Regeneration of carbonyl compounds from oximes by chromium trioxide supported onto HZSM-5 zeolite under microwave irradiation in solvent-free conditions

2004 ◽  
Vol 2004 (2) ◽  
pp. 137-138 ◽  
Author(s):  
Majid M. Heravi ◽  
Fereshteh Hydarzadeh ◽  
Yahya Farhangi ◽  
Mitra Ghassemzadeh
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Chromium Trioxide ◽  
Solvent Free ◽  
Solvent Free Conditions

Remarkable Fast Microwave-assisted Zeolite HZSM-5 Catalyzed Oxidation of Alcohols with Chromium Trioxide under Solvent-free Conditions

1999 ◽  
Vol 23 (5) ◽  
pp. 334-335 ◽  
Author(s):  
Majid M. Heravi ◽  
Dariush Ajami ◽  
Kourosh Tabar-Hydar ◽  
Mitra Ghassemzadeh
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Chromium Trioxide ◽  
Solvent Free ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
Oxidation Of Alcohols ◽  
Catalyzed Oxidation

A variety of alcohols are oxidized to the corresponding carbonyl compounds in excellent yields by chromium trioxide-HZSM-5 zeolite under microwave irradiation in a solventless system.

Silica Gel Supported Sodium Hydrogen Sulfate as an Efficient and Reusable Heterogeneous Catalyst for the Synthesis of Imines in Solvent-free Conditions under Microwave Irradiation

2005 ◽  
Vol 2005 (5) ◽  
pp. 299-303 ◽  
Author(s):  
Mannathusamy Gopalakrishnan ◽  
Purushothaman Sureshkumar ◽  
Vijayakumar Kanagarajan ◽  
Jeyaraman Thanusu ◽  
Ramalingam Govindaraju
Keyword(s):  
Microwave Irradiation ◽  
Heterogeneous Catalyst ◽  
Silica Gel ◽  
Diethyl Ether ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Hydrogen Sulfate ◽  
Sodium Hydrogen ◽  
Solvent Free Conditions

This synthesis of imines has been carried out efficiently by the condensation of carbonyl compounds with amines in the presence of silica gel supported sodium hydrogen sulfate (NaHSO4.SiO2) as a heterogeneous catalyst under microwave irradiation in solvent-free conditions. NaHSO4.SiO2 can be recovered and re-used up to ten times by simple washing with diethyl ether after each use and activated in an oven at 120 °C for 1 h, thus rendering the process more economical.

Uncatalysed Preparation of α-Amino Phosphonates under Solvent Free Conditions

2005 ◽  
Vol 2005 (5) ◽  
pp. 324-327 ◽  
Author(s):  
Mohamed Zahouily ◽  
Abdelhakim Elmakssoudi ◽  
Abdessamad Mezdar ◽  
Ahmed Rayadh ◽  
Saïd Sebti
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Environmentally Friendly ◽  
Solvent Free ◽  
Aliphatic Amines ◽  
Solvent Free Conditions ◽  
Dialkyl Phosphites ◽  
High Yields ◽  
Amino Phosphonates ◽  
Aromatic And Aliphatic Amines

A simple, efficient and environmentally friendly procedure has been developed for the three component coupling of carbonyl compounds, aromatic and aliphatic amines and dialkyl phosphites to produce α-amino phosphonates. The α-amino phosphonates are synthesised in high yields (74–97%) in a few minutes (1–3 min) by microwave irradiation under solvent-free conditions, avoiding the use of any catalyst.

Efficient and Practical Solvent-Free Oxidation of Alcohols using Microwave Irradiation

2002 ◽  
Vol 2002 (6) ◽  
pp. 286-287 ◽  
Author(s):  
Mohammad M. Mojtahedi ◽  
Ali Sharifi ◽  
Sharif Kaamyabi ◽  
Mohammad R. Saidi
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Oxidation Of Alcohols ◽  
Free Oxidation

Alcohols are oxidised rapidly to the corresponding carbonyl compounds by montmorillonite KSF or silica supported barium manganate, under solvent-free conditions and microwave irradiation.

scholarly journals Two New 1,1,3,3-Tetramethylguanidinium Halochromates (C5H14N3CrO3X) (X: Cl, F): Efficient Reagents for Oxidation of Organic Substrates under Solvent-Free Conditions and Microwave Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Kıvılcım Şendıl ◽  
H. Beytiye Özgün ◽  
Ebru Üstün
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Secondary Alcohols ◽  
Organic Substrates ◽  
Oxidizing Agents ◽  
Solvent Free Conditions ◽  
High Yields

Two new mild oxidizing agents 1,1,3,3-tetramethylguanidinium fluorochromate (TMGFC) and 1,1,3,3-tetramethylguanidinium chlorochromate (TMGCC) were prepared in high yields by reacting tetramethylguanidine with CrO3and related acid. These reagents are suitable to oxidize various primary and secondary alcohols and oximes to the corresponding carbonyl compounds under solvent-free conditions and microwave irradiation.

One-Pot, Regioselective Synthesis of Homopropargyl Alcohols using Propargyl Bromide and Carbonyl Compound by the Mg-mediated Reaction under Solvent-free Conditions

2020 ◽  
Vol 17 (6) ◽  
pp. 438-442
Author(s):  
Xiaofang Ma ◽  
Shunxi Li ◽  
Samrat Devaramani ◽  
Guohu Zhao ◽  
Daqian Xu
Keyword(s):  
Reaction Time ◽  
Organic Synthesis ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Propargyl Bromide ◽  
Important Goal ◽  
One Pot ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
Volatile Organic

The elimination of volatile organic solvents in organic synthesis is the most important goal in “Green” chemistry. We report a simple, efficient and facile method for the addition of progargyl bromide to carbonyl compounds using Mg metal as a mediator under solvent-free conditions which could regioselectively generate homopropargyl alcohols efficiently in good to excellent yields. The procedure has advantages such as short reaction time, operationally simple, excellent product yields, high regioselectivity and organic solvent-free.

scholarly journals Tandem Fries Reaction–Conjugate Addition under Microwave Irradiation in Dry Media; One-pot Synthesis of Flavanones

1999 ◽  
Vol 23 (9) ◽  
pp. 574-575
Author(s):  
Firouz Matloubi Moghaddam ◽  
Mohammad Ghaffarzadeh ◽  
Seyed Hossein Abdi-Oskoui
Keyword(s):  
Microwave Irradiation ◽  
Silica Gel ◽  
Conjugate Addition ◽  
Solvent Free ◽  
Naphthalene Derivatives ◽  
One Pot ◽  
Fries Rearrangement ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Fries Reaction

An AICl3–ZnCl2 mixture supported on silica gel is found to be an efficient medium for the Fries rearrangement of acyloxybenzene or naphthalene derivatives in solvent-free conditions under microwave irradiation.

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