151-05-3Relevant articles and documents
TEMPERATURE DEPENDENCE OF ACTIVATION VOLUME FOR ACETOLYSIS OF 2-ARYL-2-METHYLPROPYL TOSYLATES
Sera, Akira,Yamada, Hiroaki,Masaki, Hitoshi
, p. 1533 - 1536 (1980)
The activation volume of the acetolysis of the title compounds was found to have an unexpectedly large temperature dependence.The activation volume-temperature profile of a steep concave was observed which was responsible for the previously reported anomaly of the substituent dependence of the activation volume.
L-pyrrolidine-2-carboxylic acid-4-hydrogen sulfate (supported on silica gel) as a new and efficient catalyst for acylation of alcohols, phenols and amines under solvent-free conditions
Hajjami, Maryam,Ghorbani-Choghamarani, Arash,Khani, Zahra
, p. 324 - 329 (2013/07/26)
In the present work, L-pyrrolidine-2-carboxylic acid-4-hydrogen sulfate, supported on silica gel was prepared and characterized by Mass spectroscopy, 1H NMR, 13CNMR, FT IR and elemental analysis (CHN) methods. This heterogenized catalyst can be used as an efficient catalyst for the acylation of alcohols, phenols, and amines with acetic anhydride under mild and solvent-free conditions. Simple work-up, stability of the catalyst, nontoxicity and good to high yields are the advantages of this work.
Sonochemical synthesis of silica and silica sulfuric acid nanoparticles from rice husk ash: A new and recyclable catalyst for the acetylation of alcohols and phenols under heterogeneous conditions
Salavati-Niasari, Masoud,Javidi, Jaber
, p. 705 - 712 (2013/02/22)
Silica nanoparticles were synthesized from rice husk ash at room temperature by sonochemical method. The feeding rate of percipiteting agent and time of sonication were investigated. The nanostructure of the synthesized powder was realized by the FE-SEM photomicrograph, FT-IR spectroscopy, XRD and XRF analyses. These analytical observations have revealed that the nano-sized amorphous silica particles are formed and they are spheroidal in shape. The average particle size of the silica powders is found to be around 50 nm. The as-synthesized silica nanoparticles were subsequently modified with chlorosulfonic acid and prepared silica sulfuric acid nanoparticles, which were employed as an efficient catalyst for the acylation of alcohols and phenols with acetic anhydride in excellent yields under solvent-free conditions at room temperature. This reported method is simple, mild, and environmentally viable and catalyst can be simply recovered and reused over 9 times without any significant loss of its catalytic activity.
