Surface photochemistry of the herbicide napropamide. The role of the media and environmental factors in directing the fates of intermediates
Surface photochemistry of the herbicide napropamide. The role of the media and environmental factors in directing the fates of intermediates
复制标题
除草剂敌草胺的表面光化学。
DOI：
10.1039/b713369c
复制
发表时间：
2008
影响因子：
3.1
通讯作者：
R. Weiss
中科院分区：
文献类型：
--
作者：
J. P. Da Silva;Edgar V Bastos;L. Ferreira;R. Weiss
用稳态和激光闪光漫反射技术研究了除草剂敌草胺在纤维素和二氧化硅表面的光化学行为。结果被用来探索主体基质的反应位置如何影响光反应路径。当两种固体载体上的紫外线(灯)或可见光(阳光)照射时，丙胺发生反应。中间体和最终产品的性质在很大程度上取决于分子氧的存在与否。用时间分辨发光光谱和瞬时吸收光谱检测了敌草胺吸附在纤维素上的三重态。在二氧化硅上没有观察到三重态，但在闪光光解研究中检测到了包括分子氧参与的瞬变。在两种固体上都观察到了光克莱森重排产物的酮基中间体。光-克莱森反应生成的取代1-萘酚和1-萘酚是主要的反应产物。1，4-萘醌是在分子氧存在下的一种主要光产物，当萘丙胺在环境中进行光降解(即在植物和田间使用后)时，1，4-萘醌有望普遍存在。
The photochemical behaviour of the herbicide napropamide is studied on cellulose and silica surfaces, using steady-state and laser-flash diffuse reflectance techniques. The results are used to probe how the reaction sites of the host matrices influence the photo-reactive pathways. Napropamide undergoes reaction when irradiated with UV (lamps) or visible (sunlight) radiation on both solid supports. The nature of the intermediates and final products depend strongly on the presence or absence of molecular oxygen. The triplet state of napropamide adsorbed on cellulose is detected by both time-resolved luminescence and transient absorption spectroscopies. The triplet sate was not observed on silica, but transients which include the participation of molecular oxygen are detected during flash photolysis studies. The keto intermediates of the photo-Claisen rearrangement products are observed on both solids. Substituted 1-naphthols from photo-Claisen reactions and 1-naphthol are among the main reaction products. 1,4-Naphthoquinone is a major photoproduct in the presence of molecular oxygen and is expected to be prevalent when napropamide undergoes photodegradation in the environment ( i.e. , after being applied to plants and fields).
2,4-二甲基萘-1-基和 1,4-二甲基萘-2-基 2,4,6-三甲基苯甲酸酯光弗赖斯重排中环己二烯酮中间体的分离
DOI：
--
发表时间：
2004
期刊：
Chem.Lett. 33(3)
影响因子：
--
作者：
Tadashi Mori;Makoto Takamoto;Hideaki Saito;Takahiro Furo;Takehiko Wada;Yoshihisa Inoue
通讯作者：
Yoshihisa Inoue