Preparation of sulfuric acid ([3-(3-silicapropyl)sulfanyl]propyl)ester: A new and recyclable catalyst for the formylation and acetylation of alcohols under heterogeneous conditions

M(acac)n Covalently Anchored onto Amine Functionalized Silica: Highly Efficient and Recyclable Heterogeneous Catalysts for the Acetylation of Amines, Phenols and Alcohols Under Solvent-Free Conditions

“…These catalysts offer advantages over noncovalent analogues such as increased stability in harsh reaction conditions due to stronger bonding forces between *Address correspondence to this author at the Department of Chemistry, University of Jammu, Jammu-180 006, India; Tel: +91-191-2453841; Fax: +91-191-2431365; E-mail: paul7@rediffmail.com support and catalyst. The immobilized catalysts are stable and leach proof, since covalent bonds are formed between the solid support and metal complex [27][28][29]. With a stronger attachment, there is less aggregation and loss of single site nature.…”

Silica‐bonded S‐Sulfonic Acid: A Recyclable Catalyst for the Synthesis of Trisubstituted Imidazoles under Solvent‐free Conditions

“…2 Application of solid acids in organic transformation has important roles, because these species have many advantages such as simplicity in handling, decreased reactor and plant corrosion problems, and more environmentally safe disposal. [3][4][5][6][7][8][9] It is clear that green chemistry not only requires the use of environmentally benign reagents and solvents, but also the recovery and reuse of the catalyst. One way to overcome the problem of recyclability of the traditional acid catalyst is to chemically anchor the reactive center onto a large surface area inorganic solid carrier to create a new organic-inorganic hybrid catalyst.…”

Silica immobilized sulfuric acid ([3-(propyl)sulfanyl]propyl]ester andN-propylsulfamic acid as recyclable catalysts for chemoselective synthesis of 1,1-diacetates

“…All the products are known compounds and were characterized by comparison of their IR, 1 H NMR, and 13 C NMR spectroscopic data and their melting points with reported values (10Á25). Silica immobilized sulfuric acid ([3-(propyl)sulfanyl]propyl]ester (I)) and silicabonded N-propylsulfamic acid (II) were prepared according to our previously reported procedures (51,52).…”