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Molecules, Volume 6, Issue 7 (July 2001), Pages 574-646

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Research

Open AccessArticle One-Pot Quinazolin-4-ylidenethiourea Synthesis via N-(2-Cyanophenyl)benzimidoyl isothiocyanate
Molecules 2001, 6(7), 574-587; doi:10.3390/60700574
Received: 10 November 2000 / Revised: 22 May 2001 / Accepted: 23 May 2001 / Published: 30 June 2001
Cited by 11 | PDF Full-text (226 KB) | HTML Full-text | XML Full-text
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, 1H-NMR, 13C-NMR, mass spectroscopy and X-ray crystallography. Full article
Open AccessArticle One-Pot Quinazolin-4-yl-thiourea Synthesis via N-(2-Cyanophenyl) benzimidoyl isothiocyanate
Molecules 2001, 6(7), 588-602; doi:10.3390/60700588
Received: 10 November 2000 / Revised: 22 May 2001 / Accepted: 23 May 2001 / Published: 30 June 2001
Cited by 8 | PDF Full-text (202 KB) | HTML Full-text | XML Full-text
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, 1H-NMR, [...] Read more.
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, 1H-NMR, 13C-NMR, mass spectroscopy and X-ray crystallography. Full article
Open AccessArticle Some Anilides of 2-Alkylthio- and 2-Chloro-6-Alkylthio-4-Pyridinecarboxylic Acids: Synthesis and Photosynthesis-Inhibiting Activity
Molecules 2001, 6(7), 603-613; doi:10.3390/60700603
Received: 16 February 2001 / Revised: 28 May 2001 / Accepted: 1 May 2001 / Published: 30 June 2001
Cited by 2 | 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 [...] Read more.
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. Full article
Open AccessArticle Nitration Of Phenols Under Mild And Heterogeneous Conditions
Molecules 2001, 6(7), 614-620; doi:10.3390/60700614
Received: 14 November 2000 / Revised: 24 May 2001 / Accepted: 1 June 2001 / Published: 30 June 2001
Cited by 39 | PDF Full-text (35 KB) | HTML Full-text | XML Full-text
Abstract Nitrophenols can be obtained in moderate to high yields using a combination of Mg(HSO4)2 or NaHSO4.H2O, NaNO3 and wet SiO2 in dichloromethane at room temperature. Full article
Open AccessArticle Heterocyclic o-Aminonitriles: Preparation of Pyrazolo[3,4-d]-pyrimidines with Modification of the Substituents at the 1- Position
Molecules 2001, 6(7), 621-638; doi:10.3390/60700621
Received: 19 February 2001 / Revised: 4 June 2001 / Accepted: 7 June 2001 / Published: 30 June 2001
Cited by 18 | PDF Full-text (141 KB) | HTML Full-text | XML Full-text
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 [...] Read more.
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. Full article
Open AccessArticle Electrochemical Study of Bromide in the Presence of 1,3-Indandione. Application to the Electrochemical Synthesis of Bromo Derivatives of 1,3-Indandione
Molecules 2001, 6(7), 639-646; doi:10.3390/60700639
Received: 15 November 2000 / Revised: 7 June 2001 / Accepted: 8 June 2001 / Published: 30 June 2001
Cited by 11 | PDF Full-text (71 KB) | HTML Full-text | XML Full-text
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 [...] Read more.
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. Full article

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