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Quinoxaline Mono- and

The infrared spectra of quinoxaline mono- and di-./V-oxides 3-quin-oxalinone 1-oxides, and 1-hydroxyquinoxaline 2,3-diones have been reported, and the ring stretching vibrations and C=0 and N—O stretching frequencies were assigned.267 2-Methyl-6-amino- and 2-methyl-6-nitro-l,2,3,4-tetrahydro-3-quinoxalinones have been examined... [Pg.429]

By the addition of 2- and 3-thienyl-lithium to quinoxaline, mono- and dithienyl-substituted quinoxalines have been prepared and their lithiation and self-addition further investigated. From 1,5-diketones containing thienyl and furyl substituents, pyrylium and thiopyrylium salts such as (212) have been prepared.N.m.r. spectra of compounds related to (212) have been investigated. 1,5-Diketones were also used for the synthesis of... [Pg.112]

Quinoxaline Mono- and Di-N-oxides from o-Benzoquinone Dioxime. . 38... [Pg.28]

The infrared spectra of quinoxaline mono- and di-AT-oxides show characteristic N—O stretching frequencies in the range of 1280-1380 cm The band usually appears in the range of 1320-1350 Isomers such as 26 and 27, produced by reaction of benzofuroxan with... [Pg.40]

The reaction has been apphed to a number of azaaromatic substrates, including pyrazine and quinoxaline mono- and di-iV-oxides. The latter are able to undergo the double substitution of hydrogen, thus enabling one to incorporate two radical species into the Sn products [148—150]. [Pg.28]

See other pages where Quinoxaline Mono- and is mentioned: [Pg.28]    [Pg.30]    [Pg.32]    [Pg.34]    [Pg.36]    [Pg.38]    [Pg.38]    [Pg.40]    [Pg.42]    [Pg.42]    [Pg.43]    [Pg.44]    [Pg.46]    [Pg.48]    [Pg.52]    [Pg.54]    [Pg.56]    [Pg.72]    [Pg.74]    [Pg.76]    [Pg.389]   


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