Xn:Harmful;32690-28-1Relevant articles and documents
5,6-dinitrobenzimidazole compound as well as synthesis method and application thereof
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, (2020/08/09)
The invention discloses a 5,6-dinitrobenzimidazole compound shown as a formula (I). The synthesis method of the compound comprises the following steps: firstly, performing amino protection, nitrification and deprotection on o-phenylenediamine to prepare a compound shown as a formula (V), and finally, reacting the compound shown as the formula (V) with a compound shown as a formula (VI) to obtain aproduct, namely the 5,6-dinitrobenzimidazole compound shown as the formula (I). The 5,6-dinitrobenzimidazole compound and the method have the main beneficial effects that: the preparation method hasthe advantages of short route, easily available raw materials, simple process, mild reaction conditions and the like, meanwhile, the application of the 5,6-dinitrobenzimidazole compound in third-ordernonlinear optics is developed, and the 5,6-dinitrobenzimidazole compound has relatively high implementation value and good social and economic benefits.
BIMETALLIC COMPLEXES AND THE USE THEREOF IN PRODUCING DIARYL CARBONATE
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, (2013/03/26)
The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.
Synthesis of amino- and bis(bromomethyl)-substitued bi- and tetradentate N-heteroaromatic ligands: Building blocks for pyrazino-functionalized fullerene dyads
Kleineweischede, Andreas,Mattay, Jochen
, p. 947 - 957 (2007/10/03)
In this paper we describe the synthesis of amino- and bis(bromomethyl)- substituted derivatives of phenanthrofine (phen), pyrazino[2,3-f]-phenanthroline (pphen), dipyrido[3,2-a:2′,3′-c]phenazine (dppz), pyrazino[2,3-i]dipyrido[3,2-a:2′,3′-c]phenazine, 2,3-bis(2-pyridyl)pyrazine (dpp), 2,3-bis(2-pyridyl)quinoxaline (dpq) and 7,8-bis(2-pyridyl)pyrazino[2,3-g]quinoxaline. These substituted bi- and tetradentate N-heteroaromatic ligands are potential synthons for the preparation of the fullerene ligands 4-9. The diketones, 1,10-phenanthroline-5,6-dione 11a (phendione), 2,2-pyridyl 11b and 1,4-dibromo-2,3-butanedione 33 were used as starting materials. Phendione was converted into the phendiamine 13 by a two-step synthesis via the dioxime of the diketone 11a. Amino-substituted dppz and dpq derivatives were obtained by the reduction of the corresponding nitro compounds that were obtained by the Schiff base condensation of the diketones 11a and 11b and the appropriate o-phenylenediamine derivatives. An alternative synthetic route to the diamines 20a and 20b by detosylation of the diamino-substituted dppz and dpq ligands is also presented. Synthesis of the bis(bromomethyl)-substituted pphen, dpp, dppz and dpq derivatives was performed by the photochemical addition of bromine. Alternatively, synthesis of the bis(bromomethyl)-substituted pphen, pdppz and pdpq is also possible by the condensation of 1,4-dibromo-2,3-butanedione 33 and phendiamine or the diamino-substituted dppz and dpq derivatives. The latter two compounds can be also prepared by the condensation of diketones 11a and 11b with 6,7-diamino-2,3-bis(bromomethyl)-quinoxaline. Although the synthesis of some dppz and dpq ligands is already published, we herein present improved or alternative synthetic strategies leading to higher yields and/ or higher purity of these N-heteroaromatic ligands. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
