Month: December 2022

Aszyk, Justyna published the artcileComprehensive determination of flavouring additives and nicotine in e-cigarette refill solutions. Part I: Liquid chromatography-tandem mass spectrometry analysis, Quality Control of 21834-92-4, the main research area is electronic cigarette flavoring additive nicotine determination; Electronic cigarettes; Flavouring compounds; Liquid chromatography; Nicotine; Tandem mass spectrometry.

Liquid chromatog.-tandem mass spectrometry with electrospray ionization (HPLC-ESI-MS/MS) methods were developed for the simultaneous determination of 42 flavouring compounds and nicotine in liquids for e-cigarettes. The chromatog. separation was performed using an Ace Ultracore SuperC18 (100 × 2.1 mm, 2.5 μm) column in both acidic and alk. pH conditions to sep. all the compounds A simple “”dilute & shoot”” approach was used for the sample preparation The method validation was performed by evaluating key anal. parameters such as linearity, accuracy, selectivity, precision, limit of detection (LOD) and limit of quantification (LOQ). The calibration curves showed good linearity within the specific ranges for the investigated compounds with correlation coefficients greater than 0.990 in each case. The recovery for all the investigated compounds varied from 89% to 110%. The intra- and inter-day precision were within the acceptable limits (± 15%) at all tested concentrations The applicability of the methods was examined by analyzing 25 liquid samples from e-cigarettes com. available on the Polish market.

Journal of Chromatography A published new progress about E-liquids. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Quality Control of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Cemin, Paloma published the artcileChocolates with Brazilian cocoa: Tracking volatile compounds according to consumers’ preference, Computed Properties of 21834-92-4, the main research area is phenethyl acetate phenyl methyl hexenal chocolates cocoa; Acceptance; Aroma; Cocoa liquor; Preference map; Sensory acceptance.

This study aimed to evaluate the volatile compounds of chocolates made of Brazilian cocoas and statistically track them according to the products sensorial profile in order to relate them to consumers’ acceptance by preference map methodol. The intensity of the chocolate, acidity, woody, smoked, green, floral, burned, musty, and cocoa notes from chocolates produced with cocoa from different Brazilian states were analyzed by a trained panel and by 128 consumers. Samples from Cote dIvoire, which is known for its high-quality chocolate, were evaluated for comparison. Solid-phase microextraction headspace sampling/gas chromatog.-mass spectrometry was employed to evaluate the samples volatile compounds One hundred volatile compounds were identified within the samples. The results from the preference maps showed that the maximum preference was found for chocolate made of cocoa from Rondonia, Bahia, and Espirito Santo and Cote dIvoire and organic samples from Para. The ideal sample point was characterized by intense chocolate, floral, and woody notes and mild green and burned notes. The presence of furfural, 3-Me butanal, phenethyl acetate, 2-phenyl-5-methyl-2-hexenal, Me pyrazine, phenethyl acetate, 2-phenyl-5-methyl-2-hexenal, and tetra-Me pyrazine were shown to be important for consumer acceptance in the ideal product, whereas the presence of (Z)-2-heptenal and 2-pentyl furan may increase consumer rejection. 2,3-Me pyrazine, Me pyrazine, and 2,3-butanediol, which are important volatile compounds previously reported in the literature, were statistically tracked to both pos. and neg. sample attributes and must be better explored concerning consumers acceptance of chocolates.

Food Research International published new progress about Chocolate. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Computed Properties of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Iio, Keita published the artcileDiscovery of orexin 2 receptor selective and dual orexin receptor agonists based on the tetralin structure: Switching of receptor selectivity by chirality on the tetralin ring, Safety of 4-Methoxyphenylacetic acid, the main research area is orexin 2 receptor agonists chirality structure activity; Agonist; Diarylsulfonamide; OX1R; OX2R; Orexin; Orexin receptor; Tetraline.

A novel series of 1-amino-tetralin derivatives were designed and synthesized based on the putative binding mode of the naphthalene-type orexin receptor agonist 5 and their agonist activities against orexin receptors were evaluated. The introduction of N-methyl-(3-methoxyphenyl)acetamide unit onto the 1-amino-tetralin skeleton remarkably enhanced the potency of the agonist. The asym. synthesis of 6 revealed that (-)-6 having a (S)-1-amino-tetralin skeleton showed a OX2R selective agonist activity (EC50 = 2.69 nM for OX2R, OX1R/OX2R = 461) yet its enantiomer (R)-(+)-6 showed a potent OX1/2R dual agonist activity (EC50 = 13.5 nM for OX1R, 0.579 nM for OX2R, OX1R/OX2R = 23.3). These results suggested that upward orientation of the amide side chain against the tetralin scaffold (S-configuration) would be selective for OX2R activation, and the downward orientation (R-configuration) would be significant for dual agonist activity. To our best knowledge, there have been no reports thus far that the stereochem. of one carbon center on the agonist structure regulates the orexin receptor selectivity. Our results would provide important information for the development of OX1R selective agonists.

