- Bimolecular formation of radicals by hydrogen transfer. 14: The uncatalyzed transfer hydrogenation of α-methylstyrene by 2,6-disubstituted 9,10-dihydroanthracenes
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2,6-Dimethoxy- (4a), 2,6-bis(dimethylamino)- (4b), 2,6-dichloro- (4c) and 2,6-dimethoxycarbonyl-9,10-dihydroanthracene (4d) were prepared by conventional methods and used as hydrogen transfer donors to α-methylstyrene (5) between 290-350°C. The mechanism
- Keller, Friedrich,Ruechardt, Christoph
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scheme or table
p. 642 - 648
(2011/10/09)
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- Anthracene derivatives
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The present invention relates to compounds of formula (I) or a monomethyl or a monoethyl ether thereof (the compound of formula (I) including these ethers may contain no more than 30 carbon atoms in total); ethers, esters thereof; acid addition salts thereof; wherein Ar is an anthracene or substituted anthracene ring system; R1 contains not more than eight carbon carbon atoms and is a group STR1 wherein m is 0 or 1; R5 is hydrogen; R6 and R7 are the same or different and each is hydrogen or C1-3 alkyl optionally substituted by hydroxy; R8 and R9 are the same or different and each is hydrogen or C1-3 alkyl; --C--C-- is a five- or six-membered saturated carbocyclic ring; R10 is hydrogen, methyl or hydroxymethyl; R11, R12 and R13 are the same or different and each is hydrogen or methyl; R14 is hydrogen, methyl, hydroxy, or hydroxymethyl.
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- CORRELATED INTERNAL ROTATION IN BIS(2,6-DICHLORO-9-TRIPTYCYL)METHANE. TO WHAT EXTENT CAN PHASE ISOMERS BE SEPARATED AND IDENTIFIED?
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The title compound was separated by HPLC into the stereoisomers (one meso and four racemic compounds) due to the asymmetric bridgehead carbons and the correlated internal rotation.Optical resolution of the racemic compounds was performed by HPLC using a chiral support.
- Kawada, Yuzo,Okamoto, Yoshio,Iwamura, Hiizu
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p. 5359 - 5362
(2007/10/02)
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- Triazinyl dyes
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Vat dyestuffs of the formula EQU1 wherein R represents alkyl with 1 to 4 carbon atoms, R1 and R2 represent hydrogen or alkyl with 1 to 4 carbon atoms and each of A1 and A2 represents a vattable radical with 3 to 7 condensed rings are characterized by improved resistance to alkali and are suitable for dyeing and printing the most diverse materials, in particular fibers made from natural or regenerated cellulose.
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