o-Quinonoid Heterocycles: Synthesis and Crystal Structure of 2,3-Dicyano-5,7-bismethylthieno3,4-bpyrazineReportar como inadecuado


o-Quinonoid Heterocycles: Synthesis and Crystal Structure of 2,3-Dicyano-5,7-bismethylthieno3,4-bpyrazine


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1

Department of Chemistry, Norwegian University of Science and Technology, N-7491 Trondheim, Norway

2

Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway





*

Authors to whom correspondence should be addressed.



Abstract 2,3-Dicyano-5,7-bismethylthieno3,4-bpyrazine 5, has been obtained as a minor product from reactions of S-nucleophiles with 5,6-di1-bromoethylpyrazine-2,3- dicarbonitrile 3, or from a condensation of 4-hydroxy-2,5-dimethyl-2,3-dihydrothiophen- 3-one 4 with diaminomaleonitrile. The molecular structure of compound 5 has been confirmed by X-ray diffraction. A partial separation of charge causes a donor-acceptor type arrangement of the planar molecules in uniform parallel stacks with an interplanar spacing of 3.3342 Å at 100 K. View Full-Text

Keywords: Thieno3; 4-bpyrazine; o-quinonoid heterocycles; pyrazine-dicarbonitrile;di1-bromoethylpyrazine; crystal structure. Thieno3; 4-bpyrazine; o-quinonoid heterocycles; pyrazine-dicarbonitrile;di1-bromoethylpyrazine; crystal structure.





Autor: Eva H. Mørkved 1,* , Jon A. Beukes 2 and Frode Mo 2,*

Fuente: http://mdpi.com/



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