Tag: M.W=150-200

Jankowski, Pawel published the artcileThe reaction of trimethylsilylethylene oxide with α-sulfonyl anions and α,α-sulfonyl dianions. A method for stereocontrolled synthesis of (E)- and (Z)-allylic alcohols, Related Products of esters-buliding-blocks, the publication is Journal of Organometallic Chemistry (1991), 403(1-2), 49-62, database is CAplus.

(Trimethylsilyl)ethylene oxide (I) reacts with α-sulfonyl carbanions, generated from representative primary alkyl Ph sulfones, to give the corresponding O-trimethylsilyl allylic alcs., with higher selectivity for (Z)-isomers. The reaction proceeds by attachment of the nucleophile to the α-position of the α,β-epoxy alkylsilane followed by a carbon-to-oxygen shift of the trimethylsilyl group and expulsion of the benzenesulfonyl anion. The reaction of I with α,α-sulfonyl dianions followed by partial protonation of the immediate adducts affords O-trimethylsilyl allylic alcs., mainly (E)-isomers. The reaction of I with α-sulfonyl carbanions generated from secondary alkyl Ph sulfones affords α-trimethylsilyl carbinols as the only or predominant product. In this case the attachment of the nucleophile takes place at the β-position of the α,β-epoxyalkylsilane. The origin of the regio- and stereoselectivity in reactions of sulfonyl carbanions with α,β-epoxyalkylsilanes is discussed.

Journal of Organometallic 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, Related Products of esters-buliding-blocks.

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

Rolli, Enrico published the artcilePhytotoxic Effects and Phytochemical Fingerprinting of Hydrodistilled Oil, Enriched Fractions, and Isolated Compounds Obtained from Cryptocarya massoy (Oken) Kosterm. Bark, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is Chemistry & Biodiversity (2016), 13(1), 66-76, database is CAplus and MEDLINE.

The hydrodistd. oil of Cryptocarya massoy bark was characterized by GC-FID and GC/MS analyses, allowing the identification of unusual C₁₀ massoia lactone (3, 56.2%), C₁₂ massoia lactone (4, 16.5%), benzyl benzoate (1, 12.7%), C₈ massoia lactone (3.4%), δ-decalactone (5, 1.5%), and benzyl salicylate (2, 1.8%) as main constituents. The phytotoxic activities of the oil, three enriched fractions (lactone-rich, ester-rich, and sesquiterpene-rich), and four constituents (compounds 1, 2, 5, and δ-dodecalactone (6)) against Lycopersicon esculentum and Cucumis sativus seeds and seedlings were screened. At a concentration of 1000 μl/l, the essential oil and the massoia lactone-rich fraction caused a complete inhibition of the germination of both seeds, and, when applied on tomato plantlets, they induced an 85 and 100% dieback, resp. These performances exceeded those of the well-known phytotoxic essential oils of Syzygium aromaticum and Cymbopogon citratus, already used in com. products for the weed and pest management. The same substances were also evaluated against four phytopathogenic bacteria and ten phytopathogenic fungi, providing EC₅₀ values against the most susceptible strains in the 100-500 μl/l range for the essential oil and in the 10-50 μl/l range for compound 6 and the lactone-rich fraction. The phytotoxic behavior was related mainly to massoia lactones and benzyl esters, while a greater amount of 6 may infer a good activity against some phytopathogenic fungi. Further investigations of these secondary metabolites are warranted, to evaluate their use as natural herbicides.

Chemistry & Biodiversity 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, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate.

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

Efremenko, Irena published the artcileCoupled Cluster Benchmark of New DFT and Local Correlation Methods: Mechanisms of Hydroarylation and Oxidative Coupling Catalyzed by Ru(II, III) Chloride Carbonyls, COA of Formula: C10H10O2, the publication is Journal of Physical Chemistry A (2021), 125(40), 8987-8999, database is CAplus and MEDLINE.

We have evaluated a set of accurate canonical CCSD(T) energies for stationary points on the potential energy surface for Ru(II, III) chloride carbonyl catalysis of two competing reactions between benzene and Me acrylate (MA), namely, hydroarylation and oxidative coupling. We have then applied this set to evaluate the performance of localized orbital coupled-cluster methods and several new and common d. functionals. We find that (a) DLPNO-CCSD(T) with TightPNO cutoffs is an acceptable substitute for full canonical CCSD(T) calculations on this system; (b) for the closed-shell systems where it could be applied, LNO-CCSD(T) with tight convergence criteria is very close to the canonical results; (c) the recent ωB97X-V and ωB97M-V functionals exhibit superior performance to commonly used DFT functionals in both closed- and open-shell calculations; (d) the revDSD-PBEP86 revision of the DSD-PBEP86 double hybrid represents an improvement over the original, even though transition metals were not involved in its parametrization; and (e) DSD-SCAN and DOD-SCAN show comparable efficiency. Most tested (meta)-GGA and hybrid d. functionals perform better for open-shell than for closed-shell complexes; this is not the case for the double hybrids considered.

