Tag: M.W=200-250

Yaghoobi, Mehrdad published the artcileAutomatic Cocrystal Detection by Raman Spectral Deconvolution-Based Novelty Analysis, Related Products of esters-buliding-blocks, the publication is Analytical Chemistry (Washington, DC, United States) (2021), 93(43), 14375-14382, database is CAplus and MEDLINE.

Cocrystals are important mol. adducts that have many advantages as a means of modifying the physicochem. properties of active pharmaceutical ingredients, including taste masking and improved solubility, bioavailability, and stability. As a result, the discovery of new cocrystals is of great interest to com. drug discovery programs. Time-consuming manual anal. of the large volumes of data that emerge from large-scale cocrystal screening programs of up to 1000s of preparations poses a challenge. Raman spectroscopy has been shown to discriminate between cocrystals and phys. mixtures and is easy to automate, allowing rapid screening of large numbers of potential cocrystals, but the spectral features that encode the information are often subtle (e.g., slight changes in peak positions or intensities). We have employed an automated signal processing routine based on a sparse decomposition algorithm to speed up the data processing steps while maintaining the accuracy of a trained spectroscopist. We used our algorithm to screen 31 potential cocrystal preparations and found that through the use of a computationally generated threshold, we could achieve a clear classification of cocrystals and phys. mixtures in less than a minute, compared to several hours manually.

Analytical Chemistry (Washington, DC, United States) published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C12H14O2, Related Products of esters-buliding-blocks.

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

Hellmann, Christoph published the artcileDesign of pheromone releasing nanofibers for plant protection, Name: (Z)-Dodec-9-en-1-yl acetate, the publication is Polymers for Advanced Technologies (2011), 22(4), 407-413, database is CAplus.

Plants tend to attract diseases quite similar to human beings. Pesticides tend to be used to control such diseases. An alternative route, at least as far as damages from insects is concerned, envisions the application of pheromones. These cause a disorientation of male insects so that they are no longer able to locate the females, which finally gives rise to suppression of reproduction The approach considered in this paper is based on the release of pheromones from polymer carriers, in particular, from nanofibers webs as obtained by electrospinning. These may be distributed across the field quite similar to spider webs. The pheromones are required to be incorporated in sufficiently high concentrations in the nanofibers via electrospinning and to be released from the nanofibers for a sufficiently long time expanding over several weeks to months. Polyamide 6 as well as cellulose acetate was used as a polymer carrier in the investigations reported in this contribution. Studies reveal that fluid pheromones can, in fact, be incorporated in the nanofibers to more than 33 weight%. They may undergo a nanoscalar phase separation within the fibers during electrospinning. Furthermore, thermogravimetric studies revealed via in vitro release studies that the pheromones are released from the nanofibers in a nearly linear fashion over a period covering many weeks. Copyright © 2009 John Wiley & Sons, Ltd.

Polymers for Advanced Technologies 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, Name: (Z)-Dodec-9-en-1-yl acetate.

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

Reed, D. W. published the artcileField trapping of three Epinotia species with (Z,Z)-7,9-dodecadienyl acetate (Lepidoptera: Tortricidae), SDS of cas: 16974-11-1, the publication is Journal of Chemical Ecology (1985), 11(10), 1389-98, database is CAplus and MEDLINE.

A field survey of the geometrical isomers of 7,9-dodecadienyl alc., acetate, and aldehyde has resulted in attractants and inhibitors for 3 species of tortricid moths. Epinotia silvertoniensis And an undescribed Epinotia species were all attracted to (Z,Z)-7,9-dodecadienyl acetate. Another Epinotia species was attracted to (Z,Z)-7,9-dodecadienyl acetate and (Z,Z)-7,9-dodecadien-1-ol. Electroantennogram data and inhibition patterns for one of the Epinotia species were also reported. In addition, E. criddleana was attracted to lures containing (E)-9-dodecenyl acetate.

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, SDS of cas: 16974-11-1.

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

Lee, Myongsoo published the artcileInduction of Thermotropic Liquid Crystalline Phases in Coil-Rod-Coil Triblock Molecules Containing Poly(propylene oxide) through Complexation with LiCF₃SO₃, Synthetic Route of 50670-76-3, the publication is Chemistry of Materials (1998), 10(7), 1894-1903, database is CAplus.

