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Anthrone reaction preparation

Benzanthrone (6.73) is the source of various commercially important violet, blue and green vat dyes. This tetracyclic system can be prepared from a mixture of anthraquinone and propane-1,2,3-triol (glycerol) by heating with iron powder in concentrated sulphuric acid. The reaction involves reduction of anthraquinone to anthrone (6.74) followed by condensation (Scheme 6.14) with propenal (acrolein), the latter compound being generated... [Pg.301]

Anthraquinones. A new regioselective route to highly substituted anthraquinones (4) involves the reaction of diketene in the presence of sodium hydride with ethyl 4-uryl-3-oxobutanoates (1) prepared as shown from arylacetic acids. The products, after mcthylation, are cyclized to anthrones (3), which are oxidized to anthraquinones.1... [Pg.437]

Unfortunately anthrahydroquinone is not very stable under acid conditions, which are needed for a reversible cyclization of the benzoquinone derivatives. There is an early preparative observation on the rapid formation of anthraquinone (AQ) 3 and anthrone (Ant) 4 from anthrahydroquinone (AQH2) 1 in cold concentrated sulfuric acid [83] according the overall reaction... [Pg.331]

See other pages where Anthrone reaction preparation is mentioned: [Pg.228]    [Pg.311]    [Pg.208]    [Pg.34]    [Pg.268]    [Pg.492]    [Pg.258]    [Pg.611]    [Pg.3117]    [Pg.203]    [Pg.62]    [Pg.261]    [Pg.128]    [Pg.377]    [Pg.45]    [Pg.124]    [Pg.59]   
See also in sourсe #XX -- [ Pg.210 ]



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