Journal of Physical Chemistry A 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, COA of Formula: C10H10O2.

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

Palialol, Alan R. published the artcileImprovement on properties of experimental resin cements containing an iodonium salt cured under challenging polymerization conditions, Product Details of C11H15NO2, the publication is Dental Materials (2021), 37(10), 1569-1575, database is CAplus and MEDLINE.

The use of resin cements in clin. practice entails photopolymerization through prosthetic devices, which precludes light penetration. The objective of this study was to modify exptl. resin cements (ERCs) with diphenyliodonium hexafluorophosphate (DPI) in an attempt to improve chem. and mech. properties of materials cured with reduced irradiance and final radiant exposure.A co-monomer base containing A 1:1 mass ratio of 2.2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA) was prepared, with 1 mol% of camphorquinone and 2 mol% of Et 4-(dimethylamino)benzoate as initiator system. The resin was divided into 4 fractions according to the DPI concentrations (0, 0.5, 1 and 2 mol%). The challenging polymerization condition was simulated performing the light activation (12, 23 and 46 s) through a ceramic block (3 mm thick). The irradiance was assessed with a calibrated spectrometer (1320 mW/cm²), resulting in three levels of radiant exposure (0.58, 1.1 and 2.2 J/cm²). The polymerization kinetics was evaluated in real-time using a spectrometer (Near-IR). Water sorption and solubility was analyzed and the cohesive strength of resins obtained through the microtensile test. Polymerization stress was assessed by Bioman method.Resins containing DPI had higher degree of conversion and rate of polymerization than the control (without DPI). The use of DPI reduced water sorption and solubility, and led to higher cohesive strength compared to resins without the iodonium salt. However, the stress of polymerization was higher for exptl. resins with DPI.Even under remarkably reduced irradiance, cements containing A ternary initiating system with an iodonium salt can present an optimal degree of conversion and chem./mech. properties.

Dental Materials 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, Product Details of C11H15NO2.

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

Kanafusa, Sumiyo published the artcileInfluence of pulsed electric field-assisted dehydration on the volatile compounds of basil leaves, Related Products of esters-buliding-blocks, the publication is Innovative Food Science & Emerging Technologies (2022), 102979, database is CAplus.

Pulsed elec. field (PEF) was applied to basil leaves prior air drying at 40°C. The parameters of the elec. treatment were designed in such a way that (i) electroporated the tissue reversibly, provoking a permanent opening of the stomatal guard cells and (ii) electroporated the tissue irreversibly, damaging the cells. Treated leaves lost some volatile compounds due to both PEF treatments, probably related with the direct effect of permeabilization on the secretory cells of glandular trichomes. Upon drying, the irreversible permeabilization treatment showed the highest influence on the profile of volatiles in the dried leaves showing better retention of some terpenoids than the control. The performed statistical anal. allowed to select six compounds that can be used as markers both for the effect of pre-treatments prior dehydration and for the effects of dehydration itself on the volatile compounds of basil leaves.

Innovative Food Science & Emerging Technologies 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, Related Products of esters-buliding-blocks.

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

Neves dos Santos, Fabio published the artcileMetabolite mass spectrometry profiling of cacao genotypes reveals contrasting resistances to, SDS of cas: 103-26-4, the publication is Electrophoresis (2021), 42(23), 2519-2527, database is CAplus and MEDLINE.

