Month: November 2022

Guerin, P. M. published the artcileSex pheromone of Adoxophyes orana: additional components and variability in ratio of (Z)-9- and (Z)-11-tetradecenyl acetate, Recommanded Product: (Z)-Dodec-9-en-1-yl acetate, the publication is Journal of Chemical Ecology (1986), 12(3), 763-72, database is CAplus and MEDLINE.

Twelve products related to the sex pheromone main components (Z)-9- and (Z)-11-tetradecenyl acetate (Z9-14:Ac and Z11-14:Ac, resp.), were identified in female pheromone gland extracts of the laboratory-reared summerfruit tortrix moth, A. orana. These are the geometric isomers and the alcs. of the main components, (Z)-9-dodecenyl acetate, (Z)-11-hexadecenyl acetate, and saturated acetates of 12-22 carbons. The ratios of Z9-14:Ac to Z11-14:Ac in individuals varied from 3.5:1 to 11:1 with an average of 6.2; their total added up to 462 ng/female with an average of 182 ng for 2- to 7-day-old individuals. No qual. or quant. differences were observed between laboratory and field insects. Z9-14:Ac, Z11-14:Ac and the corresponding alcs. were also found in female effluvia. Addition of either of the 2 alcs. to a blend of the 2 acetates augmented trap catch in the field. The same was true for (Z)-9,(E)-12-tetradecadienyl acetate which was not detected in gland extracts

Journal of Chemical Ecology published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C14H26O2, Recommanded Product: (Z)-Dodec-9-en-1-yl acetate.

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

Yu, Jeongjae published the artcileSynthesis of new C3 symmetric amino acid- and aminoalcohol-containing chiral stationary phases and application to HPLC enantioseparations, Product Details of C22H12F6O6S2, the publication is Chirality (2018), 30(1), 74-84, database is CAplus and MEDLINE.

We recently reported a new C3-sym. (R)-phenylglycinol N-1,3,5-benzenetricarboxylic acid-derived chiral high-performance liquid chromatog. (HPLC) stationary phase (CSP 1) that demonstrated better results as compared to a previously described N-3,5-dintrobenzoyl (DNB) (R)-phenylglycinol-derived CSP. Over a decade ago, (S)-leucinol, (R)-phenylglycine, and (S)-leucine derivatives were used as the starting materials of 3,5-DNB-based Pirkle-type CSPs for chiral separation In this study, three new C3-sym. CSPs (CSP 2, 3, and 4) were prepared by combining the ideas and results mentioned above. Here we describe the synthetic procedures and applications of the new C3-sym. CSPs (CSP 2-CSP 4).

Chirality published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C7H3Cl2NO, Product Details of C22H12F6O6S2.

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

Aiken, Stuart published the artcileAn intramolecular, Pd-mediated α-arylation route to 4-aryl-2-naphthols, Recommanded Product: Methyl 2-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate, the publication is Tetrahedron Letters (2015), 56(33), 4840-4842, database is CAplus.

1-Aryl-1-(2-bromophenyl)but-2-yn-1-ols, obtained from the addition of prop-1-yn-1-yllithium to 2-bromobenzophenones, readily rearrange to 4-aryl-4-(2-bromophenyl)but-3-en-2-ones upon treatment with TFA. Subsequent intramol. Pd-mediated α-arylation of these but-3-en-2-ones gave 4-aryl-2-naphthols which were smoothly transformed into photochromic naphthopyrans.

Tetrahedron Letters published new progress about 956229-86-0. 956229-86-0 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic acid and ester, name is Methyl 2-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate, and the molecular formula is C15H21BO4, Recommanded Product: Methyl 2-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate.

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

Li, Xiao published the artcileDirected Self-Assembly of Colloidal Particles onto Nematic Liquid Crystalline Defects Engineered by Chemically Patterned Surfaces, Related Products of esters-buliding-blocks, the publication is ACS Nano (2017), 11(6), 6492-6501, database is CAplus and MEDLINE.

In exploiting topol. defects of liquid crystals as the targeting sites for trapping colloidal objects, previous work has relied on topog. features with uniform anchoring to create defects, achieving limited d. and spacing of particles. We report a generalizable strategy to create topol. defects on chem. patterned surfaces to assemble particles in precisely defined locations with a tunable interparticle distance at nanoscale dimensions. Informed by exptl. observations and numerical simulations that indicate that liquid crystals, confined between a homeotropic-anchoring surface and a surface with lithog. defined planar-anchoring stripes in a homeotropic-anchoring background, display splay-bend deformation, we successfully create pairs of defects and subsequently trap particles with controlled spacing by designing patterns of intersecting stripes aligned at 45° with homeotropic-anchoring gaps at the intersections. Application of elec. fields allows for dynamic control of trapped particles. The tunability, responsiveness, and adaptability of this platform provide the opportunities for assembly of colloidal structures toward functional materials.

