Evaluation of Synthetic Methods for Bismuth(III) Oxide Polymorphs: Formation of Binary versus Ternary Oxides

2016 ◽  
Vol 16 (10) ◽  
pp. 5678-5688 ◽  
Author(s):  
Marcus Weber ◽  
Maik Schlesinger ◽  
Michael Mehring
Keyword(s):  
Synthetic Methods ◽  
Binary Versus ◽  
Ternary Oxides

Revisiting the High Pressure Ternary Oxides of Cr(IV): Structures and Microstructures

2008 ◽  
Author(s):  
Miguel ïngel. Alario-Franco ◽  
Elizabeth Castillo-Martinez ◽  
Angel M. Arevalo-Lopez
Keyword(s):  
High Pressure ◽  
Ternary Oxides

Double Ring-Closing Approach for the Synthesis of 2,3,6,7-Substituted Anthracene Derivatives

2020 ◽  
Author(s):  
Birgit Meindl ◽  
Katharina Pfennigbauer ◽  
Berthold Stöger ◽  
Martin Heeney ◽  
Florian Glöcklhofer
Keyword(s):  
Wittig Reaction ◽  
Condensation Reaction ◽  
Synthetic Methods ◽  
Anthracene Derivative ◽  
Double Ring ◽  
Mild Conditions ◽  
Wide Range ◽  
Anthracene Derivatives

Anthracene derivatives have been used for a wide range of applications and many different synthetic methods for their preparation have been developed. However, despite continued synthetic efforts, introducing substituents in some positions has remained difficult. Here we present a method for the synthesis of 2,3,6,7-substituted anthracene derivatives, one of the most challenging anthracene substitution patterns to obtain. The method is exemplified by the preparation of 2,3,6,7-anthracenetetracarbonitrile and employs a newly developed, stable protected 1,2,4,5-benzenetetracarbaldehyde as the precursor. The precursor can be obtained in two scalable synthetic steps from 2,5-dibromoterephthalaldehyde and is converted into the anthracene derivative by a double intermolecular Wittig reaction under very mild conditions followed by a deprotection and intramolecular double ring-closing condensation reaction. Further modification of the precursor is expected to enable the introduction of additional substituents in other positions and may even enable the synthesis of fully substituted anthracene derivatives by the presented approach.<br>

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