Month: December 2022

Vlassi, Anthi published the artcileWhat Socrates drank Comparative chemical investigation of two Greek Conium taxa exhibiting diverse chemical profiles, Related Products of esters-buliding-blocks, the main research area is Conium taxa chem profile investigation; Apiaceae; Artemia salina; Conium divaricatum; Conium maculatum; Essential oil; Isolation; Structure elucidation; Toxicity assessment.

Conium divaricatum, even though exhibiting morphol. differences in comparison to its congener of European origin Conium maculatum, is still considered a disputed taxon often referred to as a synonym of the latter. Herein, essential oils of various plant tissues from several populations of both taxa were comparatively investigated, showing distinct chem. profiles. In the case of C. divaricatum, the essential oils were dominated by hydrocarbon esters, among which the main constituents 4-oxodecyl hexanoate, 4-oxododecyl hexanoate and 4-oxooctyl hexanoate were isolated and identified as undescribed natural products. In contrast, the essential oils of C. maculatum were dominated by hydrocarbon alkanes, alkenes and ketones, as well as the polyacetylene (Z)-falcarinol. Even though determination of the total alkaloids content and toxicity assessment against the crustacean Artemia salina did not reveal significant differences, the distinct chem. profiles and the morphol. differences observed for both taxa, strongly support their distinction as sep. species.

Phytochemistry (Elsevier) published new progress about Alkanes Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Related Products of esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Vadola, Paul A. published the artcileC-H Bond Functionalization via Hydride Transfer: Formation of α-Arylated Piperidines and 1,2,3,4-Tetrahydroisoquinolines via Stereoselective Intramolecular Amination of Benzylic C-H Bonds, Name: Ethyl 2,2-dimethylpent-4-enoate, the main research area is arylated piperidine tetrahydroisoquinoline benzyl stereoselective intramol amination hydride transfer.

We here report a study of the intramol. amination of sp3 C-H bonds via the hydride transfer cyclization of N-tosylimines (HT-amination). In this transformation, 5-aryl aldehydes are subjected to N-toluenesulfonamide in the presence of BF3·OEt2 to effect imine formation and HT-cyclization, leading to 2-arylpiperidines and 3-aryl-1,2,3,4-tetrahydroisoquinolines in a one-pot procedure. We examined the reactivity of a range of aldehyde substrates as a function of their conformational flexibility. Substrates of higher conformational rigidity were more reactive, giving higher yields of the desired products. However, a single substituent on the alkyl chain linking the N-tosylimine and the benzylic sp3 C-H bonds was sufficient for HT-cyclization to occur. In addition, an examination of various arenes revealed that the electronic character of the hydridic C-H bonds dramatically affects the efficiency of the reaction. We also found that this transformation is highly stereoselective; 2-substituted aldehydes yield cis-2,5-disubstituted piperidines, while 3-substituted aldehydes afford trans-2,4-disubstituted piperidines. The stereoselectivity is a consequence of thermodn. control. The pseudoallylic strain between the arene and tosyl group on the piperidine ring is proposed to rationalize the greater stability of the isomer with the aryl ring in the axial position. This preferential placement of the arene is proposed to affect the observed stereoselectivity.

Journal of Organic Chemistry published new progress about Amination, stereoselective (intramol.). 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Name: Ethyl 2,2-dimethylpent-4-enoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Somkuwar, R. G. published the artcileVolatome finger printing of red wines made from grapes grown under tropical conditions of India using thermal-desorption gas chromatography-mass spectrometry (TD-GC/MS), HPLC of Formula: 539-88-8, the main research area is red wine grape volatile compound thermal desorption gas chromatog; Phenolics; Red wine varieties; TD–GC–MS; Volatile compounds; Wines.

