A cost-effective method for the selective oxidation of toluene to benzaldehyde was developed based on immobilized CoO_x on SiO₂ catalyst with predominating cobaltous ions in the presence of N-hydroxyphthalimide (NHPI) and hexafluoropropan-2-ol (HFIP) using ambient molecular oxygen at room temperature. A toluene conversion of 91% and a selectivity to benzaldehyde of 68% were realized. HFIP was confirmed to work as a restraining agent against the further oxidation of benzaldehyde to benzoic acid on the immobilized CoO_x/SiO₂ catalyst in the presence of NHPI and HFIP.

中文翻译：

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在N-羟基邻苯二甲酰亚胺和六氟丙烷-2-醇存在下，在SiO ₂催化剂上固定的CoO _x上甲苯选择性好氧氧化为苯甲醛

基于固定的CoO开发了用于甲苯到苯甲醛的选择性氧化甲成本有效的方法_X上的SiO ₂催化剂使用环境分子在N-羟基苯邻二甲酰亚胺（NHPI）和六氟丙-2-醇（HFIP）的存在为主的钴离子在室温下氧气。实现了91％的甲苯转化率和68％的苯甲醛选择性。证实HFIP在NHPI和HFIP的存在下可作为抑制剂，防止苯甲醛进一步在固定化的CoO _x / SiO ₂催化剂上进一步氧化为苯甲酸。