Ceratocystis wilt is a lethal disease of cacao, and the search for resistant genotypes may provide the best way to deal with the disease. Resistance or susceptibility behavior of some cacao genotypes when infected by Ceratocystis cacaofunesta is not yet understood. Herein, we report an LC-MS metabolomic screening anal. based on high-resolution MS to obtain comprehensive metabolic profile associated with multivariate data anal. of PLS-DA, which was effective to classify CCN-51 and TSH-1188 as resistant genotypes to C. cacaofunesta fungus, while CEPEC2002 was classified as a susceptible one. Using reversed-phase LC method, electrospray interface, and high-resolution tandem MS by the quadrupole-TOF analyzer, the typical profiles of metabolites, such as phenylpropanoids, flavonoids, lipids, alkaloids, and amino acids, were obtained. Untargeted metabolite profiles were used to construct discriminant anal. by partial least squares (PLS-DA)-derived loading plots, which placed the cacao genotypes into two major clusters related to susceptible or resistant groups. Linolenic, linoleic, oleic, stearic, arachidonic, and asiatic acids were annotated metabolites of infected, susceptible, and resistant genotypes, while Me jasmonate, jasmonic acid, hydroxylated jasmonic acid, caffeine, and theobromine were annotated as constituents of the resistant genotypes. Trends of these typical metabolites levels revealed that CCN51 is susceptible, CEPEC2002 is moderately susceptible, and TSH1188 is resistant to C. cacaofunesta. Therefore, profiles of major metabolites as screened by LC-MS offer an efficient tool to reveal the level of resistance of cacao genotypes to C. cacaofunesta present in any farm around the world.

Electrophoresis 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, SDS of cas: 103-26-4.

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

Ramesh, C. published the artcileA simple, mild and efficient procedure for selective cleavage of prenyl esters using silica-supported sodium hydrogen sulphate as a heterogeneous catalyst, Name: 3-Methylbut-2-en-1-yl benzoate, the publication is Tetrahedron Letters (2003), 44(7), 1465-1467, database is CAplus.

Prenyl esters were selectively and efficiently cleaved under slightly acidic reaction conditions using silica-supported sodium hydrogen sulfate as a heterogeneous catalyst at room temperature to regenerate the parent carboxylic acids in very high yields.

Tetrahedron Letters 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, Name: 3-Methylbut-2-en-1-yl benzoate.

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

Pansare, Sunil V. published the artcileMagnesium bromide catalyzed acylation of alcohols, Safety of 3-Methylbut-2-en-1-yl benzoate, the publication is Synthetic Communications (2000), 30(14), 2587-2592, database is CAplus.

Magnesium bromide is an efficient catalyst for the acetylation and benzoylation of a variety of primary and secondary alcs. with the resp. acid anhydrides at ambient temperature Acetylation of tertiary alcs. requires subambient temperature to suppress competing dehydration. Coordinating solvents retard the acylation process.

Synthetic Communications 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, Safety of 3-Methylbut-2-en-1-yl benzoate.

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

Sajedi, Mohammad published the artcile2-Pyridyl-Benzimidazole-Pd(II) Complex Supported on Magnetic SBA-15: An Efficient and Magnetically Retrievable Catalyst for the Heck Reaction, Quality Control of 103-26-4, the publication is ChemistrySelect (2021), 6(46), 13060-13067, database is CAplus.

2-(2′-Pyridyl)benzimidazole (PyBzIm) was grafted onto magnetic mesoporous silica particles (Fe₃O₄@SBA) via a simple click reaction, and then further reacted with Na₂PdCl₄ in methanol. The catalyst, Fe3O4@SBA-PyBzIm-Pd(II), was characterized by FT-IR, thermogravimetric anal. (TGA), vibrating sample magnetometry (VSM), Brunauer-Emmett-Teller surface area measurement (SBET), and wide-angle X-ray diffraction spectroscopy (XRD). XPS studies confirmed some C=N nitrogen atoms interacted with palladium in the +2 oxidation state. The supported complex was found to catalyze the Heck cross-coupling reaction of aryl halides and olefins. The catalyst also presented excellent recycling efficiency over six consecutive runs without significant loss of reactivity.

ChemistrySelect 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, Quality Control of 103-26-4.

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

Wang, Peng published the artcileCatalytic Azido-Hydrazination of Alkenes Enabled by Visible Light: Mechanistic Studies and Synthetic Applications, Quality Control of 5205-11-8, the publication is Advanced Synthesis & Catalysis (2019), 361(24), 5565-5575, database is CAplus.

A visible-light-enabled catalytic intermol. azido-hydrazination method for unactivated alkenes was developed via an orderly radical addition sequence. This transformation features metal-free and redox-neutral conditions and was applicable to a wide range of alkenes with com. available reagents. Mechanistic and kinetic studies reveal that the efficient generation of azide radical enabled by fluorenone under visible-light was critical to this methodol. The β-azido alkyl hydrazines prepared with this reaction can be conveniently derived to valuable synthetic building blocks, and one of the products has been successfully applied in the total synthesis of (±)-ibrutinib, which was used to treat B cell cancers.

Advanced Synthesis & Catalysis 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 C12H16N2O2, Quality Control of 5205-11-8.

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