The preparation and thermotropic phase behavior of coil-rod-coil triblock mols. of dodecyl 4-(4-oxy-4′-biphenylcarbonyloxy)-4′-biphenylcarboxylate with poly(propylene oxide) of seven (7-22) and twelve (12-22) propylene oxide subunits and the complexes of the triblock mols. with LiCF₃SO₃ are presented. Both 7-22 and 12-22 appear to be crystalline solids. However, the complexation of 7-22 and 12-22 with LiCF₃SO₃ induces an enantiotropic liquid crystalline phase. The complexes of 7-22 with 0.05-0.20 mol of LiCF₃SO₃ per propylene oxide unit exhibit an enantiotropic smectic A mesophase. In contrast, a significant phase change is observed upon complexation of 12-22 with LiCF₃SO₃. The complex of 12-22 with 0.10 mol of LiCF₃SO₃ exhibits a smectic A mesophase. However, the complexes with 0.15-0.30 mol of LiCF₃SO₃ display a hexagonal columnar mesophase. The thermal stability of the mesophase exhibited by the Li complexes based on each triblock mol. increases with increasing salt concentration This behavior is attributed to the dynamics of ionic association resulting from specific interactions between the ether oxygens and the cations. These results, characterized by a combination of techniques consisting of differential scanning calorimetry, thermal optical microscopy, and Raman spectroscopy, are discussed.

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Synthetic Route of 50670-76-3.

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

Lee, Myongsoo published the artcileHydrogen-Bonding-Mediated Formation of Supramolecular Rod-Coil Copolymers Exhibiting Hexagonal Columnar and Bicontinuous Cubic Liquid Crystalline Assemblies, HPLC of Formula: 50670-76-3, the publication is Macromolecules (1999), 32(25), 8531-8537, database is CAplus.

The preparation and characterization of the supramol. rod-coil copolymers directed by mol. recognition of 4,4′-bipyridine and 4-[poly(propyleneoxy)propyloxy]-4′-bis(biphenyl carboxylic acid) with d.p. of poly(propylene oxide) coil of eight (P-8-HP), 10 (P-10-HP), 15 (P-15-HP), 17 (P-17-HP), 21 (P-21-HP), 27 (P-27-HP) and 34 (P-34-HP) are described. The introduction of poly(propylene oxide) (PPO) coils with different lengths into the rodlike polymeric system induces a rich variety of self-assembled microstructures. In the crystalline phase, the supramol. rod-coil copolymers with DP of PPO 8-17 organize into a microphase-separated monolayer lamellar structure. In contrast, the supramol. rod-coil copolymers with DP of PPO 21-34 exhibit a hexagonal columnar crystalline phase. A dramatic phase change after crystalline melting of the polymers is observed with the variation of the coil length. The supramol. rod-coil copolymers P-8-HP and P-10-HP display a bicontinuous cubic mesophase with Ia3d symmetry, while the supramol. rod-coil copolymers P-15-HP, P-17-HP, and P-21-HP with a medium length of PPO coil exhibit a hexagonal columnar mesophase. Further increasing the length of coil, as in the case of P-27-HP and P-34-HP, suppresses liquid crystallinity and induces only crystalline polymers.

Macromolecules published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, HPLC of Formula: 50670-76-3.

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

Choi, E-Joon published the artcileDimesogenic compounds with chiral tails. Synthesis and liquid crystalline properties of a homologous series of α,ω-bis[4-(4′-(S)-(-)-2-methylbutoxycarbonyl-biphenyl-4-oxycarbonyl)phenoxy]alkanes, COA of Formula: C15H14O3, the publication is Bulletin of the Korean Chemical Society (2000), 21(1), 110-117, database is CAplus.

A series of new liquid crystalline dimesogenic compounds with chiral tails was synthesized, and their thermal and liquid crystalline properties were studied. The chain length of the central polymethylene spacers (x) was varied from dimethylene (2) to decamethylene (12). These compounds were characterized by elemental anal., IR and NMR spectroscopy, differential scanning calorimetry (DSC), and cross-polarizing microscopy. All compounds were found to be enantiotropically liquid crystalline, and the values of melting (T_m) and isotropization temperature (T_i) as well as enthalpy change (ΔH_i) and entropy change for isotropization (ΔS_i) decreased in a zig-zag fashion revealing the so-called odd-even effect as x increases. Their mesomorphic properties fall into 3 categories depending upon x; (a) compounds with x = 2 and 4 formed two different mesophases, smectic and cholesteric phases in that order on heating, and vice versa on cooling, (b) compounds with x = 3, 7, 8, 10, and 11 reversibly formed only the cholesteric phase, and (c) compounds with x = 5, 6, 9, and 12 exhibited only a cholesteric phase on heating, whereas on cooling they formed 2 different mesophases, cholesteric and smectic phases, sequentially.

