57547-55-4Relevant academic research and scientific papers
CuCl-catalyzed radical cyclisation of N-α-perchloroacyl-ketene-N,S- acetals: A new way to prepare disubstituted maleic anhydrides
Cornia, Andrea,Felluga, Fulvia,Frenna, Vincenzo,Ghelfi, Franco,Parsons, Andrew F.,Pattarozzi, Mariella,Roncaglia, Fabrizio,Spinelli, Domenico
experimental part, p. 5863 - 5881 (2012/09/22)
The copper-catalyzed radical cyclization (RC) of N-α-perchloroacyl cyclic ketene-N,X(X=O, NR, S)-acetals was studied. While the RC of N-acyl ketene-N,O-acetals was unsuccessful, the 5-endo cyclization of the other ketene acetals provided much better results, with the following order of cyclization efficiency: hexa-atomic cyclic ketene-N,NR-acetalspenta-atomic cyclic ketene-N,S-acetalshexa-atomic cyclic ketene-N,S-acetals. Invariably the catalytic cycle begins with the formation of a carbamoyl methyl radical. This leads to a cascade of reactions, including a radical polar crossover step, which ends with the formation of the maleimide nucleus, or precursors of this. Products from the RC of the hexa-atomic cyclic ketene-N,S-acetals, were efficiently transformed into disubstituted maleic anhydrides.
3-PHENOXY-4-PYRIDAZINOL DERIVATIVE AND HERBICIDE COMPOSITION CONTAINING THE SAME
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Page 199, (2008/06/13)
A compound represented by the formula: wherein R1 represents a hydrogen atom, a halogen atom, alkyl group, etc., ???R2 represents a hydrogen atom, a halogen atom, alkyl group, etc., ???R3, R4, R5, R6 and R7 each independently represent a hydrogen atom, a halogen atom, a substitutable alkyl group, a substitutable alkenyl group, alkynyl group, a substitute-able cycloalkyl group, etc., or adjacent two of R3, R4, R5, R6 and R7 may together with the carbon atoms to which the respective substituents are bonded form a ring which may be substituted, ???m and n each independently represent 0 or 1, a salt thereof or an ester derivative thereof; an agricultural chemical containing the same as an active ingredient; and a herbicidal composition containing the compound and a second herbicidally active compound as active ingredients.
