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Displaying article 1-6
p. 574-587
Received: 10 November 2000; in revised form: 22 May 2001 / Accepted: 23 May 2001 / Published: 30 June 2001
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| Download PDF Full-text (226 KB) Abstract: 1,1-Disubstituted-3-(2-phenyl-3H -quinazolin-4-ylidene)thioureas (8) were synthesized in a one pot reaction of N -(2-cyanophenyl)benzimidoyl isothicyanate (3) with secondary amines. The products underwent transamination reactions. Compounds 8a-8g were identified by FTIR, 1 H-NMR, 13 C-NMR, mass spectroscopy and X-ray crystallography.
p. 588-602
Received: 10 November 2000; in revised form: 22 May 2001 / Accepted: 23 May 2001 / Published: 30 June 2001
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| Download PDF Full-text (202 KB) Abstract: 1-substituted-3-(2-phenylquinazolin-4-yl) thioureas (7) were produced by an intramolecular cycloaddition reaction of 1-substitued-3-[(2-cyanophenylimino) phenylmethyl] thioureas (3). These compounds in turn were prepared by the reaction of N-(2-cyanophenyl)benzimidoyl isothiocyanate (2) with primary amines. The structures of products 7 were confirmed by FTIR, 1 H-NMR, 13 C-NMR, mass spectroscopy and X-ray crystallography.
p. 603-613
Received: 16 February 2001; in revised form: 28 May 2001 / Accepted: 1 May 2001 / Published: 30 June 2001
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| Download PDF Full-text (135 KB) Abstract: Many compounds containing a -CONH- group display photosynthesis inhibiting activity. Based on this structural feature, a group of anilides of 2-alkylthio-(1b-4f) or 2-chloro-6-alkylthio-4-pyridinecarboxylic acids (5a-6c) was synthesised. The prepared compounds were tested for their inhibition of the oxygen evolution rate (OER) in spinach chloroplasts. A quasi-parabolic dependence between photosynthesis-inhibiting activity and the lipophilicity of the compounds was determined for 1b-4f as well as for 5a-6c. The inhibitory activity of compounds 1b-4f was higher than that of 5a-6c for comparable lipophilicity values.
p. 614-620
Received: 14 November 2000; in revised form: 24 May 2001 / Accepted: 1 June 2001 / Published: 30 June 2001
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| Download PDF Full-text (35 KB) Abstract: Nitrophenols can be obtained in moderate to high yields using a combination of Mg(HSO4 )2 or NaHSO4 .H2 O, NaNO3 and wet SiO2 in dichloromethane at room temperature.
p. 621-638
Received: 19 February 2001; in revised form: 4 June 2001 / Accepted: 7 June 2001 / Published: 30 June 2001
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| Download PDF Full-text (141 KB) Abstract: Novel 1-[6-(p -tolyl) pyridazin-3-yl]pyrazole-o-aminonitriles (3a-c) were formed using 3-hydrazino-6-(p -tolyl)pyridazine (2) and ketene S,S-acetals (1a), S,Nacetals (1b) or tetracyanoethylene (1c). The pyrazole-o-aminonitriles (3a-c) were in turn used as precursors for the preparation of previously unreported 1-[6-(p -tolyl)-pyridazin-3-yl]pyrazolo[3,4-d ]pyrimidines (8, 9, 13-20) and 7-[6-( p -tolyl) pyridazin-3-yl]2-arylpyrazolo[3,4-d ]1,2,4-triazolo[5,1-f]pyrimidines (10-12) which are expected to possess considerable chemical and pharmacological activities.
p. 639-646
Received: 15 November 2000; in revised form: 7 June 2001 / Accepted: 8 June 2001 / Published: 30 June 2001
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| Download PDF Full-text (71 KB) Abstract: The electrochemical oxidation of bromide in the presence of 1,3-indandione (1) in water/acetic acid and methanol/acetic acid mixtures has been studied by cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of 1,3-indandione in the bromination reaction. On the basis of the electroanalytical and preparative results a reaction mechanism including electron transfer, chemical reaction and regeneration of bromide was discussed. The electrochemical synthesis of bromo derivatives of 1,3-indandione (2-3) has been successfully performed at constant current, in an undivided cell, in good yield and purity.
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