Crystal structures of 1,1′-di(2-propanone)-2,2′-biimidazole dihydrazone and 2,6-diacetylpyridine dihydrazone

Autor:	Paula M. Secondo, Harvest L. Collier, Russell G. Baughman
Rok vydání:	1997
Předmět:	chemistry.chemical_classification Nucleophilic addition Substituent Hydrazone General Chemistry Crystal structure Condensed Matter Physics chemistry.chemical_compound Crystallography chemistry Moiety Imidazole Orthorhombic crystal system Hydrate
Zdroj:	Journal of Chemical Crystallography. 27:371-375
ISSN:	1572-8854 1074-1542
DOI:	10.1007/bf02576571
Popis:	The nucleophilic addition reactions between 1,1′-di(2-propanone)-2,2′-biimidazole or 2,6-diacetylpyridine and hydrazine hydrate afford 1,1′-di(2-propanone)-2,2′-biimidazole dihydrazone (1) and 2,6-diacetylpyridine dihydrazone (2), respectively. Compound1 crystallizes in the orthorhombic space groupP212121, witha=9.042(2),b=9.731(3),c=15.683(4)A, V = 1379.9(6)Aℨ andZ=4. Compound2 crystallizes in the orthorhombic space groupPnma, witha=10.948(2),b=19.742(6),c=4.566(1)A, V=986.9(4)Aℨ andZ=8. A pseudo center of inversion is present at the midpoint of the C−C bond joining the imidazole rings of1, whose substituents crystallize in atrans configuration. The imidazole rings are rotated 2.5(3)° about the C−C bond. In contrast to the essentially planar structure of2, the hydrazone substituent groups of1 are at angles of 89.9(1)° and 88.4(1)° with respect to the plane of the adjacent imidazole moiety.
Databáze:	OpenAIRE
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