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Synthesis and structure elucidation of novel pyrazolyl-2-pyrazolines obtained b...
Santos, Clementina M.M.; Silva, Artur; Jeko, József; Lévai, AlbertNovel 3-aryl-5-{4-[5-(2-hydroxyphenyl)-1-phenylpyrazolyl]}-2-pyrazolines 2a-g have been prepared by the treatment of 3-(3-aryl-3-oxopropenyl)chromen-4-ones 1a-g with phenylhydrazine in refluxing acetic acid. NMR studies on deuteriochloroform solutions of pyrazolyl-2-pyrazolines 2a-g at different temperatures showed that at room temperature a mixture of diastereomers are present. This diastereoselectivity arises...
Dimethyldioxirane oxidation of exocyclic (E,E)-cinnamylideneketones
Lévai, Albert; Silva, Artur; Santos, Clementina M.M.; Cavaleiro, José; Jeko, Józsefhttp://apps.isiknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=11&SID=X22NMCKHdF5lcLIJG6o&page=1&doc=1&colname=WOS ; Exocyclic (E,E)-cinnamylideneketones were oxidized by an excess of isolated dimethyldioxirane (DMDO, in acetone solution) at room temperature, providing diastereomeric mixtures of the α,β:γ,δ-diepoxides. In the case of derivatives bearing an ortho-nitrocinnamylidene moiety,...
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