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Compounds, Volume 1, Issue 2 (September 2021) – 3 articles

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11 pages, 1577 KiB  
Article
Volatile Organic Compounds from Orchis Species Found in Basilicata (Southern Italy)
by Marisabel Mecca, Rocco Racioppi, Vito A. Romano, Licia Viggiani, Richard Lorenz and Maurizio D’Auria
Compounds 2021, 1(2), 83-93; https://doi.org/10.3390/compounds1020008 - 02 Sep 2021
Cited by 10 | Viewed by 3367
Abstract
This study is part of a project devoted to determining the scent of all the orchid species present in Basilicata. All the analyses were performed by using the solid-phase microextraction technique coupled with gas chromatography-mass spectrometry. The scent of eight species belonging to [...] Read more.
This study is part of a project devoted to determining the scent of all the orchid species present in Basilicata. All the analyses were performed by using the solid-phase microextraction technique coupled with gas chromatography-mass spectrometry. The scent of eight species belonging to the Orchis genus was investigated. In the case of O. anthropophora, caryophyllene, tetradecanal and hexadecanal were the main components of the aroma; in O. purpurea, 3,5-dimethoxytoluene and elemicin were found; in O. italica, caryophyllene and 4-(3-hydroxy-2-methoxyphenyl)butan-2-one were found; in O. pauciflora, linalool and 1,4-dimethoxybenzene were found; in O. mascula, linalool was found; in O. quadripunctata, penta- and heptadecane were found; in O. provincialis, β-farnesene and farnesal were found; and in O. pallens, curcumene was the main product. Full article
(This article belongs to the Special Issue Feature Papers in Compounds)
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8 pages, 18060 KiB  
Communication
Application of CO2-Assisted Polymer Compression to Polylactic Acid and the Relationship between Crystallinity and Plasticization
by Takafumi Aizawa
Compounds 2021, 1(2), 75-82; https://doi.org/10.3390/compounds1020007 - 04 Aug 2021
Cited by 1 | Viewed by 2484
Abstract
CO2-assisted polymer compression (CAPC) is an environmentally friendly processing method that uses CO2 to plasticize and crimp polymer fibers at room temperature, enabling low-energy processing within a short time. In this study, CAPC was applied to polylactic acid (PLA), a [...] Read more.
CO2-assisted polymer compression (CAPC) is an environmentally friendly processing method that uses CO2 to plasticize and crimp polymer fibers at room temperature, enabling low-energy processing within a short time. In this study, CAPC was applied to polylactic acid (PLA), a carbon-neutral polymer. To evaluate the relationships between CO2 plasticization and the crystallinity degree and plasticization of PLA, samples with different degrees of crystallinity were layered and simultaneously compressed to observe the most collapsed layer. The sample with lower crystallinity exhibited better crushing and higher plasticization than the crystallized samples. The PLA with high crystallinity developed cracks on the fiber surfaces with consequent loss of strength. Based on the results, CAPC is a potentially effective method for PLA with low crystallinity. Full article
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17 pages, 15674 KiB  
Article
Convenient Access to Functionalized Non-Symmetrical Atropisomeric 4,4′-Bipyridines
by Emmanuel Aubert, Emmanuel Wenger, Paola Peluso and Victor Mamane
Compounds 2021, 1(2), 58-74; https://doi.org/10.3390/compounds1020006 - 01 Jul 2021
Cited by 6 | Viewed by 2992
Abstract
Non-symmetrical chiral 4,4′-bipyridines have recently found interest in organocatalysis and medicinal chemistry. In this regard, the development of efficient methods for their synthesis is highly desirable. Herein, a series of non-symmetrical atropisomeric polyhalogenated 4,4′-bipyridines were prepared and further functionalized by using cross-coupling reactions. [...] Read more.
Non-symmetrical chiral 4,4′-bipyridines have recently found interest in organocatalysis and medicinal chemistry. In this regard, the development of efficient methods for their synthesis is highly desirable. Herein, a series of non-symmetrical atropisomeric polyhalogenated 4,4′-bipyridines were prepared and further functionalized by using cross-coupling reactions. The desymmetrization step is based on the N-oxidation of one of the two pyridine rings of the 4,4′-bipyridine skeleton. The main advantage of this methodology is the possible post-functionalization of the pyridine N-oxide, allowing selective introduction of chlorine, bromine or cyano groups in 2- and 2′-postions of the chiral atropisomeric 4,4′-bipyridines. The crystal packing in the solid state of some newly prepared derivatives was analyzed and revealed the importance of halogen bonds in intermolecular interactions. Full article
(This article belongs to the Special Issue Feature Papers in Compounds)
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