The current study evaluated the key characters of aroma composition in diversified red wines (Cinsaut, Grenache, Cabernet Franc, Petit Verdot, Cabernet Sauvignon, Nielluccio, Tempranillo, Syrah, Merlot and Caladoc). Out of hundreds of volatile compounds 64 compounds were considered for study. Different groups consisting of fatty acids, volatile alcs., aldehydes, esters, volatile phenols and terpenes were analyzed using gas chromatog. mass spectrometry coupled with thermal desorption (TD-GC-MS). Among all these diversified classes, alcs. were found as the most dominant group followed by esters and acids whereas aldehydes, phenols and terpenes were found to be minor compounds Among the varieties, Nielluccio wine recorded highest concentration of total volatile compounds (191.53 mg/L) while, it was least in Caladoc wines (15.45 mg/L). The principal component anal. clearly differentiated Grenache wines based on their relationships between scores and their aroma composition followed by Nielluccio and Cinsuat wines. Out of sixty four compounds, only six aromatic compounds viz. butanediol, isoamyl actate, γ-Terpene, butanol, acetic acid and furfural have satisfying aroma descriptors with floral and fruity nuances and contribute to differentiate the Grenache wines from other varieties which have similar scores in PC1 anal. The cluster anal. also suggested that the wines in the same group (Cinsaut, Tempranillo and Syrah), (Cabernet Franc, Cabernet Sauvignon, Caladoc and Merlot) and (Nielluccio and Petit Verdot) had similar aroma characterization. Grenache wines were well differentiated from the sub group formed by other red varieties.

Journal of Food Science and Technology (New Delhi, India) published new progress about Esters Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, HPLC of Formula: 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Somkuwar, R. G. published the artcileVolatome finger printing of red wines made from grapes grown under tropical conditions of India using thermal-desorption gas chromatography-mass spectrometry (TD-GC/MS), Application In Synthesis of 106-32-1, the main research area is red wine grape volatile compound thermal desorption gas chromatog; Phenolics; Red wine varieties; TD–GC–MS; Volatile compounds; Wines.

The current study evaluated the key characters of aroma composition in diversified red wines (Cinsaut, Grenache, Cabernet Franc, Petit Verdot, Cabernet Sauvignon, Nielluccio, Tempranillo, Syrah, Merlot and Caladoc). Out of hundreds of volatile compounds 64 compounds were considered for study. Different groups consisting of fatty acids, volatile alcs., aldehydes, esters, volatile phenols and terpenes were analyzed using gas chromatog. mass spectrometry coupled with thermal desorption (TD-GC-MS). Among all these diversified classes, alcs. were found as the most dominant group followed by esters and acids whereas aldehydes, phenols and terpenes were found to be minor compounds Among the varieties, Nielluccio wine recorded highest concentration of total volatile compounds (191.53 mg/L) while, it was least in Caladoc wines (15.45 mg/L). The principal component anal. clearly differentiated Grenache wines based on their relationships between scores and their aroma composition followed by Nielluccio and Cinsuat wines. Out of sixty four compounds, only six aromatic compounds viz. butanediol, isoamyl actate, γ-Terpene, butanol, acetic acid and furfural have satisfying aroma descriptors with floral and fruity nuances and contribute to differentiate the Grenache wines from other varieties which have similar scores in PC1 anal. The cluster anal. also suggested that the wines in the same group (Cinsaut, Tempranillo and Syrah), (Cabernet Franc, Cabernet Sauvignon, Caladoc and Merlot) and (Nielluccio and Petit Verdot) had similar aroma characterization. Grenache wines were well differentiated from the sub group formed by other red varieties.

Journal of Food Science and Technology (New Delhi, India) published new progress about Esters Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Application In Synthesis of 106-32-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Oforma, C. C. published the artcileCharacterization of essential oils and fatty acids composition of stored Ginger (Zingiber officinale Roscoe), Safety of Methyl decanoate, the main research area is Zingiber essential oil fatty acid zingiberene GCMS.

The essential oils and fatty acids composition of stored Zingiber officinale Roscoe (Ginger) were characterized using Gas chromatog.-Mass Spectrometric (GC/MS) method. The ginger rhizomes sample was procured from spices store at Bwari main market, Abuja, Nigeria. It was pretreated and the proximate anal. was carried out. The essential oils and fatty acids were extracted using Hydro-distillation unit. It was then analyzed using GC/MS. From the results obtained, the proximate composition showed 8.50% protein content, 3.80% crude fiber, 5.10% fat, 3.60% ash content, 10.20% moisture and 68.80% carbohydrate content. 38 essential oil components were found and the essential oil was dominated by the compound class Sesquiterpenes (64.83%) followed by Esters (13.29%), aldehydes (9.16%), Sesquiterpenols (6.46%) and monoterpenes (5.71%). Monoterpenols constituted 3.35% while ketones and oxides were seen in trace amounts The specific dominant constituents were zingiberene (28.57%), Arcurcumene (14.22%) and Geranyl Acetate (13.28%). There was a decrease in the number of sesquiterpenes and monoterpenes in the stored ginger compared to the number earlier reported on freshly harvested and dried samples but the reduction did not affect the overall average percentage composition The fatty acid comprised 50% saturated acids and 50% unsaturated acids and was dominated by Linoleic Acid (23.92%) followed by palmitic acid (22.18%), oleic acid (20.40%) and Lauric Acid (8.34%). The composition of the Zingiber officinale essential oil and fatty acid has shown that the plant contains true essential oils, implying that the medicinal and flavouring strength of the plants may be attributed to its essential oil composition

