Superior Performance of NHPI Cocatalyst in the Autoxidation of Methylbenzenes under Solvent-Free Phase Transfer Conditions

作者：Taha Nimer; Sasson Yoel^*

来源：Organic Process Research & Development, 2010, 14(3): 701-704.

DOI：10.1021/op100027s

The novel three-way catalytic system Co(II)/QX/NHPI (QX = lipophilic ammonium salt) is presented as a highly potent promoter for the autoxidation of methylbenzenes to benzoic acids in the absence of a solvent. The key feature of the scheme is the phase transfer of Co(II) and NHPI into the organic phase partially via a hydrogen-bond mechanism. With certain QXs the latter interaction also stabilizes NHPI and prevents its degradation (which is a crucial drawback of this reagent). Ammonium salts that have a tendency to self-assemble in giant multilamellar vesicle (onion) structures, such as DDAB, arc particularly effective in this system.

• 出版日期2010-6
• 单位中国科学院长春应用化学研究所