Conversion of Oxiranes to Thiiranes Catalyzed with Silica Gel Supported Aluminum Chloride.

ChemInform ◽  
2006 ◽  
Vol 37 (4) ◽  
Author(s):  
K. Parvanak Borujeni
Keyword(s):  
Silica Gel ◽  
Aluminum Chloride

Electrophilic cyclization of an olefinic β-keto ester

1981 ◽  
Vol 59 (14) ◽  
pp. 2239-2241 ◽  
Author(s):  
Margot Alderdice ◽  
Larry Weiler
Keyword(s):  
Silica Gel ◽  
Aluminum Chloride ◽  
Cyclization Reaction ◽  
Electrophilic Cyclization ◽  
Keto Ester ◽  
Potential Use

Benzeneselenenyl chloride and aluminum chloride or benzenesulphenyl chloride and silica gel initiate an electrophilic cyclization of methyl 7-methyl-3-oxo-7-octenoate to cyclohexyl derivatives. These products of the cyclization reaction have been converted into intermediates of potential use in the synthesis of unusual carotenoids.

scholarly journals Development of a New Heterogeneous Lewis Acid Catalyst for Chemoselective Tetrahydropyranylation of Different Hydroxyl Compounds

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Majid Kolahdoozan ◽  
Mahshid Hossaini
Keyword(s):  
Silica Gel ◽  
Lewis Acid ◽  
Aluminum Chloride ◽  
Acid Catalyst ◽  
Significant Loss ◽  
Heterogeneous Surface ◽  
Effective Catalyst ◽  
Triazine Derivative ◽  
Lewis Acid Catalyst ◽  
Hydroxyl Compounds

Amino functionalized triazine supported on silica-gel was prepared and characterized. This new triazine derivative was applied as a coordinating agent for aluminum chloride. This novel Lewis acid supported on heterogeneous surface was used as an effective catalyst for protection of alcohols and phenols in the presence of 3,4-dihydro-2H-pyran. This catalyst can be reused without any significant loss of activity, and it protects alcohols in the presence of phenols.

Activating Effect of Aluminum Chloride in the Technology of Poly-Sulfides and Materials Based on them

2020 ◽  
Vol 299 ◽  
pp. 181-187
Author(s):  
Alsu A. Yusupova ◽  
Aleksey I. Khatsrinov ◽  
Lenar N. Shafigullin
Keyword(s):  
Mechanical Properties ◽  
Oxygen Atom ◽  
Silica Gel ◽  
Aluminum Chloride ◽  
Chemical Interaction ◽  
Cross Linking ◽  
Interphase Interaction ◽  
Interaction Forces ◽  
Tight Contact ◽  
Electrophilic Agent

The paper investigates the influence of an electrophilic agent in the inorganic polysulfide technology. A tight contact between the modified silicate filler and sulfur (when heated and then pressed) results in the appearance of new interatomic bonds and interphase interaction forces to ensure the best possible structure formation in a system in the micro and macro level. Cross-linking of silica gel by disulfide fragments shows greater stability. The activation energies were calculated for insertion of diatomic sulfur (singlet and triplet) by an oxygen atom and a silicon atom, with the substitution of OH-group, as well as for addition of diatomic sulfur to the surface of silica gel modified with aluminum chloride. Aluminum chloride acts as an activator for both a silica-containing material and sulfur, and encourages the chemical interaction between the components, and formation of polysulfides and sulfur materials from them, which have high physical mechanical properties.

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