- Preparation method of dichlorotoluene nitride intermediate
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The invention belongs to the technical field of preparation of pesticide intermediates, and particularly discloses a preparation method of a dichlorotoluene nitride intermediate. The preparation method comprises the following steps: fully reacting raw materials, a solvent and a nitration reagent to obtain a dichlorotoluene nitride intermediate, wherein the raw materials comprise any one of o-dichlorotoluene, m-dichlorotoluene and p-dichlorotoluene; the solvent is dichloroethane; the nitration reagent is concentrated nitric acid; the dichlorotoluene nitride intermediate is shown as a chemical formula 7 and a chemical formula 12. The preparation method has the advantages that the corrosion to reaction equipment is less, and the generation and discharge of waste acid and waste salt in the production process are greatly reduced.
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Sheet 0047-0049; 0054; 0065
(2021/01/28)
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- Epoxidation of alkenes under liquid-liquid biphasic conditions: Synthesis and catalytic activity of Mn(III)-tetraarylporphyrins bearing perfluoroalkyl tails
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Four tetraarylporphyrins bearing one n-C8F17 chain on each meso-aryl group have been synthesized, The Mn(III)-complexes of these new compounds (Mn-1 - Mn-4) were used as catalysts in alkene epoxidations carried out under aqueous-organic biphasic conditions. High epoxide yields were obtained with catalysts in which, along with perfluoroalkyl chains, bulky substituents were present at appropriate positions. The expected general enhancement of stability and catalytic activity due to the electron-withdrawing effect of n-C8F17 substituents was not observed. However, Mn-4 was found to be an exceptionally active catalyst for NaOCl promoted epoxidation of poorly reactive linear α-alkenes.
- Pozzi, Gianluca,Colombani, Ida,Miglioli, Massimo,Montanari, Fernando,Quici, Silvio
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p. 6145 - 6162
(2007/10/03)
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