The title compound, C(26)H(18)BrNO(4), features a functionalized chromene. The cyclo-hexene ring adopts a sofa conformation and has the nitro group and the bromo-phenyl ring in an axial position. The ten atoms of the chromene moiety lie close to a common plane (r.m.s. deviation = 0.066 Å). The attached phenyl ring is twisted by 32.89 (10)° from the chromene plane. The crystal packing is stabili...

Luciana Morais Canavieiraa, Edikarlos Macedo Brasilb , Thiago de Melo e Silvac, Rosivaldo dos Santos Borgesd José Rogério Araújo Silvac* Jerônimo Lameiraac Paul V. Bernhardte, Craig M. Williamse & Cláudio Nahum Alvesc* a Programa Pós-Graduação em Biotecnologia, Instituto Ciências Biológicas, Universidade Federal do Pará, Belém, Brazilb Peptide Science Laboratory, School of Chemistry and Physics...

The ionic liquid Li(OHCH2CH2NH2)(CF3OAC) was found to efficiently catalyze the three-component reaction between different enols, aldehydes, and malononitrile , leading to rapid synthesis of 2-amino-4H-chromene derivatives in fairly high yields. The catalyst is easily prepared, highly stable, simple to handle and recycled for several times without significant loss of activity. The method is simp...

Sucrose is applied as an efficient catalyst for the three-component reaction consisting of aromatic aldehydes, malononitrile and resorcinol in a mixture of water and ethanol media as green solvents. The advantages of this method are excellent yeild, inexpensive catalyst and more environmentally friendly. Mechanistic insight into the synthesis of 2-amino-4H-chromene included spectral kinetics ap...

The title compound, C(26)H(18)Cl(2)O, is a heterocyclic structure consisting of a benzo[f]chromene ring and two aromatic rings. The non-H atoms of the benzo[f]chromene ring are almost coplanar (rms deviation = 0.107 Å), and the methyl C atom lies 1.340 (4) Å from the mean plane of the benzo[f]chromene ring. The chromene ring forms dihedral angles of 88.45 (2)° with the benzene ring linked to th...

For the first time, proton complexes of photoinduced colored form chromene have been obtained in polymer binders. It is shown that UV irradiation photochromic leads to spectral changes due structure compounds and nature binder. Keywords: photochromism, chromene, naphthopyran, matrix, spectroscopy.