Zobrazeno 1 - 10
of 30
pro vyhledávání: '"V. Ph. Anufriev"'
Publikováno v:
Russian Chemical Bulletin. 65:993-1003
Under the drastic conditions of Zahn—Ochwat cycloacylation of 2-chloroand 2,3-dichlorohydroquinones with dichloromaleic anhydride (a melt of anhydrous AlCl3 and NaCl, 185—195 °C), the substrates undergo various degrees of disproportionation, whi
Autor:
V. Ph. Anufriev, Dmitry N. Pelageev, Vladimir A. Denisenko, D. V. Berdishev, M. A. Pushilin, V. P. Glasunov, Sergey V. Dragan
Publikováno v:
Russian Chemical Bulletin. 61:2102-2108
The resulting products of oxidative coupling of substituted 3-alkyl-2-hydroxynaphthazarins in the presence of lead dioxide are the compounds with 7,14-dibenzo[a,i]oxanthrene skeleton.
Publikováno v:
Russian Chemical Bulletin. 59:1781-1785
Reaction of 7-ethyl-2,3,6-trimethoxynaphthazarin with NH3·H2O proceeds at the carbonyl groups at the C(4) atoms of the 1,4-naphthoquinonoid tautomeric forms. Methoxy group adjacent to ethyl group is the orienting substituent in this reaction.
Autor:
V. Ph. Anufriev, Dmitry N. Pelageev
Publikováno v:
Russian Chemical Bulletin. 57:2335-2339
Hydroxy naphthazarins (2,5,8-trihydroxy-1,4-naphthoquinones) react with aromatic aldehydes containing no hydroxy groups at position 2 under mild acid catalysis to form 3,3′-(arylmethylene)bisnaphthazarins. On the example of o-vanillin, it was shown
Publikováno v:
Chemistry of Natural Compounds. 44:287-291
The cytotoxic activity of the principal intermediates and side products of echinochrome synthesis toward gametes of the sea urchin Strogylocentrotus intermedius was studied. Di-and trichloro naphthazarin derivatives with two vicinal Cl atoms were the
Autor:
Dmitrii V. Berdyshev, Vladimir A. Denisenko, A. Ya. Yakubovskaya, V. Ph. Anufriev, T. Yu. Kochergina, V. P. Glazunov
Publikováno v:
Russian Chemical Bulletin. 55:301-305
2,3-Dihydro-3-O-(1,4-naphthoquinon-2-yl)-2-oxo-1,4-naphthoquinones are the products of oxidative coupling of substituted 2-hydroxy-1,4-naphthoquinones (regardless of the presence of peri-hydroxy groups in their structures) under the action of lead di
Publikováno v:
Russian Chemical Bulletin. 53:2626-2633
Substituted 3-(alk-1-enyl)-2-hydroxynaphthazarins were synthesized. According to data from IR spectroscopy, these compounds exist in organic aprotic solvents as mixtures of tautomeric 1,4-naphthoquinonoid forms. The compositions of tautomeric mixture
Publikováno v:
Russian Chemical Bulletin. 52:2247-2250
The Friedel—Crafts acylation of trimethylhydroquinone, 3,5-diethyl-2-hydroxyhydroquinone, and 3,5-diethyl-1,2,4-trimethoxybenzene with dichloromaleic or citraconic anhydride in an AlCl3—NaCl melt is accompanied by o-C-dealkylation to afford funct
Publikováno v:
Russian Chemical Bulletin. 52:198-207
A series of substituted (poly)hydroxylated naphthazarins (5,8-dihydroxy-1,4-naphthoquinones) were synthesized. In general, (poly)hydroxynaphthazarins exist in organic aprotic solvents as mixtures of tautomeric 1,4-naphthoquinonoid forms (IR data). Th
Publikováno v:
Russian Chemical Bulletin. 52:1629-1632
It is found by IR spectroscopy that 1"-hydroxyalkylnaphthazarins in aprotic organic solvents exist as a mixture of the 1,4- and 1,5-naphthoquinonoid tautomers.