o-Quinonoid compounds. Part II. 1,4-Diphenyl-2-benzopyran-3-one and its iron carbonyl complexes
作者:J. M. Holland、D. W. Jones
DOI:10.1039/j39700000530
日期:——
1,4-Diphenyl-2-benzopyran-3-one is prepared by dehydration–rearrangement of 1,3-dihydroxy-1,3-diphenyl-indian-2-one and by dehydration of o-benzoylphenyl(phenyl)acetic acid. The reactions of the pyrone and its conversion into related o-quinonoidcompounds are described. The interconvertible ironcarbonylcomplexes of the pyrone are prepared by reaction with dodecacarbonyltri-iron. The role of metal–ligand
Synthesis of Diindeno-Fused 4<i>H</i>-Cyclopenta[<i>def</i>]phenanthren-4-ones and Related Compounds via Benzannulated Enediynyl Propargylic Alcohols
作者:Xiaoqing Han、Yanzhong Zhang、Kung K. Wang
DOI:10.1021/jo047745y
日期:2005.3.1
Treatment of propargylic diols 5−7 with thionyl chloride promoted a cascade sequence of reactions leading to dichlorides 10−12 and, after reduction with tributyltin hydride, the diindeno-fused 4H-cyclopenta[def]phenanthrenes 13−15 in a single operation. Hydrolysis of 13 and 14 furnished 4H-cyclopenta[def]phenanthren-4-ones 16 and 17, respectively. Air oxidation of an alkaline solution of dichloride
1,4-Di-o-tolyl-2,3-naphthoquinone (1), produced by lead tetra-acetate oxidation of 1,4-di-o-tolylnaphthalene-2,3-diol (7) at –30 °C is sufficiently stable to allow purification involving aqueous work-up and low temperature chromatography; it has been characterised by u.v. and i.r. spectroscopy, as the adduct (8) formed with norbornadiene, and by a comparison of its properties with those of the stable
Die vorliegende Erfindung betrifft neue Methinfarbstoffe, Verfahren zu deren Herstellung und deren Verwendung zum Färben von Kunststoffen, insbesondere Polyamiden, wobei gelbe bis orange Färbungen mit verbesserten Lichtechtheiten und verbesserten Thermostabilitäten erhalten werden.
Selenium-promoted conversion of .beta.-diketones and .beta.-keto esters into .alpha.,.alpha.-dimethoxy .beta.-diketones and .alpha.,.alpha.-dimethoxy .beta.-keto esters