23702-54-7Relevant articles and documents
Bis(3,4-dimethoxybenzyl) ether and tetramethoxy-4,4′-(2,3-dimethyltetramethylene)-dipyrocatechol
Fun, Hoong-Kun,Chinnakali, Kandasamy,Sivakumar, Kandasamy,Sam, Teng-Wah,How, Siew-Eng
, p. 1857 - 1859 (1997)
In molecules of both bis(3,4-dimethoxybenzyl) ether, C18H22O5, (I), and meso-tetramethoxy-4,4′-(2,3-dimethyltetramethylene)dipyrocatechol, C22H30O4, (II), the methoxy groups are almost copl
Synthesis of cycloveratrylene macrocycles and benzyl oligomers catalysed by bentonite under microwave/infrared and solvent-free conditions
Miranda, Rene,Valencia-Vazquez, Omar,Maya-Vega, Carlos Abel,Nicolas-Vazquez, Ines,Vargas-Rodriguez, Yolanda Marina,Morales-Serna, Jose Antonio,Garcia-Rios, Erendira,Salmon, Manuel
, p. 12820 - 12844 (2013/11/06)
Tonsil Actisil FF, which is a commercial bentonitic clay, promotes the formation of cycloveratrylene macrocycles and benzyl oligomers from the corresponding benzyl alcohols in good yields under microwave heating and infrared irradiation in the absence of solvent in both cases. The catalytic reaction is sensitive to the type of substituent on the aromatic ring. Thus, when benzyl alcohol was substituted with a methylenedioxy, two methoxy or three methoxy groups, a cyclooligomerisation process was induced. Unsubstituted, methyl and methoxy benzyl alcohols yielded linear oligomers. In addition, computational chemistry calculations were performed to establish a validated mechanistic pathway to explain the growth of the obtained linear oligomers.
Electrostatic catalysis by ionic aggregates: Scope and limitations of Mg(ClO4)2 as acylation catalyst
Chakraborti, Asit K.,Sharma, Lalima,Gulhane, Rajesh,Shivani
, p. 7661 - 7668 (2007/10/03)
Alkali and alkaline earth metal perchlorates exhibit electrostatic catalysis in the activation of anhydrides for the acylation reaction. Perchlorates with higher values of the charge-size function of the metal ion exhibit better catalytic activity following the order Mg(ClO4) 2>Ba(ClO4)2>LiClO4. Acylation of structurally diverse phenols, thiols, alcohols, and amines have been carried out with stoichiometric amounts of anhydride at room temperature under solvent free conditions in the presence of catalytic amount of Mg(ClO4) 2. Sterically hindered and electron deficient phenols are efficiently acylated. Acylation with sterically hindered anhydrides such as iso-butyric, pivalic, and benzoic anhydrides are carried out with phenols and alcohols in excellent yields. Acid-sensitive alcohols are acylated in excellent yields without any competitive side reactions.