Montmorillonite K-10 and KSF as remarkable acetylation catalysts

Abstract

Montmorillonite K-10 and KSF catalyse the acetylation of alcohols, thiols, phenols and amines with acetic anhydride in excellent yield.

Argilas como catalisadores verdes na esterificação do colesterol: caracterização espectroscópica e identificação de polimorfos por métodos de análise térmica. Uma proposta laboratorial interdisciplinar para o 1º ciclo universitário

“…16 No primeiro dia de aulas os 6 grupos de trabalho apresentaram oralmente, durante 10 min, a proposta de síntese que iam realizar, assim como o material necessário. Após discussão entre o professor e todos os alunos, acerca do mecanismo da reacção de esterificação, Esquema 1, e sensibilização para questões de desenvolvimento sustentável, envolvendo catalisadores reutilizáveis, deu-se início ao trabalho de síntese.…”

Zeolite Catalysts for Phenol Benzoylation with Benzoic Acid: Exploring the Synthesis of Hydroxybenzophenones

“…In some cases, however, H-Y also showed excellent performances. Other non-zeolitic, but heterogeneous catalysts have also been used, such as: (i) montmorillonites of the K series for the acetylation of various aliphatic and aromatic substrates [47,48] and of aliphatic and aromatic alcohols [49], for the acylation of resorcinol with phenylacetic chloride [50] and after an exchange with various metals for the reaction between aromatic aldehydes and acetic anhydride to produce the corresponding 1,1-diacetates [51]; (ii) silica-supported phosphotungstic acid for the acylation of aromatic hydrocarbons with acrylic and crotonic acid [52,53], for the Fries rearrangement of phenyl benzoate [54] and for the acylation of anisole with acetic anhydride [55,56]; (iii) clay-supported Cs-phosphotungstic acid for the benzoylation of anisole with benzoyl chloride [57], for the benzoylation of p-xylene [58,59] and of phenol with benzoic acid (BA) to obtain p-hydroxybenzophenone (HBP) [60]; (iv) giant P/W heteropolyacids for the acetylation of phenol with acetic anhydride [61] (the reactivity of heteropolyacids for Friedel-Crafts acylation was reviewed by Kozhevnikov [62]), and other P/W polyoxometalates for the acetylation of alcohols and phenols [61]; (v) NaGa-Mg hydrotalcite for the benzoylation of toluene with benzoyl chloride [63,64]; (vi) EPZG ® for the acylation of 1-methoxynaphthalene and anisole with various acyl chlorides and anhydrides [65]; (vii) sulfated zirconia, even promoted with other metal oxides or supported over MCM-41, for the benzoylation of anisole with benzoic anhydride [66][67][68][69][70] or benzoyl chloride [71], for the acylation of phenol, anisole and chlorobenzene with acetic anhydride or benzoic anhydride [72][73][74], for the acylation of veratrole with acetic anhydride [75] and for the Fries rearrangement of 4-methylphenylbenzoate ...…”

Combining Clays and Ultrasound Irradiation for an O-Acetylation Reaction of N-Glucopyranosyl and Other Molecules

“…5 In addition, clays are frequently employed as heterogeneous systems to promote acetylation reaction. 6,7 Specifically, the acylation of alcohols has been carried out using montmorillonite K10 impregnated with some metals, such as FeCl 3 , 6 InCl 3 , 8 and Cu…”