Bioorganic & Medicinal Chemistry Letters published new progress about Chirality. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Safety of 4-Methoxyphenylacetic acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Van Nevel, S. published the artcilePalladium nanoparticles produced by fermentatively grown bacteria as catalyst for diatrizoate removal with biogenic hydrogen, Formula: C11H9I3N2O4, the main research area is Citrobacter Clostridium biogenic palladium nanoparticle formation.

This study demonstrated the general applicability of fermentatively grown bacteria (Clostridium butyricum and Citrobacter braakii) to generate catalytic Pd(0) nanoparticles and biol. produced hydrogen as electron donor. A process consisting of microbial hydrogen formation and Pd nanoparticle catalysis without the need for an external electron donor was studied in dehalogenation reactions in batch tests as well as in a membrane bioreactor (MBR) using diatrizoate as model compound The results of using biogenic Pd(0) for diatrizoate dehalogenation in batch experiments and for removal of diatrizoate in an MBR are presented.

Communications in Agricultural and Applied Biological Sciences published new progress about Catalysis. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Formula: C11H9I3N2O4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hennebel, Tom published the artcileDehalogenation of environmental pollutants in microbial electrolysis cells with biogenic palladium nanoparticles, Application In Synthesis of 117-96-4, the main research area is microbial electrolysis cell palladium trichloroethylene dechlorination catalytic groundwater remediation.

Purpose of work Hydrodehalogenation of persistent pollutants, such as the groundwater contaminants trichloroethylene and diatrizoate, are catalyzed by biogenic Pd nanoparticles. As H2 gas supply for the dehalogenation reactions is still the limiting factor, this study examines in situ H2 production in the cathode of a microbial electrolysis cell. In a biogenic Pd nanoparticle (bio-Pd) free microbial electrolysis cell (MEC), dechlorination of trichloroethylene (TCE) with concomitant chloride and ethane formation was achieved in the cathode compartment at a removal rate of 120 g TCE m-3 total cathode compartment (TCC) day-1, applying -0.8 V with a power source. When the cathode granules were coated with 5 mg bio-Pd g-1 graphite, chloride and ethane formation increased to 151 g TCE m-3 TCC day-1 corresponding with a specific removal rate of 48 mg TCE g-1 Pd day-1. In both cases, formation of unwanted byproducts, such as vinyl chloride, was not significant. When the same setup was applied for transformation of the iodinated contrast medium diatrizoate (diaI3), reduction in a catalyst-free cathode of a MEC resulted in a removal of 48 ± 9% during the first h corresponding to 3 g diaI3 m-3 TCC day-1. Coating the cathodic graphite granules with bio-Pd enhanced the transformation resulting in a 93 ± 4% removal during the first h corresponding to 6 g diaI3 m-3 TCC day-1. These results suggest that MECs can produce H2 in a sustainable way to provide an economical interesting reactant for bio-Pd catalyzed dehalogenation reactions.

Biotechnology Letters published new progress about Catalysis. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application In Synthesis of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Clemente-Villalba, Jesus published the artcileComparison on sensory profile, volatile composition and consumer’s acceptance for PDO or non-PDO tigernut (Cyperus esculentus L.) milk, Safety of 1,3-Dimethoxybenzene, the main research area is horchata tigernut milk volatile compound penalty analysis.

Cyperus esculentus tubers are the raw material to prepare tigernut milk (horchata), which can be marketed under Protected Designation of Origin “”C hufa de Valencia””. The aim of this study was to characterize com. tigernut milks and compare PDO and non-PDO products. The following aspects were studied: (i) volatile profile, (ii) descriptive sensory profile, (iii) consumer satisfaction degree. The key volatile compounds were limonene, benzaldehyde, linalool and m-methoxyanisole. Principal component anal. indicated a mix of PDO and non-PDO samples in the groups formed. The highest consumer satisfactions were observed for 2 PDO samples. Penalty anal. showed that 80% of non-PDO samples needed improvements, while this percentage drastically decreased to 40% for PDO samples. The online study proved that a lot of people drink horchata, less people know the PDO Chufa de Valencia and even less people consume the protected product consciously. In conclusion, there was not a clear difference among protected and non-protected tigernut milks respect to volatile compounds but there were differences in the degree of consumer preference. So, it is clear that a lack of knowledge regarding the product and its PDO exists and needs attention.

LWT–Food Science and Technology published new progress about Beverages. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Safety of 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Liu, Wen published the artcileIron-Catalyzed Enantioselective Radical Carboazidation and Diazidation of α,β-Unsaturated Carbonyl Compounds, Related Products of isoquinoline, the main research area is iron catalyzed enantioselective radical carboazidation diazidation alkene; azidation unsaturated carbonyl compound DFT calculation.

Azidation of alkenes is an efficient protocol to synthesize organic azides which are important structural motifs in organic synthesis. Enantioselective radical azidation, as a useful strategy to install a C-N3 bond, remains challenging due to the inherently instability and unique structure of radicals. Here, we disclose an efficient enantioselective radical carboazidation and diazidation of α,β-unsaturated ketones and amides catalyzed by chiral N,N’-dioxide/Fe(OTf)2 complexes. An array of substituted alkenes was transformed to the corresponding α-azido carbonyl derivatives in good to excellent enantioselectivities, benefiting the preparation of chiral α-amino ketones, vicinal amino alcs., and vicinal diamines. Control experiments and mechanistic studies proved the radical pathway in the reaction process. The DFT calculations showed that the azido transferred to the radical intermediate via an intramol. five-membered transition state with the internal nitrogen of the Fe-N3 species.