Journal of Applied Sciences and Environmental Management published new progress about Blood. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Safety of Methyl decanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Oforma, C. C. published the artcileCharacterization of essential oils and fatty acids composition of stored Ginger (Zingiber officinale Roscoe), Synthetic Route of 929-77-1, the main research area is Zingiber essential oil fatty acid zingiberene GCMS.

The essential oils and fatty acids composition of stored Zingiber officinale Roscoe (Ginger) were characterized using Gas chromatog.-Mass Spectrometric (GC/MS) method. The ginger rhizomes sample was procured from spices store at Bwari main market, Abuja, Nigeria. It was pretreated and the proximate anal. was carried out. The essential oils and fatty acids were extracted using Hydro-distillation unit. It was then analyzed using GC/MS. From the results obtained, the proximate composition showed 8.50% protein content, 3.80% crude fiber, 5.10% fat, 3.60% ash content, 10.20% moisture and 68.80% carbohydrate content. 38 essential oil components were found and the essential oil was dominated by the compound class Sesquiterpenes (64.83%) followed by Esters (13.29%), aldehydes (9.16%), Sesquiterpenols (6.46%) and monoterpenes (5.71%). Monoterpenols constituted 3.35% while ketones and oxides were seen in trace amounts The specific dominant constituents were zingiberene (28.57%), Arcurcumene (14.22%) and Geranyl Acetate (13.28%). There was a decrease in the number of sesquiterpenes and monoterpenes in the stored ginger compared to the number earlier reported on freshly harvested and dried samples but the reduction did not affect the overall average percentage composition The fatty acid comprised 50% saturated acids and 50% unsaturated acids and was dominated by Linoleic Acid (23.92%) followed by palmitic acid (22.18%), oleic acid (20.40%) and Lauric Acid (8.34%). The composition of the Zingiber officinale essential oil and fatty acid has shown that the plant contains true essential oils, implying that the medicinal and flavouring strength of the plants may be attributed to its essential oil composition

Journal of Applied Sciences and Environmental Management published new progress about Blood. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Synthetic Route of 929-77-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Oforma, C. C. published the artcileCharacterization of essential oils and fatty acids composition of stored Ginger (Zingiber officinale Roscoe), Safety of Methyl octanoate, the main research area is Zingiber essential oil fatty acid zingiberene GCMS.

The essential oils and fatty acids composition of stored Zingiber officinale Roscoe (Ginger) were characterized using Gas chromatog.-Mass Spectrometric (GC/MS) method. The ginger rhizomes sample was procured from spices store at Bwari main market, Abuja, Nigeria. It was pretreated and the proximate anal. was carried out. The essential oils and fatty acids were extracted using Hydro-distillation unit. It was then analyzed using GC/MS. From the results obtained, the proximate composition showed 8.50% protein content, 3.80% crude fiber, 5.10% fat, 3.60% ash content, 10.20% moisture and 68.80% carbohydrate content. 38 essential oil components were found and the essential oil was dominated by the compound class Sesquiterpenes (64.83%) followed by Esters (13.29%), aldehydes (9.16%), Sesquiterpenols (6.46%) and monoterpenes (5.71%). Monoterpenols constituted 3.35% while ketones and oxides were seen in trace amounts The specific dominant constituents were zingiberene (28.57%), Arcurcumene (14.22%) and Geranyl Acetate (13.28%). There was a decrease in the number of sesquiterpenes and monoterpenes in the stored ginger compared to the number earlier reported on freshly harvested and dried samples but the reduction did not affect the overall average percentage composition The fatty acid comprised 50% saturated acids and 50% unsaturated acids and was dominated by Linoleic Acid (23.92%) followed by palmitic acid (22.18%), oleic acid (20.40%) and Lauric Acid (8.34%). The composition of the Zingiber officinale essential oil and fatty acid has shown that the plant contains true essential oils, implying that the medicinal and flavouring strength of the plants may be attributed to its essential oil composition