ACS Nano published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Related Products of esters-buliding-blocks.

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

Waring, Paul published the artcileThe dihydropteridine reductase (human brain) [substrate] activity of some lipophilic quinonoid dihydropterins, COA of Formula: C8H16O2, the publication is European Journal of Medicinal Chemistry (1987), 22(2), 83-90, database is CAplus.

I [R¹ = Et, Pr, Me(CH₂)₅, PhCH₂CH₂, and neopentyl; R² = H] and I (R¹ = H, R² = neopentyl) were prepared by reduction of the corresponding II with PtO₂. Oxidation of I‘s gave the corresponding III which were good substrates for dihydropteridine reductase from human brain when compared with the natural cofactor quinonoid dihydrobiopterin III [R¹ = 6R (1R,2′S)-1′,2′-dihydroisopropyl, R² = H), III (R¹ = Me, R² = H), III (R¹ = H, R² = Me) and quinonoid dihydrofolic acid III (R¹ = p-methylaminobenzoylglutamic acid, R² = H). In contrast 5-(2-propylimino) and 5-(2-octylimino)-2,4-diaminopyrimidin-6(1H)-ones were devoid of substrate or inhibitor activities. The potential use of these lipophilic pterins in the therapy of diseases where there is a deficiency of tetrahydrobiopterin is discussed.

European Journal of Medicinal Chemistry published new progress about 5340-78-3. 5340-78-3 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is Ethyltert-butylacetate, and the molecular formula is C8H14O2, COA of Formula: C8H16O2.

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

Celeiro, Maria published the artcileHazardous compounds in recreational and urban recycled surfaces made from crumb rubber. Compliance with current regulation and future perspectives, Quality Control of 627-93-0, the publication is Science of the Total Environment (2021), 755(Part_1), 142566, database is CAplus and MEDLINE.

Crumb rubber obtained from scrap tires is greatly employed for the construction of different facilities for sport, recreational and other uses. However, in recent years the concern about their safety and the related adult and children exposure to these surfaces is growing. This study aims a thorough chem. characterization encompassing 42 hazardous compounds, including polycyclic aromatic hydrocarbons (PAHs), phthalates, adipates, antioxidants and vulcanization agents in a wide range of crumb rubber from different surfaces. For the extraction of the target compounds, a method based on ultrasound-assisted extraction followed by gas chromatog.-tandem mass spectrometry (UAE-GC-MS/MS) was validated. Forty crumb rubber samples coming from synthetic turf football pitches, outdoor and indoor playgrounds, urban pavements, com. tiles and granulates, and scrap tires, were analyzed. In addition, green alternative materials, such as sand and artificial turf based on cork granulate infill were included to compare the levels of the target compounds with those of crumb rubber. Most of the analyzed recycled surfaces meet the recent limits proposed by the European Commission for rubber granulates and mulches, although they exceed in several cases the maximum levels allowed for rubber consumer products. Besides, most of the other target compounds, including several of them considered as endocrine disruptors, were detected in the analyzed samples, reaching ppm concentrations

Science of the Total Environment 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, Quality Control of 627-93-0.

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

Celeiro, Maria published the artcileEvaluation of chemicals of environmental concern in crumb rubber and water leachates from several types of synthetic turf football pitches, Application of Dimethyl adipate, the publication is Chemosphere (2021), 128610, database is CAplus and MEDLINE.

Nowadays concern exists about the safety for both football players and the environment of recycled tire rubber used as infill in synthetic turf football pitches. In this study 40 target compounds, including polycyclic aromatic hydrocarbons (PAHs), plasticizers, antioxidants and vulcanization agents were determined in 50 synthetic football pitches of diverse characteristics to estimate environmental risks. This is the first study of crumb rubber sport facilities in Portugal. Analyses were performed by ultrasound-assisted extraction followed by gas chromatog.-tandem mass spectrometry (UAE-GC-MS/MS). To evaluate the transfer of the target chems. from the crumb rubber to the runoff water, water leachates collected from several football pitches were analyzed by solid-phase microextraction (SPME-GC-MS/MS). In addition, lab-scale runoff simulation experiments were performed to assess whether a persistent inflow of the target compounds from the football pitches into the runoff water wcould exist. Results revealed the presence of most of the target PAHs in crumb rubber at total concentrations up to 57μg g-1, next to a high number of plasticizers and vulcanization agents. Runoff water collected from the football pitches contained up to 13 PAHs as well as other chems. of environmental concern. In addition, continuous leaching of chems. from the crumb rubber to the surrounding water was demonstrated. The transfer of target chems. into the runoff water poses a potential risk for the aquatic environment.

