Month: January 2023

(Pentamethylcyclopentadienyl)Iridium Dichloride Dimer {[IrCp*Cl₂]₂}: A Novel Efficient Catalyst for the Cycloisomerizations of Homopropargylic Diols and N-Tethered Enynes was written by Benedetti, Erica;Simonneau, Antoine;Hours, Alexandra;Amouri, Hani;Penoni, Andrea;Palmisano, Giovanni;Malacria, Max;Goddard, Jean-Philippe;Fensterbank, Louis. And the article was included in Advanced Synthesis & Catalysis in 2011.Synthetic Route of C10H14O4 This article mentions the following:

(Pentamethylcyclopentadienyl)iridium dichloride dimer {[IrCp*Cl₂]₂}-catalyzed hydroalkoxylation of bis-homopropargylic alcs. provides an efficient access to dioxabicyclo[2.2.1]ketals. The cycloisomerizations proceed under mild conditions, with low catalytic loadings and short reaction times. This new protocol involving an Ir(III) catalyst also promoted the cycloisomerization of nitrogen-tethered 1,6-enynes to give azabicyclo[4.1.0]heptenes, enhancing the synthetic potential of our method. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Synthetic Route of C10H14O4).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Synthetic Route of C10H14O4

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

Three-dimensional quantitative structure-activity relationship study on gas chromatographic retention index of the fragrance compounds of Liliumspp was written by Jiao, Long;Wang, Yuan;Tai, Wenliang;Liu, Huanhuan;Xue, Zhiwei;Wang, Yanzhao. And the article was included in Sepu in 2020.Application of 118-61-6 This article mentions the following:

Quant. structure-activity relationship models on the gas chromatog. retention index of the 38 volatile fragrance compounds of Liliumspp were investigated and established by comparative mol. field anal. (CoMFA) and comparative mol. similarity index (CoMSIA) methods. The robustness and predictive performance of the developed models were assessed using external test set validation and leave-one-out cross validation. Further, the effects of the mol. structure on the gas chromatog. retention indexes of these compounds were intuitively studied in light of the three-dimensional contour maps of mol. fields provided by the developed CoMSIA and CoMFA models. The validation results demonstrated that both the models could accurately predict the retention indexes of the investigated components. The influence of the mol. structure on the retention indexes could be reasonably explained by these models. Moreover, the prediction accuracy of the CoMSIA model was slightly higher than that of the CoMFA model. Obviously, the proposed CoMSIA model is more promising for the anal. of the volatile fragrance compounds of Lilium spp. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Application of 118-61-6).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Application of 118-61-6

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

Preparation and Properties of a Modified Fe₂O₃ Pigment for Dope Dyeing Ultrahigh Molecular Weight Polyethylene (UHMWPE) Fibers by Melt Spinning was written by Wang, Xiaochun;Zhang, Liping;Liu, Ming;Zhang, Jianfei;Zhao, Guoliang. And the article was included in Fibers and Polymers in 2021.Reference of 6683-19-8 This article mentions the following:

The poor compatibility between a Fe₂O₃ pigment and a blend of ultrahigh mol. weight polyethylene (UHMWPE)/polyolefin (PO) can result in low spinnability and poor mech. properties of the resulting fiber. This study modifies the surface of a Fe₂O₃ pigment with a titanate coupling agent for dope dyeing melt-spun UHMWPE fiber. The effects of the coupling agent dose, reaction temperature and reaction time on the surface properties of the pigments are investigated. In addition, the characteristics of the UHMWPE blend and colored fibers (by dope dyeing with modified and unmodified Fe₂O₃ pigments) are compared. Notably, 3 weight% coupling agent in regard to the pigments mass, a coupling agent to toluene mass ratio of 1:5, a reaction time of 30 min, and a reaction temperature of 80°C achieve the optimal results, which are a 48.4% lipophilic degree of the modified pigment, a zeta potential of 48.4 mV, and a contact angle of 144.3°. Moreover, SEM images and torque results of the blend melt show that the compatibility between the Fe₂O₃ pigment and UHMWPE/PO blend is significantly enhanced. With an increasing pigment content, the mech. properties of the colored fibers decrease, and the K/S values of the colored fibers increase. In the experiment, the researchers used many compounds, for example, 2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8Reference of 6683-19-8).