Journal of the American Chemical Society published new progress about Azidation. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Jatoth, Ramanna published the artcileMetal-Free TFA-Promoted Regioselective (Hetero)Arylation: Synthesis of (Hetero)Aryl Substituted and Carbazole/Oxepine Fused N-Heterocycles, COA of Formula: C8H10O2, the main research area is aryl substituted nitrogen heterocycle green preparation regioselective; nitrogen heterocycle arene arylation TFA promoted; carbazole fused nitrogen heterocycle green preparation regioselective; indole nitrogen heterocycle sequential heteroarylation hydroarylation TFA promoted; oxepine fused nitrogen heterocycle green preparation regioselective; indolyl phenol nitrogen heterocycle cascade heteroarylation arylation TFA promoted.

Metal-free TFA promoted arylation/heteroarylation was achieved under mild conditions via the reaction of chloro-derivatives of nitrogen heterocycles [e.g., =C-C(Cl)=N-] with electron rich arenes/heteroarenes for synthesis of aryl substituted nitrogen heterocycles such as I [R = H; R1 = H; RR1 = CH=CH-CH=CH; R2 = 1H-indol-3-yl, 2-hydroxy-1-naphthyl, 2,4-di-HOC6H3, etc.; R3 = Cl, CN; X = C, N]. It was also observed that apart from participating in the heteroarylation step, TFA was able to facilitate the hydroarylation/o-arylation process in the same pot affording the carbazole/oxepine fused N-heterocycles such as II [R4 = H, OMe, Br; R5 = H, Br; R6 = Ph, 4-MeC6H4; R7 = Me, Et, Bn] and III [R8 = H; R9 = H; R8R9 = CH=CH-CH=CH, CH=C(Me)-C(Me)=CH; R10 = H, Me; R11 = H, Me, Cl, Br]. The reaction proceeded with similar efficiency on gram scale.

Advanced Synthesis & Catalysis published new progress about Arylation. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, COA of Formula: C8H10O2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Kaur, Jaspreet published the artcilePhotocatalyst-Free, Visible-Light-Mediated C(sp3)-H Arylation of Amides via a Solvent-Caged EDA Complex, Safety of 1,3-Dimethoxybenzene, the main research area is arylation EDA complex.

A photocatalyst-free and mild visible light photochem. procedure for C(sp3)-H arylation of amides is described. The reaction proceeds via an electron donor-acceptor (EDA) complex between an electron-rich arene substrate and electron-poor persulfate oxidant. C(sp3)-H arylation of the amide occurs selectively with the most electron-rich arene of the substrate. Mechanistic studies corroborate the reaction taking place in a solvent cage holding components in a close proximity.

Organic Letters published new progress about Arylation. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Safety of 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Kobayashi, Daishiro published the artcilePeptide cyclization mediated by metal-free S-arylation: S-protected cysteine sulfoxide as an umpolung of the cysteine nucleophile, Application In Synthesis of 151-10-0, the main research area is cyclic stapled peptide synthesis; solid phase peptide synthesis oxidative cyclization cystein sulfoxide arylation; thioether linkage formation reaction mechanism sulfoxide tryptathionine; aromatic electrophilic substitution; S-arylation; peptide cyclization; stapling; sulfoxides; tryptathionine.

Covalent linking of side chains provides a method to produce cyclic or stapled peptides that are important in developing peptide-based drugs. A variety of crosslinking formats contribute to fixing the active conformer and prolonging its biol. activity under physiol. conditions. One format uses the cysteine thiol to participate in crosslinking through nucleophilic thiolate anions or thiyl radicals to form thioether and disulfide bonds. Removal of the S-protection from an S-protected Cys derivative generates the thiol, which functions as a nucleophile. S-Oxidation of a protected Cys allows the formation of a sulfoxide that operates as an umpolung electrophile. Herein, the applicability of S-p-methoxybenzyl Cys sulfoxide (Cys(MBzl)(O)) to the formation of a thioether linkage between tryptophan and Cys has been investigated. The reaction of peptides containing Cys(MBzl)(O) and Trp with trifluoromethanesulfonic acid (TFMSA) or methanesulfonic acid (MSA) in TFA in the presence of guanidine hydrochloride (Gn · HCl) proceeded to give cyclic or stapled peptides possessing the Cys-Trp thioether linkage. In this reaction, strong acids such as TFMSA or MSA are necessary to activate the sulfoxide. Addnl., Gn · HCl plays a critical role in producing an electrophilic Cys derivative that combines with the indole by aromatic electrophilic substitution. The findings led us to conclude that the less-electrophilic Cys(MBzl)(O) serves as an acid-activated umpolung of a Cys nucleophile and is useful for S-arylation-mediated peptide cyclization.

Chemistry – A European Journal published new progress about Arylation. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Application In Synthesis of 151-10-0.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem