Tag: M.W=150-200

Panda, Saroj K. published the artcileAlkyl carbon number limits the ring-number separation of polycyclic aromatic compounds in petroleum analysis, Recommanded Product: Dimethyl adipate, the publication is Fuel (2021), 118937, database is CAplus.

There have been many attempts to achieve a clear-cut separation of alkylated aromatic compounds based on the number of aromatic rings employing normal-phase liquid chromatog. However, each method has its own limitations to address this issue. Therefore, we aimed to elucidate the involved mechanisms for this limitation. For this purpose, stationary phases viz. amino- and cyano-bonded silica gel were considered. The phases were evaluated with the distilled cuts of a crude oil based on resolution and selectivity, and the optimum phase was selected for the separation of a crude oil. It was observed that there was a significant overlap of compounds with the same ring-number in different peaks. The cause of overlap was linked to the number of alkyl carbon atoms attached to the aromatic rings. Aromatic compounds substituted with higher number of alkyl carbon atoms (total) elute earlier than those with lower number of alkyl carbon atoms. This trend was maintained for hydrocarbons, sulfur-containing compounds (S1), and di-sulfur containing compounds (S2). It was further corroborated using mol. modeling calculations that (i) the increase in the number of alkyl carbon atoms increases the mol. volume, and (ii) the volume of the mols. remains similar irresp. of the number and position of alkyl substituents provided that the total number of alkyl carbon atoms remains the same. Finally, it was revealed that the counteractive role of the size exclusion mechanism limits the application of normal-phase chromatog. for a clear-cut separation of alkylated aromatic compounds according to the number of aromatic rings.

Fuel published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Recommanded Product: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ismaeel, Shams Aws published the artcileDetermination of trace metformin in pharmaceutical preparation using molecularly imprinted polymer based pvc-membrane, Recommanded Product: Dimethyl adipate, the publication is Eurasian Chemical Communications (2021), 3(11), 812-830, database is CAplus.

Polymerization of precipitation was used to make liquid electrodes with metformin (MET) imprinted polymers. Lev was used as a template to make mol. (MIP) and non-imprinted (NIP) polymers. In the polymerization process, Me methacrylate (MMA), acrylamide (AM), ethylene glycol dimethacrylate (EGDMA), and benzoyl peroxide (BPO) were employed as monomers, cross-linkers, and initiators. Using Di B Sabacat (DBS) and Di Me adipate (DMA) as plasticizers in PVC matrix, the molecularly imprinted membranes and the nonmembranes were prepared The liquid electrodes’ slopes and detection limits were -28.03 – -19.45 mV/decade and 3 x 10-5 M- 7 x 10-5 M, resp., and their reaction time was about 1 min. Liquid electrodes were filled with 0.1 M standard drug solution, and their response was consistent throughout a pH range of 1.5 to 10.0, with high selectivity for several types. The electrodes developed have been effectively used in the production of pharmaceutical samples for analyte anal. without the need for time-consuming pretreatment.

Eurasian Chemical Communications published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Recommanded Product: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Salamanca, Vanesa published the artcileDeuterium Exchange between Arenes and Deuterated Solvents in the Absence of a Transition Metal: Synthesis of D-Labeled Fluoroarenes, HPLC of Formula: 350-19-6, the publication is European Journal of Organic Chemistry (2020), 2020(22), 3206-3212, database is CAplus.

Fluoroarenes can be selectively deuterated by H/D exchange with common deuterated solvents in the presence of a catalytic amount of an alkali metal carbonate or, for the less acidic arenes, stoichiometric quantities of potassium phosphate. This is a sustainable method that does not need transition metal catalysis or the multistep synthesis of a main-group organometallics. This exchange needs to be taken into account when using H/D scrambling as a mechanistic probe in reactions involving fluoroarenes.

European Journal of Organic Chemistry published new progress about 350-19-6. 350-19-6 belongs to esters-buliding-blocks, auxiliary class Fluoride,Benzene,Ester, name is Ethyl 3,5-difluorobenzoate, and the molecular formula is C9H8F2O2, HPLC of Formula: 350-19-6.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Jebara, Amel published the artcilePhthalates and non-phthalate plasticizers in Tunisian marine samples: Occurrence, spatial distribution and seasonal variation, Name: Dimethyl adipate, the publication is Marine Pollution Bulletin (2021), 111967, database is CAplus and MEDLINE.

Seawater, sediment, seagrass and fish from several sites along the Tunisian coast were monitored for several phthalate esters (PAEs) and non-phthalate plasticizers (NPPs) during 2018-2019. In water and sediment, NPPs were higher than PAEs, being di(2-ethylhexyl) phthalate (DEHP, 0.0717 and 4.59μg/g), and di(2-ethylhexyl) terephthalate (DEHT, 0.634 and 2.42μg/g) most abundant. As expected, sediments acted as a sink for plasticizers, thus revealing a stronger contamination than water. Seagrass was less contaminated than fish, being DEHP (0.726 and 1.77μg/g) and DEHT (9.19 and 23.2μg/g) predominant. Biota poorly concductivity/accumulated plasticizers from water and sediment depending on the logKoct/wat and water solubility of single congeners. The spatial distribution of plasticizers was affected by the proximity to anthropogenic sources and the rate of coastal currents; whereas their seasonal variation may be related to the length of time of touristic/industrial inputs and factors such as rainfall and urban stormwater runoff.

Marine Pollution Bulletin published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Name: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Tawfeek, Mohamed E. published the artcilePotential insecticidal activity of four essential oils against the rice weevil, Sitophilus oryzae (L.) (coleoptera: curculionidae), COA of Formula: C8H14O4, the publication is BioResources (2021), 16(4), 7767-7783, database is CAplus.

Oils extracted from Cymbopogon citratus, Lantana camara, Artemisia camphorata, and Imperata cylindrica plants were used as potential insecticides against the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae). The phytochem. composition of the isolated oils was identified by gas chromatograph-mass spectrometry (GC-MS). Oil contact toxicities were evaluated against the adults of S. oryzae. The activities of acetylcholinesterase (AChE), alk. phosphatase (ALP), and transaminases enzymes (AST) were measured. L. camara oil (LC₅₀ = 9.81 mg/cm²) demonstrated the highest effect, followed by C. citratus oil (LC₅₀ = 10.89 mg/cm²), A. camphorata EO (LC₅₀ = 16.12 mg/cm²), and I. cylindrica oil (LC₅₀ = 36.85 mg/cm²) against the adults of S. oryzae. The inhibition percentages of AChE were 38.8, 41.7, 35.0, and 27.2%; ALP were 42.4, 49.3, 28.1, and 18.7%; AST were 33.9, 38.7, 20.8, and 11.8%; and ALT were 22.7, 30.5, 14.6, and 9.6% after treated S. oryzae with oils from C. citratus, L. camara, A. camphorata and I. cylindrica, resp. The highest abundant compounds in C. citratus were geranial (25.95%), nerylacetal (8.85%), and neral (8.45%), in L. camara were caryophyllene (12.2%), and 3-elemene (8.89%), in A. camphorata were germacrene D-4-ol (20.83%), and borneol (19.47%), and in I. cylindrica were 5-phenylundecane (10.68%), and 6-phenyldodecane (8.70%).

BioResources published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C9H13NO2, COA of Formula: C8H14O4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Beltifa, Asma published the artcileIdentification and quantification of plasticizers, bisphenol, and environmental toxic mineral elements residues in medicines from Tunisian markets, Recommanded Product: Dimethyl adipate, the publication is Environmental Science and Pollution Research (2021), 28(36), 50462-50470, database is CAplus and MEDLINE.

In this study, 18 plasticizer (phthalates, adipates, sebacates, and others) residues in sixteen medicines available in Tunisian pharmaceutical markets are evaluated by MSPD combined with GC-MS. In parallel, in this research, UPLC-MS/MS technique was performed to detect bisphenol A, and cadmium, lead, chromium, cobalt, nickel, mercury, selenium, and arsenic levels were determined by ICP-MS. The maximum daily ingested mass of mineral elements was calculated and compared with permissible daily exposure limits published by USP NF 2013. Our results demonstrated that the 50% of drugs contained similar concentrations of di-Et adipate. Di-iso-Bu phthalate was found in a single sample with a high concentration (1.07 mgkg-1). Di-methyladipate was also present in only one sample. Di-Et phthalate was detected in three medicines: the highest concentration (17.03 mgkg-1) was found in capsules. The other plasticizers and bisphenol A levels were below the limits of quantification in the all samples. All tested products were safe for use, except two clay-originated products. Concentrations and the maximum daily ingested mass of lead and arsenic were higher than recommended limits. The use of these medicines should require more attention taking into account the serious hazards of heavy metals to human health.

Environmental Science and Pollution Research published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Recommanded Product: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Sheta, Ahmed M. published the artcileSelective Electrosynthetic Hydrocarboxylation of α,β-Unsaturated Esters with Carbon Dioxide, Computed Properties of 103-26-4, the publication is Angewandte Chemie, International Edition (2021), 60(40), 21832-21837, database is CAplus and MEDLINE.

