A Doubly Interpenetrated Cu(II)‐based Metal‐Organic Framework as a Heterogeneous Catalyst for the ipso‐Hydroxylation of Arylboronic Acids

Abstract

We dedicate this paper to Professor Rajeev Gupta on the occasion of his 51 st birthday.A doubly interpenetrated Cu(II)-organic framework with formula and 4,4'-bpdc = [1,1'-biphenyl]-4,4'-dicarboxylate ion) has been synthesized and characterized with the help of several spectroscopic and analytical techniques including single crystal X-ray analysis. A single crystal X-ray analysis reveals that 1 exhibit interpene-trated two-dimensional sheet-like structure containing elongated channels of cross-section 11.09 × 31.22 Å 2 along the aaxis. Finally, 1 has been exploited as a heterogeneous catalyst for the ipso-hydroxylation of arylboronic acids yielding up to 99 % of the respective phenolic product. Importantly, the catalyst can be reused for five successive cycles without having a significant loss in its catalytic efficiency.

Ni2P Anchored on Barbituric Acid-Modified Graphitic Carbon Nitride as a Versatile Photocatalyst for Hydroxylation of Aryl Boronic Acids and Oxidation of Benzyl Alcohols

“…Still, oxidative hydroxylation of aryl boronic acids with noble metal catalysts, such as Pd, Au, and Ru, is considered the most efficient approach for phenol production. , Pioneering work by Scaiano and co-workers demonstrated eco-friendly phenol synthesis through visible light irradiation using a homogeneous catalyst system featuring Ru­(bpy) 3 Cl 2 and organic dyes as photocatalysts . Recent research has explored heterogeneous alternatives, including metal–organic frameworks (MOF), covalent organic frameworks (COF), and various transition metal-based photocatalysts, due to challenges in catalyst recovery. − Likewise, the industrial synthesis of benzaldehyde has traditionally favored nonphotocatalytic routes, which can compromise environmental considerations and efficiency. , There is an observable surge toward the exploration of green photocatalytic routes that function in aqueous environments and use ambient air as the oxidizing agent. , …”