Microbial Degradation of Oxadiazon by Soil Fungus Fusarium solani
作者:Subhasish K. Chakraborty、Ashim Chowdhury、Anjan Bhattacharyya、Swapan Ghosh、Sitangsu Pan、Rolland Waters、Narayan Adityachaudhury
DOI:10.1021/jf00059a035
日期:1995.11
Degradation of oxadiazon [2-tert-butyl-4-(2,4-dichloro-5-isopropoxyphenyl-Delta(2)-1,3,4-oxadiazolin-5-one (1)], a preemergent soil-applied herbicide, by a soil fungus, Fusarium solani (Mortius) Sacc., has been investigated. F. solani, isolated from soil by enrichment culture technique, degraded the herbicide 1 by cometabolic process. Eleven metabolites have been isolated, out of which three metabolites (M(1), M(2), and M(3)) were characterized by spectroscopic evidence. Metabolites M(1) and M(3) are reported for the first time as metabolites of oxadiazon. The main metabolic pathways involve oxadiazoline ring cleavage without dechlorination reaction.
1,3-Dipolar Cycloaddition of Nitrile Imine with Carbon Dioxide: Access to 1,3,4-Oxadiazole-2(3<i>H</i>)-ones
作者:Chun-Xiao Guo、Wen-Zhen Zhang、Ning Zhang、Xiao-Bing Lu
DOI:10.1021/acs.joc.7b00963
日期:2017.7.21
Efficient synthesis of 1,3,4-oxadiazole-2(3H)-one was achieved by CsF/18-crown-6 mediated 1,3-dipolar cycloaddition of nitrile imine and 2.0 MPa of CO2. CsF/18-crown-6 played a key role in enhancing the reactivity of CO2 as a 1,3-dipolarophile. The practical utility of this transition-metal-free approach to 1,3,4-oxadiazole-2(3H)-one is highlighted by the convenient synthesis of a commercial herbicide