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Molbank, Volume 2021, Issue 2 (June 2021) – 5 articles

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Open AccessShort Note
4-(7-Bromobenzo[d][1,2,3]thiadiazol-4-yl)morpholine
Molbank 2021, 2021(2), M1202; https://doi.org/10.3390/M1202 - 13 Apr 2021
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Abstract
Dibromoderivatives of benzofused chalcogen-nitrogen heterocycles are important precursors in the synthesis of various photovoltaic materials. 4,7-Dibromobenzo[d][1,2,3]thiadiazole is a practically unexplored compound in this series. In this communication, it was shown that the nucleophilic substitution of 4,7-dibromobenzo[d][1,2,3]thiadiazole with morpholine gave [...] Read more.
Dibromoderivatives of benzofused chalcogen-nitrogen heterocycles are important precursors in the synthesis of various photovoltaic materials. 4,7-Dibromobenzo[d][1,2,3]thiadiazole is a practically unexplored compound in this series. In this communication, it was shown that the nucleophilic substitution of 4,7-dibromobenzo[d][1,2,3]thiadiazole with morpholine gave selectively 4-substituted product—4-(7-bromobenzo[d][1,2,3]thiadiazol-4-yl)morpholine. The structure of the newly synthesized compound was established by means of elemental analysis, high resolution mass-spectrometry, 1H, 13C NMR, and IR spectroscopy, mass-spectrometry, and X-ray analysis. Full article
(This article belongs to the Special Issue Heteroatom Rich Organic Heterocycles)
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Open AccessShort Note
Propyl Gallate
Molbank 2021, 2021(2), M1201; https://doi.org/10.3390/M1201 - 12 Apr 2021
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Abstract
The title compound, propyl gallate (III), is an important substance popularly used in the food, cosmetic and pharmaceutical industries. Current chemical syntheses of this compound are based on the acylation supported by thionyl chloride, DIC/DMAP or Fischer esterification using a range [...] Read more.
The title compound, propyl gallate (III), is an important substance popularly used in the food, cosmetic and pharmaceutical industries. Current chemical syntheses of this compound are based on the acylation supported by thionyl chloride, DIC/DMAP or Fischer esterification using a range of homogenous and heterogenous catalysts. In this paper, an efficient, green, straightforward, and economical method for synthesizing propyl gallate using potassium hydrogen sulfate, KHSO4, as the heterogenous acidic catalyst has been developed for the first time. In addition, this paper provides a comprehensive spectral dataset for the title compound, especially the new data on DEPT and 2D NMR (HSQC and HMBC) spectra which are not currently available in the literature. Full article
(This article belongs to the Section Organic Synthesis)
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Open AccessShort Note
Homopiperazine (Hexahydro-1,4-diazepine)
Molbank 2021, 2021(2), M1200; https://doi.org/10.3390/M1200 - 10 Apr 2021
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Abstract
The X-ray structure of the title compound has been determined for the first time. Data on its 1H–13C-NMR coupling constants and 15N-NMR spectrum are also given. Full article
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Open AccessShort Note
(1R,4S,5S)-5-((3-Hydroxypropyl)amino)-4-((1-methyl-1H-tetrazol-5-yl)thio)cyclopent-2-en-1-ol
Molbank 2021, 2021(2), M1199; https://doi.org/10.3390/M1199 - 01 Apr 2021
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Abstract
Using environmentally friendly conditions, the nucleophilic ring-opening reaction of 6-azabicyclo[3.1.0]hex-3-en-2-ol with 1-methyl-1H-tetrazole-5-thiol provided a novel thiol-incorporated aminocyclopentitol, (1R,4S,5S)-5-((3-hydroxypropyl)amino)-4-((1-methyl-1H-tetrazol-5-yl)thio)cyclopent-2-en-1-ol, in excellent yield (95%). The newly synthesized compound was analyzed and characterized via 1H, 13C-NMR, HSQC, and mass spectral data. Full article
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Open AccessShort Note
N-[(1R)-1-(4-Chlorophenyl)ethyl]-Cyanamide
Molbank 2021, 2021(2), M1198; https://doi.org/10.3390/M1198 - 26 Mar 2021
Viewed by 274
Abstract
The title compound was synthesized by electrophilic cyanation of commercially available (R)-4-chloro-α-methylbenzylamine with cyanogen bromide in diethyl ether, and isolated as a yellow oil in 84% yield. It was characterized by 1H and 13C{1H] NMR, IR, HRMS, and specific rotation measurements. Full article
(This article belongs to the Section Organic Synthesis)
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