Chemosphere 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, Application of Dimethyl adipate.

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

Wakamura, Sadao published the artcileSex pheromone of the fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) of a “Far East” population from Okinawa, Japan, Safety of (Z)-Dodec-9-en-1-yl acetate, the publication is Applied Entomology and Zoology (2021), 56(1), 19-25, database is CAplus.

Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is native to the Americas and has recently invaded Okinawa, Japan via Africa, South Asia and China. Gas chromatog./mass spectrometry analyses of hexane extracts of 100 abdominal glands of Okinawan females revealed six candidate compounds for sex pheromone, (Z)-9-tetradecenyl acetate (Z9-14:Ac, ca. 6 ng/female), (Z)-11-hexadecenyl acetate, (Z)-11-tetradecenyl acetate, (Z)-7-dodecenyl acetate (Z7-12:Ac), (E)-9-dodecenyl acetate, and (Z)-9-tetradecen-1-ol at the ratio of 100:10:1.3:0.90:0.13:1.8, resp. In Okinawa, only small numbers of males were captured with the original blend of these compounds However, much more males were attracted to a 100:3 blend of Z9-14:Ac and Z7-12:Ac that had been suggested by others to be the most effective blend in a Florida population. In another test in Okinawa, even more males were captured with a 100:1 blend of these compounds than with a 100:3 blend. Significant numbers of males of other moths, Mythimna loreyi (Duponchel) and Chrysodeixis eriosoma (Doubleday), were also attracted to blends of Z9-14:Ac and Z7-12:Ac when the ratio of the latter to the former compound was increased from 100:1 to 100:10. Based on these results we concluded that the most powerful as well as convenient sex pheromone formulation to monitor S. frugiperda populations in Okinawa was a 100:1 blend of Z9-14:Ac and Z7-12:Ac.

Applied Entomology and Zoology published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C15H12O8, Safety of (Z)-Dodec-9-en-1-yl acetate.

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

Chen, Gong published the artcileDirhodium-Catalyzed Chemo- and Site-Selective C-H Amidation of N,N-Dialkylanilines, Safety of Ethyl 4-dimethylaminobenzoate, the publication is Synlett (2021), 32(7), 728-732, database is CAplus.

A method for dirhodium-catalyzed C(sp³)-H amidation of N,N-dimethylanilines was developed. Chemoselective C(sp³)^–H amidation of N-Me group proceeded exclusively in the presence of C(sp²)-H bonds of the electron-rich aromatic ring. Site-selective C(sp³)-H amidation proceeded exclusively at the N-Me group of N-methyl-N-alkylaniline derivatives with secondary, tertiary, and benzylic C(sp³)-H bonds α to a nitrogen atom.

Synlett published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Safety of Ethyl 4-dimethylaminobenzoate.

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

Abadleh, Mohammed M. published the artcileFacile synthesis of model 2,4-diaryl-1,3,4-thiadiazino[5,6-h]fluoroquinolones, Synthetic Route of 924-99-2, the publication is Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences (2019), 74(6), 507-512, database is CAplus.

A Selected set of 2,4-diaryl-7-oxo-1,2,4-thiadiazino[5,6-h]quinoline-8-carboxylic acids I (Ar = C₆H₅, 4-MeC₆H₅, 4-FC₆H₅, etc.) has been prepared via reaction of the parent 7-chloro-8-nitro-10-cyclopropyl-6-fluoroquinolone with the appropriate N’-(aryl)benzothiohydrazides in presence of triethylamine. Structures of the new heterocyclics I are supported by spectral data and confirmed by single-crystal X-ray crystallog. for I (Ar = C₆H₅).

Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences published new progress about 924-99-2. 924-99-2 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Amine,Aliphatic hydrocarbon chain,Ester, name is Ethyl 3-(dimethylamino)acrylate, and the molecular formula is C7H13NO2, Synthetic Route of 924-99-2.

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