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Molecules, Volume 6, Issue 6 (June 2001), Pages 496-573, Articles M211-M231

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Open AccessArticle Molecular Polarizability of Sc and C (Fullerene and Graphite) Clusters
Molecules 2001, 6(6), 496-509; doi:10.3390/60600496
Received: 8 March 2001 / Revised: 3 April 2001 / Accepted: 26 April 2001 / Published: 31 May 2001
Cited by 3 | PDF Full-text (65 KB) | HTML Full-text | XML Full-text
Open AccessArticle Reactions of 5-Aroylmethylene-3-benzyl-4-oxo-2-thioxo-1,3-thiazolidines with Nitrile Oxides
Molecules 2001, 6(6), 510-518; doi:10.3390/60600510
Received: 4 July 2000 / Revised: 13 January 2001 / Accepted: 30 April 2001 / Published: 31 May 2001
Cited by 7 | PDF Full-text (47 KB) | HTML Full-text | XML Full-text
Abstract
E,Z-5-Aroylmethylene-3-benzyl-4-oxo-2-thioxo-1,3-thiazolidines (3a-c) react with 4-methoxy and 4-chlorophenylnitrile oxides (4a and b) in pyridine solution to afford one or more of the following compounds: Z-3, Z-2,4-dioxo analogues 5 and 3,6-diaryl-1,4,2,5-dioxadiazines (6a-b). The interconversion route is discussed and the structures of all of the synthesised
[...] Read more.
E,Z-5-Aroylmethylene-3-benzyl-4-oxo-2-thioxo-1,3-thiazolidines (3a-c) react with 4-methoxy and 4-chlorophenylnitrile oxides (4a and b) in pyridine solution to afford one or more of the following compounds: Z-3, Z-2,4-dioxo analogues 5 and 3,6-diaryl-1,4,2,5-dioxadiazines (6a-b). The interconversion route is discussed and the structures of all of the synthesised compounds are proven by microanalytical and spectral data. Full article
Open AccessArticle Heteroaromatization with 4-Hydroxycoumarin Part II: Synthesis of Some New Pyrano[2,3-d]pyrimidines, [1,2,4]triazolo[1,5-c]pyrimidines and Pyrimido[1,6-b]-[1,2,4]triazine Derivatives
Molecules 2001, 6(6), 519-527; doi:10.3390/60600519
Received: 8 June 2000 / Revised: 16 September 2000 / Accepted: 15 February 2001 / Published: 31 May 2001
Cited by 78 | PDF Full-text (48 KB) | HTML Full-text | XML Full-text
Abstract A variety of novel [1,2,4]triazolo[1,5-c]pyrimidine-13-ones (4a-f) and (5b-d) could be obtained via reaction of 9-amino-7-(4’-chlorophenyl)-8,9-dihydro-8-imino-6H,7H-[1]benzopyrano[3`,4`:5,6]pyrano[2,3-d]pyrimidine-6-one (3) with a variety of reagents. Pyrano[2,3-d]pyrimidine-6-ones 5a, 8a-c and pyrimido[1,6-b][1,2,4]-triazine-3,14-dione (6) were also prepared. The antimicrobial activity of some of the synthesized compounds was tested. Full article
Open AccessArticle Synthesis of Bis (2,2,6,6-tetramethyl-4-piperidinyl) Maleate
Molecules 2001, 6(6), 528-532; doi:10.3390/60600528
Received: 22 August 2000 / Revised: 20 March 2001 / Accepted: 8 May 2001 / Published: 31 May 2001
Cited by 2 | PDF Full-text (47 KB) | HTML Full-text | XML Full-text
Abstract
Bis (2,2,6,6-tetramethyl-4-piperidinyl) maleate is a key intermediate for the synthesis of new types of hindered amine light stabilizers (HALS), so new synthetic routes to this compound are desirable. Through an orthogonal design and follow-up single factor experiments optimal reaction conditions were determined for
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Bis (2,2,6,6-tetramethyl-4-piperidinyl) maleate is a key intermediate for the synthesis of new types of hindered amine light stabilizers (HALS), so new synthetic routes to this compound are desirable. Through an orthogonal design and follow-up single factor experiments optimal reaction conditions were determined for synthesizing bis (2,2,6,6-tetramethyl-4-piperidiny) maleate using dimethyl maleate, 2,2,6,6-tetramethyl-4-piperidinol and zeolite supported tetraisopropyl titanate as catalyst. Under the selected conditions, the reaction rate and the yield are high, the selectivity is good, the catalyst can be recycled, and there are fewer wastes. The product was characterized and quantitatively analyzed by elemental analysis, mass spectrometry, infrared spectroscopy, nuclear magnetic resonance spectroscopy and ion suppression chromatography. Full article
Open AccessArticle Synthesis of 5-(4-X-Phenyl)-10,15,20-tris(Substituted Phenyl) Porphyrins Using Dipyrromethanes
Molecules 2001, 6(6), 533-539; doi:10.3390/60600533
Received: 27 November 2000 / Revised: 8 May 2001 / Accepted: 9 May 2001 / Published: 31 May 2001
Cited by 7 | PDF Full-text (37 KB) | HTML Full-text | XML Full-text
Abstract
5-(4-X-Phenyl)-10,15,20-tris(substituted phenyl) porphyrins (4-6) were synthesized from meso-(substituted phenyl) dipyrromethanes (1-3), which in turn were prepared in yields of 75-92 %. This synthetic pathway was compared with the binary mixed aldehyde and pyrrole condensation method. The reported dipyrromethane approach is advantageous for
[...] Read more.
