51282-49-6Relevant articles and documents
Preparation method of nitrobenzoate
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Paragraph 0041-0045; 0056; 0057, (2020/07/15)
The invention relates to the field of pesticides, and particularly discloses a preparation method of nitrobenzoate, wherein the structure of the nitrobenzoate is represented by a formula (2). The preparation method of the nitrobenzoate comprises the step that in the presence of a halogenated hydrocarbon organic solvent, a compound with a structure represented by the formula (1) makes contact withfuming nitric acid, fuming sulfuric acid and acetic anhydride, wherein in the formula (1) and the formula (2), X represents halogen, and R represents alkyl with the carbon atom number being 1-8. According to the method, the amount of waste acid can be reduced, and nitrobenzoate can be obtained at high yield.
Tuning a robust system: N,O zinc guanidine catalysts for the ROP of lactide
Sch?fer, Pascal M.,McKeown, Paul,Fuchs, Martin,Rittinghaus, Ruth D.,Hermann, Alina,Henkel, Johanna,Seidel, Sebastian,Roitzheim, Christoph,Ksiazkiewicz, Agnieszka N.,Hoffmann, Alexander,Pich, Andrij,Jones, Matthew D.,Herres-Pawlis, Sonja
, p. 6071 - 6082 (2019/05/17)
Non-toxic, highly active and robust complexes are the holy grail as ideal green catalysts for the polymerisation of biorenewable and biodegradable polylactide. Four new zinc guanidine complexes [ZnCl2(TMG4NMe2asme)], [ZnCl2(TMG5Clasme)], [ZnCl2(TMG5Measme)] and [ZnCl2(TMG5NMe2asme)] with different electron-donating and electron-withdrawing groups on the ligand's aromatic backbone have been synthesised. Ligands are derived from low-cost commercially available compounds and have been converted by a three- or four-step synthesis process into the desired ligand in good yields. The compounds have been fully characterised and tested in the ROP of rac-LA under industrially relevant conditions. The complexes are based on the recently published structure [ZnCl2(TMGasme)] which has shown high activity in the polymerisation of lactide at 150 °C. Different substituents in the para-position of the guanidine moiety significantly increase the polymerisation rate whereas positioning substituents in the meta-position causes no change in the reaction rate. With molecular weights over 71000 g mol-1 being achievable, the best system produces polymers for multiple industrial applications and its polymerisation rate approaches that of Sn(Oct)2. The robust systems are able to polymerise non-purified lactide. The initiation of the polymerisation is suggested to occur due to impurities in the monomer.
PROCESS FOR PREPARING TOLVAPTAN INTERMEDIATES
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Page/Page column 6, (2012/04/23)
The present invention provides a novel process for the preparation of 7-chloro-2,3,4,5-tetrahydro-1H-1-benzazepin-5-one. The present invention also provides an improved process for the preparation of 7-chloro-1-(2-methyl-4-nitrobenzoyl)-5-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine. The present invention further provides an improved process for the preparation of 7-chloro-1-[2-methyl-4-[(2-methylbenzoyl)amino]benzoyl]-5-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine.