Journal of Applied Sciences and Environmental Management published new progress about Blood. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Safety of Methyl octanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Frank, Damian published the artcileVolatile and non-volatile metabolite changes in 140-day stored vacuum packaged chilled beef and potential shelf life markers, Category: esters-buliding-blocks, the main research area is volatile nonvolatile metabolite vacuum package chill beef; Beef; Metabolites; Odor; PTR-MS; Vacuum packaging; Volatiles.

During storage of vacuum packaged chilled beef (VPCB), lactic acid bacteria become the dominant microflora, facilitating an extended shelf life. However, at some point, (bio)chem. and organoleptic changes render the meat unacceptable. In this investigation we evaluated volatile and non-volatile metabolite changes in VPCB after 84-, 98-, 120- and 140-days storage at ∼ – 1°C. After 140-days storage, the sensory, volatile and non-volatile data did not indicate spoilage. Minimal changes in volatile signatures of collected weep and on raw and grilled steaks were measured. Changes in selected non-volatile components indicated increased proteolysis (free amino acids, carnosine) and changes in organic acids (lactic, succinic) and nucleotide metabolism Rapid volatile profiling using proton transfer reaction mass spectrometry showed a clear progression of changes in selected compounds over the storage period. An increased concentration of ethanol and other compounds between 120 and 140 days, suggested that volatile changes may be a useful objective indicator of extended storage VPCB quality.

Meat Science published new progress about Alkanes Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Rubial, Belen published the artcileSilylium-Catalyzed Alkynylation and Etherification Reactions of Benzylic Acetates, Recommanded Product: Benzyl acetate, the main research area is propargyl arene benzyl alkyl ether preparation; benzyl acetate trimethylalkynylsilane alkynation bistriflimide catalyst; trimethylalkoxysilane benzyl acetate etherification bistriflimide catalyst.

Addition of catalytic amounts of bistriflimide triggers useful coupling reactions of acetates e.g., 1-phenylethyl acetate with trimethyl(alkynyl)silanes e.g., (phenylacetylenyl)trimethylsilane and trimethyl(alkoxy)silanes e.g., trimethyl(2-phenylethoxy)silane to afford propargyl arenes e.g., 1,3-diphenylbut-1-yne and benzyl alkyl ethers e.g., [1-(2-phenylethoxy)ethyl]benzene resp. The added acid assists the release of reactive trimethylsilylium ion into the reaction media, which were found to act as the ultimate catalytic species responsible for the C-C and the C-O forming steps. The cationic nature of these coupling processes is documented.

European Journal of Organic Chemistry published new progress about Alkoxysilanes Role: RCT (Reactant), RACT (Reactant or Reagent). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ceccoli, Romina D. published the artcileGenome mining reveals new bacterial type I Baeyer-Villiger monooxygenases with (bio)synthetic potential, Application In Synthesis of 140-11-4, the main research area is genome mining type I Baeyer Villiger monooxygenase Bradyrhizobium; ketone oxidation lactone production Baeyer Villiger monooxygenase Bradyrhizobium.

Baeyer-Villiger monooxygenases (BVMOs) are oxidoreductases that catalyze the oxidation of ketones in a very selective manner. By genome mining we detected seven putative type I BVMOs in Bradyrhizobium diazoefficiens USDA 110. As we established the phylogenetic relationships among them and with other type I BVMOs, we found out that they belong to different clades of the phylogenetic tree. Thus, we decided to clone and heterologously express five of them. Three of them, each one from a divergent phylogenetic group, were obtained as soluble proteins, allowing us to proceed with their biocatalytic assessment and enzymic characterization. As to substrate scope and selectivity, we observed a complementary behavior among the three BVMOs. BVMO2 was the more versatile biocatalyst in whole-cell systems while BVMO4 and BVMO5 showed a narrow substrate profile with preference for linear ketones and particular regioselectivity for (±)-cis-bicyclo[3.2.0]hept-2-en-6-one.

Molecular Catalysis published new progress about Baeyer-Villiger oxidation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application In Synthesis of 140-11-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics