54458-84-3Relevant articles and documents
Pyrazine compound and application thereof
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, (2019/07/04)
The invention discloses a pyrazine compound and application thereof. In particular, the present invention provides a compound represented by the formula (I), wherein the extractant composed of the compound has a high extraction rate for lithium ions, and the organic phase is easy to enrich lithium-7 isotopes, so as to realize the extraction and separation of lithium isotopes.
A New Convenient Synthesis of Alkoxyanthracenes from Alkoxy-9,10- anthraquinones
Lu, Lingang,Chen, Qiyin,Zhu, Xiaozhang,Chen, Chuanfeng
, p. 2464 - 2466 (2007/10/03)
Methoxy-9,10-anthraquinones with mono-, di- and tetraether groups at different positions 1a-h can be directly reduced to the corresponding methoxyanthracenes 3a-h in moderate to good yields by zinc in refluxing acetic acid. Under similar conditions, ethyl 1′-anthracenoxyacetate (3i) with the ester group unaffected and 1,8-oxybis(ethyleneoxyethyleneoxy)anthracene (5) were also conveniently synthesized in 65 and 70% yields, respectively.
Process for the selective production of dihydroxybenzenes
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, (2008/06/13)
The known nuclear hydroxylation of phenol or substituted phenols or phenol ethers with organic solutions of hydrogen peroxide in the presence of a catalyst is carried out in improved manner by employing both (1) a special, practically water free solution of hydrogen peroxide in an organic solvent which forms an azeotrope with water, which azeotrope boils below the boiling point of hydrogen peroxide, and (2) selenium dioxide as a catalyst. Through this, the nuclear hydroxylation is substantially simpler than previously. Besides, for the first time, it is possible to control the ortho to para ratio or the two ortho ratios to each other.