Synthesis and reactivity studies on alkyl–aryloxo complexes of nickel containing chelating diphosphines: cyclometallation and carbonylation reactions
摘要:
Nickel alkyl-aryloxo complexes of composition Ni(R)(O-C(6)Hl(3)-2,6-Me-2)(P-P) (R=CH2SiMe3, CH3, CH2CMe2Ph; P-P =PPr'(2)(CH2)(n)PPr'(2), n=2 (dippe) or 3 (dippp)) have been synthesized. While the (trimethylsilyl)methyl and the methyl derivatives are stable in solution at room temperature, the bis-neophyl (R = CH2CMe2Ph) complexes undergo a cyclometallation reaction that leads to the metallacvcles N together with 2,6-dimethylphenol. The alkyl-aryloxo complexes cleanly react with carbon monoxide giving products resulting from CO insertion and reductive elimination, i.e. Ni(CO)(2)(P-P) and the corresponding 2.6-dimethylphenyl carboxylates quantitatively. (C) 2002 Elsevier Science B.V. All rights reserved.
Bismuth Oxide Perchlorate as a Highly Efficient Catalyst for Heteroatom Acylation Under Solvent-Free Conditions
作者:Asit K. Chakraborti、Rajesh Gulhane、Shivani
DOI:10.1055/s-2003-41442
日期:——
Bismuth oxide perchlorate efficiently catalyzes the acetylation of structurally diverse phenols, alcohols, thiols, and amines undersolventfree conditions. Sterically hindered and electron deficient phenols are acetylated in excellent yields with stoichiometric amounts of Ac 2 O at room temperature. Acylation of acid-sensitive alcohols is carried out efficiently without competitive side reactions
高氯酸铋在无溶剂条件下有效催化结构不同的酚、醇、硫醇和胺的乙酰化。空间位阻和缺电子酚在室温下用化学计量的 Ac 2 O 以极好的收率乙酰化。酸敏感醇的酰化可以有效地进行,没有竞争性副反应。光学活性底物被乙酰化,对光学纯度没有任何不利影响。
Silver Triflate Catalyzed Acetylation of Alcohols, Thiols, Phenols, and Amines
作者:Debashis Chakraborty、Rima Das
DOI:10.1055/s-0030-1259999
日期:2011.5
variety of alcohols, thiols, phenols, and amines were subjected to acetylation reaction using acetic anhydride in the presence of catalytic quantity of silver triflate. The method described has a wide range of applications, proceeds under mild conditions, does not involve cumbersome workup, and the resulting products are obtained in high yields within a reasonable time. acetylation - silver triflate -
Reusable and efficient polyvinylpolypyrrolidone-supported triflic acid catalyst for acylation of alcohols, phenols, amines, and thiols under solvent-free conditions
prepared and fully characterized by FT-IR, TGA, and SEM. This super acidic solid catalyst shows high catalytic activity for selective acylation of alcohols, phenols, amines, and thiols with anhydrides undersolvent-freeconditions at room temperature. In addition, this method features an easy to handle solid super acid catalyst and an operationally simple procedure, affording the desired acylated products
AbstractAn efficient method for the acetylation of a wide range of alcohols as well as phenols with acetic anhydride in good to excellent yields undersolvent-freeconditions, using zinc zirconium phosphate as the catalyst was investigated. The catalyst was characterized by XRD, inductivity coupled plasma-optical emission spectroscopy, and scanning electron microscope. Products are easily isolated
Acetylation of alcohols and phenols under solvent-free conditions using iron zirconium phosphate
作者:Abdol R. Hajipour、Hirbod Karimi、Amir Masti
DOI:10.1016/s1872-2067(14)60280-1
日期:2015.4
Ironzirconiumphosphate (ZPFe) nanoparticles were found to function as an efficient catalyst for the acetylation of a wide range of alcohols and phenols using acetic anhydride, generating good to excellent yields under solvent-free conditions. The steric and electronic properties of various substrates had a significant influence on the reaction conditions required to achieve the acetylation. The catalyst