benzoins in the presence of the heterogeneous catalyst, Co 3 O 4 –CNTs nanocomposite, has been developed. It thus constitutes a very simple, clean, economical and selective method for the aerobic preparation of benzils from the corresponding benzoins. The catalyst can be re-used a number of times without losing its catalytic activity to a greater extent.
摘要 在多相催化剂 Co 3 O 4 -CNTs 纳米复合材料存在下,已开发出一种高效、简便的安息香空气氧化方法。因此,它构成了一种非常简单、清洁、经济和选择性的方法,用于从相应的安息香有氧制备苯偶姻。催化剂可以重复使用多次,而不会在更大程度上失去其催化活性。
Photolabile blocked surfactants and compositions containing the same
申请人:Minnesota Mining and Manufacturing Company
公开号:US04478967A1
公开(公告)日:1984-10-23
Surfactants which are blocked against surfactant action (identified herein as "photolabile blocked surfactants") by a photolabile protective or masking group but which, on exposure to actinic radiation, become unblocked are provided. Coating compositions in which surfactant is formed on irradiation are provided by blending the photolabile blocked surfactant with polymeric film-forming materials. Compositions containing the photolabile blocked surfactants are useful when employed as protective coatings on various substrates or as the adhesive in a pressure sensitive adhesive tape. Although initially well adhering to a substrate, such compositions may be readily removed from the substrate following exposure of the same to suitable radiation which unblocks the surfactant to permit it to regain its surfactant activity.