- A succinimide-N-sulfonic acid catalyst for acetylation reactions in absence of a solvent
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A small amount of succinimide-N-sulfonic acid efficiently catalyzed the acetylation of a variety alcohols, phenols, thiols, amines and aldehydes with acetic anhydride at room temperature under solvent free conditions. This catalyst has the advantages of excellent yields and short reaction times and the reaction can be carried out on a large scale, which makes it potentially useful for industrial applications.
- Shirini, Farhad,Khaligh, Nader Ghaffari
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- Synthesis of 1,1-diacetates catalysed by silica-supported boron sulfonic acid under solvent-free conditions and ambient temperature
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1,1-Diacetates derivatives were prepared using the direct condensation of aldehydes with acetic anhydride in the presence of silica-supported boron sulfonic acid (SiO2/B(SO4H)3) as a tri-functional inorganic Bronsted acid catalyst under solvent-free conditions at ambient temperature. The salient features of this methodology are: (i) cheaper process ready availability of the catalyst; (ii) versatility; (iii) high regio-selectivity of the procedure and recyclable property of the catalyst.
- Sajjadifar, Sami,Rezayati, Sobhan
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p. 531 - 539
(2014/01/17)
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- A convenient and efficient protocol for the synthesis of acylals catalyzed by Br?nsted acidic ionic liquids under ultrasonic irradiation
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The synthesis of acylals (1,1-diacetates) via the reactions of aldehydes with acetic anhydride was carried out in 85-97% yields at room temperature under ultrasound irradiation catalyzed by the Br?nsted acidic ionic liquid [bmpy]HSO4. This method provides several advantages, such as solvent-free conditions, operational simplicity, higher yields, and reduced environmental consequences. The ionic liquid was recovered and reused.
- Borikar, Sanjay P.,Daniel, Thomas
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experimental part
p. 928 - 931
(2012/03/08)
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- Solvent free diacetylation of aldehydes using a solid acid under microwave irradiation and a simple route to their regeneration
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A simple solvent-free microwave mediated procedure for the selective protection of aldehydes by conversion to their 1,1-diacetates is reported. The resultant diacetates were deprotected to generate the aldehyde using aqueous formic acid in the presence of a surfactant in high yield.
- Barua, Akashi,Das, Pranab J.
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p. 938 - 941
(2008/12/23)
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- A mild and efficient method for the chemoselective synthesis of acylals from aldehydes and their deprotections catalysed by ceric ammonium nitrate
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A mild and efficient method has been developed for the chemoselective synthesis of geminal diacetates (acylals) from aldehydes using acetic anhydride in the presence of a catalytic amount of ceric ammonium nitrate in excellent yield. Ketones are found to be unaffected under the reaction conditions. The deprotections of acylals by using water and ceric ammonium nitrate have also been achieved.
- Roy, Subhas Chandra,Banerjee, Biplab
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p. 1677 - 1678
(2007/10/03)
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