Bulletin of the Korean Chemical Society published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, COA of Formula: C15H14O3.

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

Meesin, Jatuporn published the artcileDimerization of 3-Chlorooxindoles Mediated by Potassium Ethylxanthate: Synthesis of Isoindigos, Application In Synthesis of 3052-61-7, the publication is Synlett (2022), 33(14), 1317-1322, database is CAplus.

A novel dimerization of 3-chlorooxindoles I (R¹ = H, 5-Br, 5-Me, 6-Cl, 7-F, etc., R² = H; R¹ = H, R² = Me, H₂C:CHCH₂, PhCH₂) promoted by potassium ethylxanthate to access isoindigo derivatives II is described. The reactions proceeded readily at room temperature in short reaction times. A mechanistic study revealed that the 3-chlorooxindole is initially converted into O-Et S-(2-oxo-2,3-dihydro-1 H-indol-3-yl) dithiocarbonate, which subsequently undergoes dimerization with elimination of carbon disulfide. In almost all cases, anal. pure isoindigos II were isolated in moderate to good yields without a requirement for chromatog. purification

Synlett published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, Application In Synthesis of 3052-61-7.

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

Moad, Graeme published the artcileLiving free radical polymerization with reversible addition – fragmentation chain transfer (the life of RAFT), Product Details of C12H17NS2, the publication is Polymer International (2000), 49(9), 993-1001, database is CAplus.

Free radical polymerization with reversible addition-fragmentation chain transfer (RAFT polymerization) is discussed with a view to answering the following questions: (a) How living is RAFT polymerization. (b) What controls the activity of thiocarbonylthio compounds in RAFT polymerization. (c) How do rates of polymerization differ from those of conventional radical polymerization. (d) Can RAFT agents be used in emulsion polymerization. Retardation, observed when high concentrations of certain RAFT agents are used and in the early stages of emulsion polymerization, and how to overcome it by appropriate choice of reaction conditions, are considered in detail. Examples of the use of thiocarbonylthio RAFT agents in emulsion and miniemulsion polymerization are provided.

Polymer International published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, Product Details of C12H17NS2.

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

Bai, Feng published the artcileSynthesis and Characterization of Isoregic Chiral Smectic Polyesters, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Chemistry of Materials (1999), 11(7), 1666-1671, database is CAplus.

We prepared a series of isoregic chiral smectic polyesters based on (R)-(-)-4′-{ω-[2-(p-hydroxy-o-nitrophenyloxy)-1-propoxy]-1-alkyloxy}-4-biphenylcarboxylic acid. The head-to-tail (p-hydroxybenzoic acid) type monomers enable us to proceed the isoregically controlled polycondensation. All the monomers exhibited the chiral smectic C and nematic mesophases. The isoregic chiral smectic polyesters have good thermal stability and exhibit monolayered chiral smectic C and smectic A structures.

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

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

Reed, D. W. published the artcileAttraction of moth species of Tortricidae, Gelechiidae, Geometridae, Drepanidae, Pyralidae, and Gracillariidae families to field traps baited with conjugated dienes, Synthetic Route of 16974-11-1, the publication is Journal of Chemical Ecology (1985), 11(12), 1645-57, database is CAplus and MEDLINE.

Field surveys of a series of conjugated diunsatd. straight-chain primary alcs., acetates, and aldehydes (dienes), including the 3,5-dodecadienyl, 8,10-dodecadienyl, 3,5-tetradecadienyl, 8,10-tetradecadienyl, 9,11-tetradecadienyl, and 10,12-tetradecadienyl primary alcs., acetates, and most aldehydes, and the related monounsaturated straight-chain primary alcs., acetates, and aldehydes (monoenes), including the 3-dodecadienyl alc. and acetates, attracted various insect species of title families. Diene attractants have been demonstrated for â‰? Phyllonorycter sp., Chionodes lugubrella, Leptostales ferruminaria, Drepana bilineata, Pyrausta fodinalis, Notocelia purpurissatana, and Phaneta alterana. Monoene attractants were demonstrated for Hedya separatana, Cydia fletcherana, Barbara mappana, Ancylis burgessiana, A. nubeculana, Evippe prunifoliella, Phlyctaenia coronata tertialis, a Chionodes sp., a Gelechiidae sp., and an unidentified Phyllonorycter sp. Replicated field experiments showed attraction-inhibition relationships for most species. Electroantennagram data are presented for L. ferruminaria and D. bilineata.

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, Synthetic Route of 16974-11-1.

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