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Título :	Conformerism, enantiomorphism and double catemer motifs in para-substituted nostoclide analogues.
Autor :	Teixeira, Róbson Ricardo Barbosa, Luiz Cláudio de Almeida Antolinez, Isabel Valero Correa, Rodrigo de Souza Martins, Felipe Terra Doriguetto, Antônio Carlos
Palabras clave :	Nostoclides Butenolides Gama-lactones Gama-alkylidenebutenolides Crystal structure
Fecha de publicación :	2016
Citación :	TEIXEIRA, R. R. et al. Conformerism, enantiomorphism and double catemer motifs in para-substituted nostoclide analogues. Journal of Molecular Structure, v. 1106, p. 291-299, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0022286015304014>. Acesso em: 26 set. 2016.
metadata.dc.description.abstracten:	We have here elucidated the crystal structures of five nostoclide analogues. A common feature in all compounds is a substituent at the para-position of the benzylidene group. Compounds with either bromine (3) or hydroxyl (4) as para-substituent crystallizes with Z’ ¼ 2 as result of conformerism. It was also observed that Z' > 1 in the compound with a para-dimethylamino substituent (1). However, its four crystallographically independent molecules are conformationally similar. They are not related by crystallographic symmetry due to the offset packing of their CeH … O]C nonclassical hydrogen bonded double chains. This compound (1) has also crystallized in a chiral space group (P21) despite the lack of a stereocenter. Such enantiomorphism phenomenon is related to the presence of only one of the two mirror benzyl conformations with phenyl ring at the equatorial position opposite the lactone oxygen atom. The molecular mean plane of nostoclide analogues has been featured by high level of planarity, except in the brominated compound where two twisted conformations occurred due to rotations on the single bond axis into benzylidene group. The benzyl conformation has been the greatest difference between the two crystallographically independent molecules of the para-hydroxylated compound (4). The crystal packing of the compounds is marked by double catemer motif assembled through CeH … O] C non-classical hydrogen bonds, although CeH … p interactions do play an important role in stabilizing the crystal packing of some compounds of the series.
URI :	http://www.repositorio.ufop.br/handle/123456789/7069
ISSN :	0022-2860
metadata.dc.rights.license:	O periódico Journal of Molecular Structure concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3958741415552.
Aparece en las colecciones:	DEQUI - Artigos publicados em periódicos

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