5-(4-X-Phenyl)-10,15,20-tris(substituted phenyl) porphyrins (4-6) were synthesized from meso-(substituted phenyl) dipyrromethanes (1-3), which in turn were prepared in yields of 75-92 %. This synthetic pathway was compared with the binary mixed aldehyde and pyrrole condensation method. The reported dipyrromethane approach is advantageous for porphyrins substituted by –OCH3 (4) and -F (6) groups (12-14 %), while the yield of porphyrins bearing –N(CH3)2 (5) groups was similar (~0.3 %) by both methods. Full article
Open AccessArticle Alkylation of Zwitterionic Thiooxalic Acid Derivatives
Molecules 2001, 6(6), 540-550; doi:10.3390/60600540
Received: 12 March 2001 / Accepted: 10 May 2001 / Published: 31 May 2001
Cited by 1 | PDF Full-text (190 KB) | HTML Full-text | XML Full-text
Abstract
The new S-alkyl thiooxal-1-hydrazono-2-amidrazonium halides 2-4 were synthesized by reaction of the corresponding zwitterionic thiooxalic acid derivatives 1 with alkyl halides in methanol. The structures of compounds 4b and 4d were proven by X-ray structural analysis. Both compounds form an interesting intermolecular network
[...] Read more.
The new S-alkyl thiooxal-1-hydrazono-2-amidrazonium halides 2-4 were synthesized by reaction of the corresponding zwitterionic thiooxalic acid derivatives 1 with alkyl halides in methanol. The structures of compounds 4b and 4d were proven by X-ray structural analysis. Both compounds form an interesting intermolecular network of hydrogen bonds in the solid state. Full article
Open AccessArticle Photomediated Transformation of Salannin, a Tetranortriterpenoid from Azadirachta indica A. Juss
Molecules 2001, 6(6), 551-556; doi:10.3390/60600551
Received: 6 December 2000 / Revised: 11 May 2001 / Accepted: 14 May 2001 / Published: 31 May 2001
Cited by 4 | PDF Full-text (33 KB) | HTML Full-text | XML Full-text
Abstract
Photolysis of Salannin (1), an important bioactive compound from Azadirachta indica A.Juss (Neem), affords Δ17-isosalanninolide (2), a hitherto unknown compound, along with isosalanninolide (3) and salanninolide (4). A probable mechanism has been suggested. While the mechanism of formation of 2 involves
[...] Read more.
Photolysis of Salannin (1), an important bioactive compound from Azadirachta indica A.Juss (Neem), affords Δ17-isosalanninolide (2), a hitherto unknown compound, along with isosalanninolide (3) and salanninolide (4). A probable mechanism has been suggested. While the mechanism of formation of 2 involves both a [4+2] cycloaddition and a [1,3] sigmatropic shift in the furan and D-rings, respectively, formation of 3 and 4 involves the decomposition of an ozonoide-like peroxide intermediate. Full article
Open AccessArticle Regioselectivity of Electrophilic Attack on 4-Methyl-1-thioxo-1,2,4,5-tetrahydro[1,2,4]triazolo[4,3-a]quinazolin-5-one. Part 1: Reactions at the Sulfur Atom
Molecules 2001, 6(6), 557-573; doi:10.3390/60600557
Received: 16 July 2000 / Revised: 21 May 2001 / Accepted: 23 May 2001 / Published: 31 May 2001
Cited by 16 | PDF Full-text (180 KB) | HTML Full-text | XML Full-text
Abstract
The regioselectivity of the model compound 4-methyl-1-thioxo-1,2,4,5-tetrahydro[1,2,4]triazolo[4,3-a]quinazolin-5-one (3) towards different electrophiles was studied. Compound 3 reacts with alkyl and aryl halides to give the corresponding S-substituted derivatives. The reaction of the model thioamide with acyl halides proceeds by the formation of kinetically controlled
[...] Read more.
