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Molecules, Volume 2, Issue 2 (February 1997), Pages 31-56

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Research

Open AccessArticle 17O NMR of Enamino-Diesters: Intramolecular Hydrogen Bonding in 5-Alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones
Molecules 1997, 2(2), 31-35; doi:10.3390/feb97p1
Received: 20 December 1996 / Accepted: 17 January 1997 / Published: 25 February 1997
Cited by 4 | PDF Full-text (26 KB)
Abstract
Natural abundance 17O NMR spectra of a series of 5-alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones, recorded in acetonitrile solution, are reported. The δ(17O) values correlate well with those of 4-alkylaminobut-3-en-2-ones and with the pKa values of amines. The effects of the N-alkyl groups
[...] Read more.
Natural abundance 17O NMR spectra of a series of 5-alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones, recorded in acetonitrile solution, are reported. The δ(17O) values correlate well with those of 4-alkylaminobut-3-en-2-ones and with the pKa values of amines. The effects of the N-alkyl groups on the 17O shift values is diminished, owing to the resonance effects of the alkoxy groups. The shift difference (DδHB) between the two carbonyl groups is mainly attributed to the intramolecular hydrogen bonding and depends on the donor property of the amino group. Full article
Open AccessArticle New Anticandidous 2-Alkylthio-6-aminobenzothiazoles
Molecules 1997, 2(2), 36-42; doi:10.3390/feb97p2
Received: 19 October 1996 / Accepted: 26 November 1996 / Published: 25 February 1997
Cited by 11 | PDF Full-text (56 KB)
Abstract
The synthesis and antimicrobial activity of six new 2-alkenyl-6-aminobenzothiazoles are reported. The new compounds were prepared by alkenylation of the potassium salt of 6-amino-2-mercaptobenzothiazole with alkenyl bromides. The structure of the compounds was verified by 1H NMR spectra. The compounds have shown
[...] Read more.
The synthesis and antimicrobial activity of six new 2-alkenyl-6-aminobenzothiazoles are reported. The new compounds were prepared by alkenylation of the potassium salt of 6-amino-2-mercaptobenzothiazole with alkenyl bromides. The structure of the compounds was verified by 1H NMR spectra. The compounds have shown antibacterial activity against Staphylococcus aureus and anticandidous activity against Candida albicans. The optimum structure of the studied compounds has been calculated by quantum chemistry AM1 method. The theoretical values of lipophilicity were calculated for all alkenyl substituents. Full article
Open AccessCommunication Synthesis of 1,2,3,4,5,6-Hexahydrophosphinine 1-Oxides by Catalytic Hydrogenation of 3-Phosphabicyclo[3.1.0]hexane 3-Oxides
Molecules 1997, 2(2), 43-45; doi:10.3390/feb97p3
Received: 20 October 1996 / Accepted: 25 October 1996 / Published: 25 February 1997
PDF Full-text (15 KB)
Abstract Synthesis of 1,2,3,4,5,6-hexahydrophosphinine 1-oxides by catalytic hydrogenation of 3-phosphabicyclo[3.1.0]hexane 3-oxides was reported in this communication. Full article
Open AccessCommunication Synthesis of 1,2,3,6-Tetrahydrophosphinine 1-Oxides by Regioselective Reduction of 1,2-Dihydrophosphinine 1-Oxides
Molecules 1997, 2(2), 46-48; doi:10.3390/feb97p4
Received: 20 October 1996 / Accepted: 25 October 1996 / Published: 25 February 1997
Cited by 2 | PDF Full-text (15 KB)
Abstract Synthesis of 1,2,3,6-tetrahydrophosphinine 1-oxides by regioselective reduction of 1,2-dihydrophosphinine 1-oxides was reported in this communication. Full article
Open AccessArticle Synthesis and 1,3-Dipolar Cycloaddition Reactions of Chiral Maleimides
Molecules 1997, 2(2), 49-56; doi:10.3390/feb97p5
Received: 19 October 1996 / Accepted: 10 December 1996 / Published: 25 February 1997
Cited by 4 | PDF Full-text (42 KB)
Abstract
New routes to the synthesis of various novel chiral maleimides are described. The oxabicyclic anhydride 2 readily available exo-Diels-Alder adduct of furan and maleic anhydride was used as a vehicle, which in turn reacted with hydrochlorides of amino acids 3a-f in the presence
[...] Read more.
New routes to the synthesis of various novel chiral maleimides are described. The oxabicyclic anhydride 2 readily available exo-Diels-Alder adduct of furan and maleic anhydride was used as a vehicle, which in turn reacted with hydrochlorides of amino acids 3a-f in the presence of Et3N with release of furan to give the requisite novel chiral imides 4a-f in good to moderate yields. The stereoselectivity of 1,3-dipolar cycloaddition of nitrile oxides with prepared chiral imides 4a-f is investigated. Full article

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