2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Reference of 6683-19-8

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

Derivatives of 1-methoxy-3-trimethylsilyloxy-1,3-butadiene for Diels-Alder reactions was written by Danishefsky, Samuel;Yan, Cheng-Feng;Singh, Rajendra K.;Gammill, Ronald B.;McCurry, Patrick M. Jr.;Fritsch, Nancy;Clardy, Jon. And the article was included in Journal of the American Chemical Society in 1979.Safety of Methyl 4-Hydroxy-2-methoxybenzoate This article mentions the following:

The preparation and Diels-Alder cycloadditions of the following highly functionalized dienes are described: (1) (E)-1-methoxy-2-methyl-3-trimethylsilyloxy-1,3-butadiene, (2) (E,Z)-1-methoxy-3-trimethylsilyloxy-4-methyl-1,3-butadiene, (3) (E,Z)-1-methoxy-2,4-dimethyl-3-trimethylsilyloxy-1,3-butadiene, (4) (E,Z)-1-methoxy-3-trimethylsilyloxy-4-phenylseleno-1,3-butadiene, and (5) 1,1-dimethoxy-3-trimethylsilyloxy-1,3-butadiene. The use of these dienes in Diels-Alder reactions enables rapid access to diversely functionalized aromatics, cyclohexenones, cyclohexadienones, and 3-methoxycyclohexenones. In the experiment, the researchers used many compounds, for example, Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8Safety of Methyl 4-Hydroxy-2-methoxybenzoate).

Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Safety of Methyl 4-Hydroxy-2-methoxybenzoate

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

The impact of Hanseniaspora vineae fermentation and ageing on lees on the terpenic aromatic profile of white wines of the albillo variety was written by Del Fresno, Juan Manuel;Escott, Carlos;Loira, Iris;Carrau, Francisco;Cuerda, Rafael;Schneider, R. Emi;Banuelos, Maria Antonia;Alez, Carmen Gonz;Arez-Lepe, Jos E. Antonio Su;Morata, Antonio. And the article was included in International Journal of Molecular Sciences in 2021.Synthetic Route of C9H10O3 This article mentions the following:

Hanseniaspora vineae is a non-Saccharomyces yeast that has a powerful impact on the sensory profile of wines. Its effect on the aromatic profile of non-aromatic grape varieties, such as Albillo Mayor (Vitis vinifera, L.), during vinification is a useful biotechnol. to improve sensory complexity. Fermentation in steel barrels using Hanseniaspora vineae and sequential inoculation with Saccharomyces cerevisiae have been used to study the formation of terpenes and cell lysis in the production of Albillo white wines. The GC-MS anal. profile shows a significant effect of H. vineae fermentation on the contents of terpenes (≈Ã?3), mainly in linalool (>× 3), β-citronellol (>× 4), geraniol (>× 2) and a-terpineol (≈Ã?2). The contents of several polyoxygenated terpenes and some volatile phenols with a spicy aroma were increased during fermentation In summary, Hanseniaspora vineae releases a large number of cell wall polysaccharides during fermentation that affect wine palatability and structure. Hanseniaspora vineae is a powerful bio-tool to enhance the fruitiness, floral notes and freshness in non-aromatic white varieties. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Synthetic Route of C9H10O3).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Synthetic Route of C9H10O3

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

Pyridine-Functionalized Luminescent Organoboron Quinolate Block Copolymers as Versatile Building Blocks for Assembled Nanostructures was written by Cheng, Fei;Bonder, Edward M.;Salem, Shadwa;Jakle, Frieder. And the article was included in Macromolecules (Washington, DC, United States) in 2013.Recommanded Product: Benzyl benzodithioate This article mentions the following:

Novel luminescent boron quinolate block copolymers with pyridine functionalities were prepared via RAFT polymerization and employed as building blocks for assembled nanostructures. In selective solvents, the block copolymers self-assembled into vesicles, spherical and extended branched aggregates. Quaternization reactions were performed to modify the solubility of the block copolymers and to prepare a crosslinked polymeric gel. As polymeric Lewis bases, the pyridine-functionalized block copolymers are able to form supramol. complexes with metal ions and Lewis acids. Coordination to ZnCl₂ in chloroform led to spherical micelles or larger aggregates. The supramol. coassembly of PS-b-PBQPy-1 and zinc meso-tetraphenylporphyrin (ZnTPP) in cyclohexane as a selective solvent for PS resulted in extended branched structures with controllable emission properties. Energy transfer from the boron chromophores to the ZnTPP moieties was observed in these supramol. complexes. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Recommanded Product: Benzyl benzodithioate).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Recommanded Product: Benzyl benzodithioate

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

1,5-Diketones Synthesis via Three-Component Cascade Reaction was written by Xing, Li-Juan;Lu, Tao;Fu, Wei-Li;Lou, Mei-Mei;Chen, Bo;Wang, Zhi-Shen;Jin, Yang;Li, Dan;Wang, Bin. And the article was included in Advanced Synthesis & Catalysis in 2015.Formula: C9H10O3S This article mentions the following:

A mild and efficient cascade synthesis of 1,5-diketones from readily available N,N-dicyclohexylmethylamine, 1,3-dicarbonyl compounds, and trifluoromethyl β-diketones has been developed. This cascade reaction occurs via an oxidation/Mannich reaction/Cope elimination/Michael addition/retro-Claisen reaction sequence, and provides multiple C-C bond formations in one pot. In addition, exquisite chemoselectivity is achieved in the reaction between 1,3-dicarbonyl compounds and trifluoromethyl β-diketones. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Formula: C9H10O3S).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Formula: C9H10O3S

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

Influence of the Internal Structure and Intermolecular Interactions on the Correlation between Structural (α) and Secondary (β-JG) Relaxation below the Glass Transition Temperature in Neat Probucol and Its Binary Mixtures with Modified Saccharides was written by Minecka, A.;Tarnacka, M.;Jurkiewicz, K.;Hachula, B.;Kaminski, K.;Paluch, M.;Kaminska, E.. And the article was included in Journal of Physical Chemistry B in 2020.Related Products of 4163-60-4 This article mentions the following:

Broadband dielec. spectroscopy (BDS) has been used to study the mol. dynamics and aging process in neat probucol (PRO) as well as its binary mixtures with selected acetylated saccharides. In particular, we applied the Casalini and Roland approach to determine structural relaxation times in the glassy state of the examined systems (so-called isostructural times, τ_iso). Next, using the calculated τ_iso, primitive relaxation times of the coupling model were obtained and compared to the exptl. secondary β (Johari-Goldstein (JG) type) relaxation times. Interestingly, it turned out that there is a correlation between the β-JG and the structural (α)-relaxation processes below the glass transition temperature (T < T_g) in each investigated sample. This is a new observation compared to previous studies demonstrating that such a relationship exists only in the supercooled liquid state of neat PRO. Moreover, it was revealed that the stretching parameters obtained from the aging procedure are very close to the ones determined by fitting the dielec. data above the T_g with the use of the Kohlrausch-Williams-Watts function, indicating that the aging process is governed by the α-relaxation. Complementary Fourier transform IR and X-ray diffraction measurements allowed us to find a possible reason for these findings. It was demonstrated that although there are very weak intermol. interactions between PRO and modified saccharides, the intra- and intermol. structure of PRO is practically unaffected by the presence of modified saccharides. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4Related Products of 4163-60-4).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Related Products of 4163-60-4

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

Synthesis of dl-muscone by acyloin cyclization was written by Yao, Qian-Yuan;Chen, Xue;Gao, Zhao-Yun;Zhao, Wen-Zhi. And the article was included in Huaxue Xuebao in 1980.Application of 3903-40-0 This article mentions the following:

dl-Muscone (I) was prepared in 9 steps from cyclohexanone and NCCH₂CO₂Et by acyloin cyclization of di-Me β-methylpentadecanedioate, which was prepared by anodic coupling of HO₂C(CH₂)₁₂CO₂Me with HO₂CCH₂CHMeCH₂CO₂Me. I was separated from its isomer II by silica gel column chromatog. The I:II ratio in the product was 7:3. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Application of 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application of 3903-40-0

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

Identification of the novel odor active compounds “p-menthane lactones” responsible for the characteristic aroma of fresh peppermint leaf was written by Shigeto, Atsushi;Wada, Atsushi;Kumazawa, Kenji. And the article was included in Bioscience, Biotechnology, and Biochemistry in 2020.Reference of 868-57-5 This article mentions the following:

The comparative aroma extract dilution anal. (cAEDA) applied to the volatile fractions of two types of fresh mint leaves (Peppermint and Spearmint) revealed 20 odor-active peaks with high FD factors (â‰?4). Among the perceived odorants, five “sweet/milky” and “caramel-like/spicy” notes showing high FD factors were characteristic for the peppermint aroma, and were identified as p-menthane lactone derivatives Especially, the three p-menthane lactone derivatives, “rel-(3S,3aS,6R,7aS)-dihydromintlactone, (3S,3aS,6R)-epoxymenthofurolactone, and 2E-ethylidene-5-methylcyclohexanone”, were newly identified compounds in the peppermint. The biosynthetic routes of the p-menthane lactone derivatives have been suggested to be closely related to menthofuran. Therefore, these findings strongly suggest the possibility that the biosynthetic pathway leading to the p-menthane lactone derivatives via menthofuran plays a significantly important role in the formation of the characteristic aroma of peppermint. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Reference of 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Reference of 868-57-5

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