Dimethyl and diethyl esters of 5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carb-oxy-lic acid: a comparison

• Published in: Acta crystallographica. Section E, Crystallographic communications Vol. 72; no. Pt 2; pp. 233 - 237
• Main Authors: Alfonso, Montserrat, Stoeckli-Evans, Helen
• Format: Journal Article
• Language: English
• Published: England International Union of Crystallography 01.02.2016
• Subjects: Research Communications; pyrazine; di­carb­oxy­lic acid; dimeth­yl; crystal structure; pyridine; dieth­yl; C—H⋯O and C—H⋯N hydrogen bonding

In dimethyl 5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ate, C18H14N4O4, (I), and diethyl 5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ate, C20H18N4O4, (II), the dimethyl and diethyl esters of 5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carb-oxy-lic acid, the orientation of the two pyridine rings dif...