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Search for "mechanical stress" in Full Text gives 9 result(s) in Beilstein Journal of Organic Chemistry.
Polymer and small molecule mechanochemistry: closer than ever
Beilstein J. Org. Chem. 2022, 18, 1225–1235, doi:10.3762/bjoc.18.128
- response to applied mechanical stress, and thus they could well be considered as force-reactive functional units (i.e., a new class of mechanophores) [52]. Interestingly, techniques based on ultrasound and ball milling have recently been used to activate piezoelectric materials, hinting at the similarities
Shift of the reaction equilibrium at high pressure in the continuous synthesis of neuraminic acid
Beilstein J. Org. Chem. 2022, 18, 567–579, doi:10.3762/bjoc.18.59
- well as the sample collection, and sample preparation for the analytics. For further analysis, long-term studies were carried out to analyze the stability in relation to different storage conditions such as the influence of moisture as well as temperature and mechanical stress. The stability of the
- time to 39 days or 58 days for the immobilized epimerase and aldolase, respectively, is observed when a continuous temperature exposure is applied. The mechanical stress of shaking the immobilized enzyme decreases the stability by about 20% compared to the reference study without shaking. From the
Multi-faceted reactivity of N-fluorobenzenesulfonimide (NFSI) under mechanochemical conditions: fluorination, fluorodemethylation, sulfonylation, and amidation reactions
Beilstein J. Org. Chem. 2022, 18, 182–189, doi:10.3762/bjoc.18.20
- stability under environments of mechanical stress, while at the same time enough reactivity to engage in chemical transformations. In the search for solid reagents compatible with mechanochemical techniques, we became interested in evaluating the behavior of N-fluorobenzenesulfonimide (NFSI) under ball
Dirhamnolipid ester – formation of reverse wormlike micelles in a binary (primerless) system
Beilstein J. Org. Chem. 2020, 16, 2820–2830, doi:10.3762/bjoc.16.232
- (G'' > G'). Fluids are unable to store mechanical stress. Thus, the storage modulus drops to almost zero. For the cooling process, the change of the moduli mirrors the ones of the heating process (Figure S1b in Supporting Information File 1). We performed concentration-dependent temperature sweeps
Synthesis of acylglycerol derivatives by mechanochemistry
Beilstein J. Org. Chem. 2019, 15, 811–817, doi:10.3762/bjoc.15.78
- peptides to endure mechanical stress in nature has allured scientists to evaluate the mechanical stability of proteins by using single-molecule nanomechanical techniques (e.g., magnetic and optical tweezers or atomic force microscopy) [3][4]. Additionally, the resilience of the peptide bond to mechanical
- molecules under environments of high mechanical stress. Specifically, the synthesis of mono- and diacylglycerols required first, the application of solventless functional group protection chemistry in ball mills, second, the implementation of metal-catalyzed epoxide-ring opening, and third, the development
Biocatalytic synthesis of the Green Note trans-2-hexenal in a continuous-flow microreactor
Beilstein J. Org. Chem. 2018, 14, 697–703, doi:10.3762/bjoc.14.58
- areas can be achieved via heterogeneous intake, by bubbling, stirring, etc. Soluble enzymes, however, are often rather unstable under these conditions, possibly owing to the mechanical stress leading to irreversible inactivation of the biocatalyst [7][8]. Methods of bubble-free aeration have been
Latest development in the synthesis of ursodeoxycholic acid (UDCA): a critical review
Beilstein J. Org. Chem. 2018, 14, 470–483, doi:10.3762/bjoc.14.33
- the half-life (23 h) is lower and the biocatalyst can be reused for only five cycles of conversions. In order to reduce the mechanical stress that might inactivate the immobilized enzymes, the flow-system represents a valid technology. The packed-bed reactor set up by Zheng et al. partially solved
Theoretical simulation of the infrared signature of mechanically stressed polymer solids
Beilstein J. Org. Chem. 2017, 13, 1710–1716, doi:10.3762/bjoc.13.165
- Matthew S. Sammon Milan Oncak Martin K. Beyer Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria 10.3762/bjoc.13.165 Abstract Mechanical stress leads to deformation of strands in polymer solids, including elongation of covalent bonds
- and widening of bond angles, which changes the infrared spectrum. Here, the infrared spectrum of solid polymer samples exposed to mechanical stress is simulated by density functional theory calculations. Mechanical stress is described with the external force explicitly included (EFEI) method. The
- infrared bands is not a shift of the peak position, but rather peak broadening and a characteristic change in the relative intensities of the strongest bands, which may serve for the identification and quantification of mechanical stress in polymer solids. Keywords: density functional theory; infrared
Poly(ethylene glycol)s as grinding additives in the mechanochemical preparation of highly functionalized 3,5-disubstituted hydantoins
Beilstein J. Org. Chem. 2017, 13, 19–25, doi:10.3762/bjoc.13.3
- to the solubility of reactants, reaction intermediates and final products in PEG polymers, although the existence of specific interactions with PEG polymers cannot be excluded. Indeed, especially under mechanical stress, PEGs are known to induce changes in the physical state of the system [8]. These
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