- P4VPy–CuO nanoparticles as a novel and reusable catalyst: application at the protection of alcohols, phenols and amines
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P4VPy–CuO nanoparticles were synthesized using ultrasound irradiations. Relevant properties of the synthesized nanoparticles were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. After identification, the prepared reagent was used for the promotion of different types of protection reactions of alcohols, phenols and amines. Easy workup, short reaction times, excellent yields, relatively low cost and reusability of the catalyst are the striking features of the reported methods.
- Shirini, Farhad,Fallah-Shojaei, Abdollah,Abedini, Masoumeh,Samavi, Laleh
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p. 1699 - 1712
(2016/07/27)
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- [InCl4]: An efficient catalyst-medium for alkoxymethylation of alcohols and their interconversion to acetates and TMS-ethers
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A simple, green and chemoselective method for methoxymethylation and ethoxymethylation of primary and secondary alcohols using a Lewis acidic room temperature ionic liquid, [C4mim][InCl4], as catalyst and reaction medium under ambient temperature, microwave and ultrasonic irradiations is reported. In this catalytic system, the corresponding MOM-and EOM-ethers are obtained in excellent yields and in short reaction times. Furthermore, this catalytic system was used for mild and efficient transformations of these protected alcohols to their corresponding acetates and trimethylsilyl ethers under thermal conditions and microwave and ultrasonic irradiations.
- Mohammadpoor-Baltork, Iraj,Moghadam, Majid,Tangestaninejad, Shahram,Mirkhani, Valiollah,Khosropour, Ahmad Reza,Mirjafari, Arsalan
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experimental part
p. 568 - 579
(2012/05/05)
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- Melamine trisulfonic acid (MTSA): A new efficient catalyst for the chemoselective methoxymethylation of alcohols
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Melamine trisulfonic acid, which is easily prepared by the reaction of melamine with neat chlorosulfonic acid, is able to efficiently catalyze the chemoselective methoxymethylation of alcohols with dimethoxymethane (DMM). All reactions were performed unde
- Shirini, Farhad,Zolfigol, Mohammad Ali,Albadi, Jalal
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experimental part
p. 910 - 914
(2010/05/01)
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- A mild and efficient method for the methoxymethylation and acetylation of alcohols promoted by benzyltriphenylphosphonium tribromide
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A mild and efficient method for the conversion of alcohols to their corresponding methoxymethyl ethers and acetates using benzyltriphenylphosphonium tribromide (BTPTB) as catalyst is described. All reactions were performed under completely heterogeneous reaction conditions in good to high yields.
- Shirini, Farhad,Imanzadeh, Gholam Hossein,Mousazadeh, Seyyed Ali Reza,Mohammadpoor-Baltork, Iraj,Abedin, Masoumeh
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experimental part
p. 1187 - 1190
(2011/10/05)
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- Metal hydrogen sulfates catalyzed methoxymethylation of alcohols under solvent-free conditions
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Methoxymethylation of a variety of alcohols was performed by using formaldehyde dimethoxy acetal in the presence of metal hydrogen sulfate M(HSO4)n at room temperature and solvent-free conditions. The methoxymethyl ethers (MOM-ethers
- Niknam, Khodabakhsh,Zolfigol, Mohammad Ali,Shayegh, Mohsen,Zare, Reza
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p. 1067 - 1073
(2008/02/13)
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- Electrochemical oxidation of α-alkoxystannanes
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The introduction of tin on the carbon adjacent to the oxygen of aliphatic ethers results in significant decrease in the oxidation potentials. The effect of tin is much larger than that observed for silicon. Preparative electrochemical oxidation of α-alkoxystannanes results in selective cleavage of the carbontin-bond and introduction of a nucleophile such as an alcohol onto the carbon.
- Yoshida, Jun-Ichi,Ishichi, Yuji,Nishiwaki, Keiji,Shiozawa, Satoshi,Isoe, Sachichiko
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p. 2599 - 2602
(2007/10/02)
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- Dimethylboron Bromide and Diphenylboron Bromide: Cleavage of Acetals and Ketals
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The cleavage of various acetal and ketal derivatives by the use of dialkyl- and diarylboron halides is described.Acetals and ketals readily react with dimethylboron bromide or diphenylboron bromide at -78 deg C to give the corresponding carbonyl compounds in excellent yield.Under similar reaction conditions MEM, MOM, and MTM ethers are smoothly converted to alcohols.Acetonides are also cleaved with dimethylboron bromide while THP and THF ethers and methyl glycosides react at room temperature.Mechanistic considerations of the cleavage reactions are presented.The chemoselective virtues of dimethylboron bromide are summarized.
- Guindon, Yvan,Yoakim, Christiane,Morton, Howard E.
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p. 3912 - 3920
(2007/10/02)
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- DIMETHYLBORON BROMIDE AND DIPHENYLBORON BROMIDE. ACETAL AND KETAL CLEAVAGE. CLEAVAGE OF MEM, MOM AND MTM ETHERS.
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A general and efficient procedure for the cleavage of acetals and ketals by the use of dimethylboron bromide or diphenylboron bromide is described.Under similar reaction conditions, MEM, MOM and MTM ethers also react to afford the parent alcohols in excellent yields.
- Quindon, Yvan,Morton, Howard E.,Yoakim, Christiane
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p. 3969 - 3972
(2007/10/02)
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