenylsulphenyl amino acid esters with methanolic hydrogen chloride. These hydrochlorides were used in the synthesis of several benzyloxycarbonyl peptide 2,4,6-trimethylbenzyl esters, which were converted into the corresponding free peptides by the action of hydrogen bromide in acetic acid under mild conditions.

ChemInform Abstract: Synthesis of Bimagnetic Ionic Liquid and Application for Selective Aerobic Oxidation of Aromatic Alcohols under Mild Conditions.

ChemInform ◽  
2011 ◽  
Vol 42 (21) ◽  
pp. no-no
Author(s):  
Cheng-Xia Miao ◽  
Jin-Quan Wang ◽  
Bing Yu ◽  
Wei-Guo Cheng ◽  
Jian Sun ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Aerobic Oxidation ◽  
Mild Conditions ◽  
Aromatic Alcohols ◽  
Selective Aerobic Oxidation

Partial Oxidation of Alcohols to Aldehydes and Ketones Under Mild Conditions

2004 ◽  
Vol 34 (10) ◽  
pp. 1753-1758 ◽  
Author(s):  
Guang Qian ◽  
Rui Zhao ◽  
Gaomeng Lu ◽  
Yanxing Qi ◽  
Jishuan Suo
Keyword(s):  
Partial Oxidation ◽  
Mild Conditions ◽  
Oxidation Of Alcohols ◽  
Aldehydes And Ketones

AN ULTRASOUND MEDIATED GREEN SYNTHESIS OF 2-PYRAZOLINE DERIVATIVES

2021 ◽  
pp. 36-39
Author(s):  
Shrivastava Birendra ◽  
Upasna Upasna ◽  
Arora Satish Chander
Keyword(s):  
Acetic Acid ◽  
Green Synthesis ◽  
19Th Century ◽  
Heterocyclic Compounds ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones ◽  
The 19Th Century

Pyrazolines are prominent nitrogen-containing heterocyclic compounds and therefore, various procedures have been worked out for their synthesis. After the pioneering work of Fischer and Knoevenagel in the 19th century, the reaction of α, β-unsaturated aldehydes and ketones with phenylhydrazine in acetic acid by reuxing became one of the most popular methods for the preparation of 2-pyrazolines. Aseries of substituted 2- pyrazolines was synthesized by ultrasound irradiated method to nd out cleaner/ greener approaches.

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