An efficient method for the silylation of hydroxyl groups with hexamethyldisilazane (HMDS) catalyzed by aluminum tris(dihydrogen phosphate) under solvent-free and ambient conditions

2008 ◽  
Vol 86 (8) ◽  
pp. 841-845 ◽  
Author(s):  
Hamid Reza Shaterian ◽  
Majid Ghashang ◽  
Nassrin Tajbakhsh Riki ◽  
Manijeh Asadi
Keyword(s):  
Heterogeneous Catalyst ◽  
Efficient Method ◽  
Room Temperature ◽  
Solvent Free ◽  
Dihydrogen Phosphate ◽  
Hydroxyl Groups ◽  
Ambient Conditions ◽  
Solvent Free Conditions ◽  
Free Hydroxyl ◽  
Recyclable Heterogeneous Catalyst

A highly efficient and mild procedure for the trimethylsilylation of a wide variety of alcohols, including primary, benzylic, secondary, hindered secondary, tertiary, phenols, and oximes with hexamethyldisilazane (HMDS), using Al(H2PO4)3 as a recyclable heterogeneous catalyst at room temperature in a few minutes with excellent yields under solvent-free conditions is described.Key words: trimethylsilylation, hexamethyldisilazane, aluminum tris(dihydrogen phosphate) [Al(H2PO4)3], solvent-free, hydroxyl groups.

PMA/SiO2 – An efficient recyclable heterogeneous catalyst for the synthesis of homoallyl alcohols and amines under solvent-free conditions

2008 ◽  
Vol 86 (7) ◽  
pp. 709-713 ◽  
Author(s):  
Biswanath Das ◽  
Rathod Aravind Kumar ◽  
Ponnaboina Thirupathi ◽  
Kanaparthy Suneel ◽  
Pothkan Sunitha
Keyword(s):  
Heterogeneous Catalyst ◽  
Nucleophilic Addition ◽  
Room Temperature ◽  
Addition Reaction ◽  
Phosphomolybdic Acid ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Nucleophilic Addition Reaction ◽  
Recyclable Heterogeneous Catalyst

Aldehydes and imines can efficiently undergo nucleophilic addition reaction with allyltributylstannane in the presence of phosphomolybdic acid supported on silica (PMA/SiO2) under solvent free-conditions to form the corresponding homoallyl alcohols and amines respectively at room temperature in excellent yields. The catalyst can be easily recovered and re-used.Key words: homoallyl alcohol, homoallyl amine, phosphomolybdic acid, heterogeneous catalyst, allyltributylstannane, solvent-free conditions.

H-β-zeolite catalyzed transamidation of carboxamides, phthalimide, formamides and thioamides with amines under neat conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 95313-95317 ◽  
Author(s):  
Sadu Nageswara Rao ◽  
Darapaneni Chandra Mohan ◽  
Subbarayappa Adimurthy
Keyword(s):  
Heterogeneous Catalyst ◽  
Solvent Free ◽  
Β Zeolite ◽  
Solvent Free Conditions ◽  
Recyclable Heterogeneous Catalyst

Efficient transamidation of unactivated carboxamides, phthalimides, formamides and thioamides with amines under solvent-free conditions using H-β-zeolite as a green and recyclable heterogeneous catalyst is described.

A multicomponent reaction on a ‘free’ KCC-1 catalyst at room temperature under solvent free conditions by visible light

RSC Advances ◽  
2016 ◽  
Vol 6 (59) ◽  
pp. 54236-54240 ◽  
Author(s):  
Seyed Mohsen Sadeghzadeh
Keyword(s):  
Visible Light ◽  
Multicomponent Reaction ◽  
Efficient Method ◽  
Room Temperature ◽  
Solvent Free ◽  
Green Protocol ◽  
Mild Conditions ◽  
Solvent Free Conditions

A green and efficient method for the synthesis of various triazolo[1,2-a]indazoletrione under mild conditions is reported, that making it a genuinely green protocol.

scholarly journals Technological Aspects of Highly Selective Synthesis of Allyloxyalcohols—New, Greener, Productive Methods

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1559
Author(s):  
Magdalena Urbala
Keyword(s):  
Allyl Chloride ◽  
Industrial Applications ◽  
Solvent Free ◽  
Pt Catalyst ◽  
Hydroxyl Groups ◽  
Equimolar Ratio ◽  
Allyl Ethers ◽  
Solvent Free Conditions ◽  
Free Hydroxyl ◽  
By Products

Allyl ethers bearing free hydroxyl groups of CH2=CH-CH-O-A-OH type (hydroxyalkyl allyl ethers, allyloxyalcohols) are valuable chemicals in many environmentally friendly industrial applications. The development of technologically attractive methods for their production is necessary. The two pathways (L-L PTC and non-catalytic solvent-free conditions) were optimized for the highly selective and yield synthesis of 4-allyloxybutan-1-ol. Improvements in the PTC method (50% NaOH(aq), the equimolar ratio of NaOH to diol, cyclohexane as solvent) with a new highly selective and effective PT catalyst, i.e., Me(n-Oct)3N+Br− (0.3 mol%), resulted in 88% yield and 98% selectivity of 4-allyloxybutan-1-ol with minimal formation of allyl chloride hydrolysis by-products (<1%). In turn, application of non-catalytic solvent-free conditions and the change in the key substrate with an excess of diol and use of solid NaOH solely led to a mono-O-allylation product with an excellent yield of 99% in a relatively short reaction time (3.5 h), with trace amounts of by-products (<0.1%). This sustainable method is perfectly suitable for the synthesis on a larger scale (3 moles of the key substrate) and for the full O-allylation process.

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