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Molbank, Volume 2016, Issue 3 (September 2016)

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Open AccessShort Note 1,4-Phenylenebis[(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-yl)methanone]
Molbank 2016, 2016(3), M902; doi:10.3390/M902
Received: 21 April 2016 / Revised: 22 June 2016 / Accepted: 23 June 2016 / Published: 28 June 2016
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Abstract
The compound named in the title was prepared from N1,N4-diphenethylterephthalamide 1. The resulting bis terephthalamide was subjected to an intramolecular α-amidoalkylation reaction with paraformaldehyde in the presence of heterogeneous catalyst TfOH/SiO2 to obtain 1,4-phenylenebis[(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H
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The compound named in the title was prepared from N1,N4-diphenethylterephthalamide 1. The resulting bis terephthalamide was subjected to an intramolecular α-amidoalkylation reaction with paraformaldehyde in the presence of heterogeneous catalyst TfOH/SiO2 to obtain 1,4-phenylenebis[(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-yl)methanone]. The structure of the newly synthesized compound was determined using 1H, 13C-NMR, UV, IR and mass spectral data. Full article
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Open AccessShort Note N-[(1E)-(3-Bromophenyl)methylene]-N-(2-piperidin-1-ylethyl)amine
Molbank 2016, 2016(3), M903; doi:10.3390/M903
Received: 27 May 2016 / Revised: 20 June 2016 / Accepted: 23 June 2016 / Published: 27 July 2016
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Abstract
N-[(1E)-(3-Bromophenyl)methylene]-N-(2-piperidin-1-ylethyl)amine Schiff base was prepared in good yield and characterized by the reflux of equivalent amounts of 2-(piperidin-1-yl)ethanamine with 3-bromobenzaldehyde. The structure of the desired Schiff base was analyzed based on: elemental analysis, EI-MS, TG/DTG, UV-visible, FT-IR, 1
[...] Read more.
N-[(1E)-(3-Bromophenyl)methylene]-N-(2-piperidin-1-ylethyl)amine Schiff base was prepared in good yield and characterized by the reflux of equivalent amounts of 2-(piperidin-1-yl)ethanamine with 3-bromobenzaldehyde. The structure of the desired Schiff base was analyzed based on: elemental analysis, EI-MS, TG/DTG, UV-visible, FT-IR, 1H and 13C-NMR spectral analysis. The condensation reaction was monitored by FT-IR. Full article
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Open AccessShort Note Octanoic Hydrazide-Linked Chitooligosaccharides-2,5-Anhydro-d-Mannofuranose
Molbank 2016, 2016(3), M904; doi:10.3390/M904
Received: 5 July 2016 / Revised: 18 July 2016 / Accepted: 25 July 2016 / Published: 16 August 2016
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Abstract
Chitooligosaccharide with one 2,5-anhydro-d-mannofuranose unit at the reducing end (COSamf) was prepared by nitrous acid depolymerization of chitosan. The reducing-end functionalization of COSamf by reductive amination with octanoic hydrazide in the presence of NaBH3CN was achieved in high yield.
[...] Read more.
Chitooligosaccharide with one 2,5-anhydro-d-mannofuranose unit at the reducing end (COSamf) was prepared by nitrous acid depolymerization of chitosan. The reducing-end functionalization of COSamf by reductive amination with octanoic hydrazide in the presence of NaBH3CN was achieved in high yield. The chemical structure of the targeted octanoic hydrazide-linked COSamf was fully characterized by NMR spectroscopy and MALDI-TOF mass spectrometry. This synthesis opens the way to a new generation of COSamf derivatives with potential amphiphilic properties. Full article
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Open AccessShort Note 1,3-Butanediol Dibenzoate
Molbank 2016, 2016(3), M905; doi:10.3390/M905
Received: 16 July 2016 / Revised: 5 August 2016 / Accepted: 12 August 2016 / Published: 17 August 2016
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Abstract
Environmentally friendly and straightforward methods for creating biofuels are required to promote biofuel use. Therefore, we present here a convenient and environmentally friendly direct self-aldol reaction of acetaldehyde in 100 mM borate buffer (pH 10) affording the dimer of 3-hydroxybutanal with a good
[...] Read more.
Environmentally friendly and straightforward methods for creating biofuels are required to promote biofuel use. Therefore, we present here a convenient and environmentally friendly direct self-aldol reaction of acetaldehyde in 100 mM borate buffer (pH 10) affording the dimer of 3-hydroxybutanal with a good yield. The product can be easily converted into 1,3-butanediol and its benzoate; therefore, our results will have a positive impact in the field of biochemical production from ethanol. Full article
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Open AccessShort Note 5,9,11-Trihydroxy-2,2-dimethyl-10-(3′-methyl-2′-butenyl)-3-(2″-methyl-3″-butenyl)pyrano[2,3-a]xanthen-12(2H)-one from the Stem Bark of Calophyllum pseudomole
Molbank 2016, 2016(3), M906; doi:10.3390/M906
Received: 7 July 2016 / Revised: 9 August 2016 / Accepted: 15 August 2016 / Published: 22 August 2016
Cited by 3 | PDF Full-text (866 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
5,9,11-Trihydroxy-2,2-dimethyl-10-(3′-methyl-2′-butenyl)-3-(2″-methyl-3″-butenyl)-pyrano[2,3-a]xanthen-12(2H)-one (1) was isolated from the stem bark of Calophyllum pseudomole. The structure of 1 was established by spectroscopic analysis which included UV, IR, HRESIMS and NMR experiments. Full article
(This article belongs to the Section Natural Products)
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Open AccessShort Note (E)-3-Methyl-6-(3-oxo-3-(3,4,5-trimethoxyphenyl)prop-1-en-1-yl)-2(3H)-benzothiazolone
Molbank 2016, 2016(3), M907; doi:10.3390/M907
Received: 20 June 2016 / Revised: 24 August 2016 / Accepted: 29 August 2016 / Published: 3 September 2016
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Abstract
The title compound, (E)-3-methyl-6-(3-oxo-3-(3,4,5-trimethoxyphenyl)prop-1-en-1-yl)-2(3H)-benzothiazolone, was synthesized by both an acid- and base-catalyzed aldol condensation of 3-methyl-6-acetyl-2(3H)-benzothiazolone and 3,4,5-trimethoxyacetophenone. The structure of the target compound was confirmed using 1H-NMR, 13C-NMR, IR, MS, and elemental analysis. Full article
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