The regioselectivity of the model compound 4-methyl-1-thioxo-1,2,4,5-tetrahydro[1,2,4]triazolo[4,3-a]quinazolin-5-one (3) towards different electrophiles was studied. Compound 3 reacts with alkyl and aryl halides to give the corresponding S-substituted derivatives. The reaction of the model thioamide with acyl halides proceeds by the formation of kinetically controlled S-acyl derivatives followed by a transacylation reaction to give the N2-acyl derivatives as thermodynamically controlled products. Theoretical DFT computational studies supported the explanation of these results. The synthesized compounds were characterized by FTIR, 1H-NMR, 13C-NMR, and mass spectroscopy. Full article

Other

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Open AccessShort Note 2,4-Dimethyl-3-phenyl-[2'-methyl-3'-chloro]-7-chloro-8-methyl-1,3-diaza-2,4-diboranaphtalene Tricarbonylchromium Complexes
Molecules 2001, 6(6), M211; doi:10.3390/M211
Received: 15 December 2000 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (157 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 3-Cyano-2-(2,5-dimethoxybenzalamino)-4-5-tetramethylenethiophene
Molecules 2001, 6(6), M212; doi:10.3390/M212
Received: 18 December 2000 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (91 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 3-(2-Nitrophenyl)-2-(4-nitrophenyl)-4-thiazolidinone
Molecules 2001, 6(6), M213; doi:10.3390/M213
Received: 18 December 2000 / Accepted: 15 May 2001 / Published: 25 May 2001
Cited by 1 | PDF Full-text (91 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 2-Mercapto-5-(2'-isopropyl-5'-methylphenoxymethyl)-1,3,4-triazole
Molecules 2001, 6(6), M214; doi:10.3390/M214
Received: 18 December 2000 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (107 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (R,S)-N-[(2-Oxocyclohexyl)methyl]-1-butanaminium Chloride
Molecules 2001, 6(6), M215; doi:10.3390/M215
Received: 20 January 2000 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (113 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (R,S)-N-[(2-Oxocyclohexyl)methyl]-2-phenyl-1-ethanaminium Chloride
Molecules 2001, 6(6), M216; doi:10.3390/M216
Received: 20 January 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (115 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (+)-(1R)-N1-{[(1R,1S)-2-Oxocyclohexyl]methyl}-1-phenyl-1-ethanaminium Chloride
Molecules 2001, 6(6), M217; doi:10.3390/M217
Received: 20 January 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (119 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4-Morpholino-2-oxo-2H-chromene-3-carbaldehyde
Molecules 2001, 6(6), M218; doi:10.3390/M218
Received: 23 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (121 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 2-Bromo-3-ethylthiazolium Tetrafluoroborate (BET)
Molecules 2001, 6(6), M219; doi:10.3390/M219
Received: 20 January 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
Cited by 1 | PDF Full-text (105 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 1-Diazo-2-(2-quinolinyl)-2-ethanone
Molecules 2001, 6(6), M220; doi:10.3390/M220
Received: 20 January 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (114 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (1S,4R,5R,8R,9S,12R,13S) 12-(1S-Hydroxyethyl)-13-(3-hydroxypropyl)-5-(1,5-dimethylhexyl)-1,9-epoxy-4,8,13 Trimethyl Tricyclo [7,4,0,04,8] Tridecane
Molecules 2001, 6(6), M221; doi:10.3390/M221
Received: 19 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (123 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (1S,4R,5R,8R,9S,12R,13S),12-(1S-Hydroxyethyl)-13-(N-benzyl-2-carboxamido Ethyl)-5-(1,5-dimethylhexyl)-1,9-epoxy-4,8,13-trimethyl Tricyclo [7,4,0,0,4,8] Tridecane
Molecules 2001, 6(6), M222; doi:10.3390/M222
Received: 19 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (136 KB)
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 2-Formyl nor-31-lanosten-3-enol
Molecules 2001, 6(6), M223; doi:10.3390/M223
Received: 19 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (122 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 3-Trimethylsilanylethynyl-[1,10]phenanthroline
Molecules 2001, 6(6), M224; doi:10.3390/M224
Received: 21 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
Cited by 2 | PDF Full-text (118 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 3-Ethynyl-[1,10]phenanthroline
Molecules 2001, 6(6), M225; doi:10.3390/M225
Received: 21 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
Cited by 1 | PDF Full-text (111 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 3-(4-Iodo-phenylethynyl)-[1,10]phenanthroline
Molecules 2001, 6(6), M226; doi:10.3390/M226
Received: 21 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (121 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (1S,6S)-Tetrazolo [1,5-g]-7-Aza-trans-himachal-2-ene
Molecules 2001, 6(6), M227; doi:10.3390/M227
Received: 18 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (128 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (1S,2S,3R,6R,7R)-Epoxy-himachal-7-ol
Molecules 2001, 6(6), M228; doi:10.3390/M228
Received: 12 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (127 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4-Phenyl-2,2'-bis(phenylsulfonyl)butane
Molecules 2001, 6(6), M229; doi:10.3390/M229
Received: 16 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (185 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 2, 9-Diphenylamino-1,10-phenanthroline
Molecules 2001, 6(6), M230; doi:10.3390/M230
Received: 5 February 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (117 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note (3(5) Phenylpyrazol-5(3)-yl)-2-benzoylmethyl Benzimidazole
Molecules 2001, 6(6), M231; doi:10.3390/M231
Received: 12 January 2001 / Accepted: 15 May 2001 / Published: 25 May 2001
PDF Full-text (102 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)

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