An electrochem. approach that is able to hydrocarboxylate α,β-unsaturated alkenes with excellent regioselectivity and ability to carboxylate hindered substrates to afford α-quaternary center carboxylic acids was reported. The process required no chromatog. and products were purified by simple crystallization from reaction mixture after work-up.

Angewandte Chemie, International Edition published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C13H10O2, Computed Properties of 103-26-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Bravo-Altamirano, Karla published the artcilePalladium-Catalyzed Reactions of Hypophosphorous Compounds with Allenes, Dienes, and Allylic Electrophiles: Methodology for the Synthesis of Allylic H-Phosphinates, Formula: C12H14O2, the publication is Journal of Organic Chemistry (2008), 73(6), 2292-2301, database is CAplus and MEDLINE.

Hypophosphorous compounds (MOP(O)H₂, M = H, R₃NH) effectively participate in metal-catalyzed C-P bond-forming reactions with allenes, dienes, and activated allylic electrophiles under mild conditions. The catalytic system Pd₂dba₃/xantphos is crucial to avoid or minimize the competitive reductive transfer-hydrogenation pathway available to hypophosphorous acid derivatives Further study into the allylation mechanism provided access to the analogy allylic acetate-allylic phosphinate, which then led to the development of a Pd-catalyzed rearrangement of preformed allylic phosphinates esters and, ultimately, to a catalytic dehydrative allylation of hypophosphorous acid with allylic alcs. The reactions disclosed herein constitute efficient synthetic approaches, not only to prepare allylic H-phosphinic acids but also their esters via one-pot tandem processes. The potential of H-phosphinates as useful synthons for the preparation of other organophosphorus compounds is demonstrated.

Journal of Organic Chemistry published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Formula: C12H14O2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Abraham, Michael H. published the artcileEstimation of vapor pressures of liquid and solid organic and organometallic compounds at 298.15 K, Name: 3-(Methoxycarbonyl)benzoic acid, the publication is Fluid Phase Equilibria (2020), 112595, database is CAplus.

Equations for vapor pressure VP, as log VP, at 298.15 K for a set of 1016 liquid organic and organometallic compounds have been constructed using Abraham descriptors. The regression standard deviations of 0.28 and 0.31 log units are excellent by comparison with literature values for large data sets. Similar equations for a set of 359 solid organic and organometallic compounds were very poor, but if carboxylic acids were excluded we obtained equations for 261 compounds with standard deviations of 0.62 and 0.66 log units. For the 98 carboxylic acids taken sep. we obtained equations with standard deviations of 0.84 and 0.91 log units. Equations for the carboxylic acids were substantially different to those that excluded carboxylic acids, due, we suggest, to the particular dimeric structure of the crystalline carboxylic acids.

Fluid Phase Equilibria published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H8O4, Name: 3-(Methoxycarbonyl)benzoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Guo, Qiyong published the artcileComparative analysis of volatile profiles in four pine-mushrooms using HS-SPME/GC-MS and E-nose, Synthetic Route of 103-26-4, the publication is Food Control (2022), 108711, database is CAplus.

Pine-mushrooms is rich in bioactive compounds, possess a unique aroma profile for culinary art. In China, pine-mushroom has been produced in Southwest and Northeast area. However, the discrepancy of volatile profiles in pine-mushrooms from two regions was unclear due to different extraction and detection method applied in research. This study attempted to compare the volatile profiles of four pine-mushrooms from Southwest (LS) and Northeast (HEB, SY, MDJ) using Headspace Solid Phase Microextraction coupled with Gas Chromatog. Mass Spectrometry (HS-SPME/GC-MS) and Electronic nose (E-nose). showed a significant difference in aroma profiles among samples. A total of 100 volatile compounds were identified, and separated into 11 classes. Benzaldehyde and hexanal were detected in all samples, which could be the pivotal aroma components in pine-mushrooms. Aromatic components, were present in LS pine-mushroom from Southwest China, including abundant of Me (Z)-N-hydroxybenzenecarboximidate, benzaldehyde, and Me 3-phenylprop-2-enoate. Meanwhile, some alcs. (such as oct-1-en-3-ol, hexan-1-ol) were characteristic compounds present in HEB, SY and MDJ samples. Principal component anal. (PCA) of E-nose data showed a clear distinction among samples. In addition, this study also highlighted the correlation between key volatile compounds detected by GC-MS and E-nose sensors, which could be benefit for further explanation to the origin of differences in sensory quality of pine-mushrooms.

Food Control published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Synthetic Route of 103-26-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics