Month: November 2022

Charmillot, P. J. published the artcileThe influence of sex gland components on mating by the summerfruit tortrix moth, Adoxophyes orana, in the laboratory, Formula: C14H26O2, the publication is Entomologia Experimentalis et Applicata (1985), 39(3), 233-9, database is CAplus.

Couples of A. orana were isolated for 1 wk in small 1.25 L rearing boxes in the laboratory with sex gland components deposited on rubber caps. At the end of the trails females were dissected and spermatophores counted. Reduction of mating increased with the dose of a mixture of the attractant components Z-9-tetradecenyl acetate  [16725-53-4] and Z-11-tetradecenyl acetate  [20711-10-8] (9:1), but decreased with increasing d. of 1-5, 10 and 20 couples per box. Each of the attractant components alone produced a mating inhibition equal to the mixture The minor components Z-9-dodecenyl acetate  [16974-11-1] and dodecyl acetate  [112-66-3] had approx. the same effect as the main components, but tetradecyl acetate  [638-59-5] and Z-11-tetradecenyl alc.  [34010-15-6] had no effect. Identical trials conducted on a strain of summerfruit moth newly introduced to rearing showed that 10 times less product was needed to achieve the same degree of mating inhibition as with the old strain. With adaptation to laboratory conditions the proportion of unmated females diminished and repeated matings occurred more frequently. To achieve meaningful results one must work with material from regularly renewed rearings, or better with the direct descendants of individuals from orchards. The results are discussed in relation to mating disruption of A. orana in orchards.

Entomologia Experimentalis et Applicata 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, Formula: C14H26O2.

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

Triquet, Juliette published the artcileChemical surface densification of hardwood through lateral monomer impregnation and in situ EB polymerization, Part II: effect of irradiation dose on hardness, wood chemistry and polymer conversion, Recommanded Product: Trimethylolpropane triacrylate, the publication is Journal of Materials Science (2022), 57(12), 6656-6668, database is CAplus.

Surface chem. densification was recently introduced as a low cost and fast process to improve surface hardness of wood. The asym. d. profile at the surface due to polymer filled cells was achieved through unilateral impregnation of monomers and their fast in situ polymerization under electron beam radiations. This study investigates the effect of electron beam dose on the newly developed material in order to optimize and increase the performances. Effect of doses from 25 to 125 kGy on wood and polymer in situ were investigated by FTIR spectroscopy, confocal Raman microscopy and GC-MS quantification of extracted residual monomers. Brinell hardness of irradiated controls decreased with increased dose while it remained unchanged for densified samples. The effect of 25 kGy on the irradiated wood controls was insignificant, but evidence of cellulose depolymerization and decrease of hydrogen bonds strength was found at higher dose through FTIR anal. Raman investigation of the acrylate conversion in situ showed that most of the polymerization was achieved with 25 kGy. Residual monomers were still present in the wood samples up to 100 kGy. Thus, 25 kGy was sufficient to polymerize monomers in situ and increase Brinell hardness of densified wood while avoiding degradation of wood. However, 100 kGy was necessary to ensure highest conversion and no residual monomers. This study is opening perspectives on radiation effects on wood for optimal materials development.

Journal of Materials Science published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C20H12N2O2, Recommanded Product: Trimethylolpropane triacrylate.

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

Guivisdalsky, Pedro N. published the artcileGlycidyl derivatives as chiral C₃ synthons. Ring opening catalyzed by boron trifluoride etherate, Quality Control of 115314-17-5, the publication is Journal of the American Chemical Society (1989), 111(8), 3077-9, database is CAplus.

The BF₃.OEt₂ mediated regio- and stereoselective opening reactions of (R)- and (S)-glycidyl arenesulfonates I (R = 4-MeC₆H₅SO₂, 3-O₂NC₆H₄SO₂) and tert-butyldiphenylsilyl ether I (R = Me₃CPh₂Si) with R¹XH [R¹ = PhCH₂, Me(CH)₁₅, oleyl, petroselinyl, X = O; R¹ = Ph, X = S] in CH₂Cl₂ or CHCl₃ is reported. BF₃.Et₂ was a more effective catalyst than other Lewis acids used previously for opening of glycidol, giving rise to (+)- and (-)-ROCH₂CH(OH)CH₂XR¹ (R, R¹, X = same as above) in good yield and high enantiomeric excess. Glycidyl arenesulfonates underwent attack exclusively at C(3), whereas the silyl ethers gave products resulting from C(3):C(2) attack in a ratio of 9:1. The BF₃.Et₂O catalyzed opening of glycidyl derivatives is a more convenient method for preparing suitably protected vic-diols than the previously described Ti-mediated opening the the parent glycidol.

Journal of the American Chemical Society published new progress about 115314-17-5. 115314-17-5 belongs to esters-buliding-blocks, auxiliary class Epoxides,Chiral,Nitro Compound,Sulfonate,Benzene, name is (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, and the molecular formula is C9H9NO6S, Quality Control of 115314-17-5.

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

Guivisdalsky, Pedro N. published the artcileAn efficient stereocontrolled route to both enantiomers of platelet activating factor and analogs with long-chain esters at C-2: saturated and unsaturated ether glycerolipids by opening of glycidyl arenesulfonates, Name: (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, the publication is Journal of Organic Chemistry (1989), 54(19), 4643-8, database is CAplus.

Both enantiomers of various ether/ester glycerophosphocholines (R)-I and (S)-II (R¹ = e.g., hexadecyl, R² = pentadecyl, Me), including platelet activating factor I (R¹ = hexadecyl, R² = Me), were synthesized from arenesulfonate derivatives of glycidol (R)- and (S)-III (R³ = C₆H₄Me-4, C₆H₄NO₂-3) readily available in high enantiomeric purity. Regio- and stereospecific opening of (R)- or (S)-III with 1.0-1.4 equiv of long-chain saturated or unsaturated alc. using BF₃.Et₂O as catalyst in CH₂Cl₂ or CHCl₃ afforded (R)- and (S)-R³SO₃CH₂CH(OH)CH₂OR⁴ (IV; R³ = C₆H₄Me-4, C₆H₄NO₂-3; R⁴ = oleyl, petroselinyl, hexadecyl) in 73-83% yields and with the same very high optical purity of the parent glycidyl arenesulfonate (94-99% enantiomeric excess). For saturated alkyl/acyl I and II O-benzylation of IV was achieved with retention of the arenesulfonte group by using benzyl trifluoromethanesulfonate in the presence of excess 2,6-di-tert-butyl-4-methylpyridine; the C-2 hydroxyl of unsaturated O-alkyl IV is protected as the methoxymethyl ether under mild conditions in which the arenesulfonate group is retained. Displacement of the arenesulfonate group and introduction of the phosphocholine group to produce PAF analogs complete this route to chiral ether-ester phospholipids.

Journal of Organic Chemistry published new progress about 115314-17-5. 115314-17-5 belongs to esters-buliding-blocks, auxiliary class Epoxides,Chiral,Nitro Compound,Sulfonate,Benzene, name is (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, and the molecular formula is C9H9NO6S, Name: (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate.

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

Egly, Julien published the artcileCopper(I) complexes with remotely functionalized phosphine ligands: Synthesis, structural variety, photophysics and effect onto the optical properties, SDS of cas: 617-52-7, the publication is Inorganica Chimica Acta (2021), 119971, database is CAplus.

The synthesis, chem. and photophys. investigation of a series of eight novel copper-halide derivatives with different nuclearity is herein presented. One mononuclear copper(I) complex with formula [CuI(pyridine)(P)₂], where P is a functionalized phosphine, six dinuclear derivatives bearing the rhombic {Cu₂I₂} subunits and with general formula [Cu(μ-I)(P)(N)]₂ (N = pyridine, quinoline and 4-cyanopyridine) as well as one tetranuclear copper-iodide clusters of general formula [Cu(μ-I)P]₄ consisting of a cubane-like {Cu₄X₄} motif were straightforwardly prepared, also by mechano-chem. synthetic procedure. The phosphine ligands were prepared in excellent yield by using simple hydrophosphination reactions. For five of the investigated cuprous iodide derivatives their atom connectivity and solid-state crystalline packing was unambiguously confirmed by solving their single-crystal x-ray structure. All the investigated complexes resulted into photo- and thermally-stable luminescent species. In the solid state as microcrystalline powder samples, the complexes display intense photoluminescence ranging from the sky-blue to orange-red portion of the spectrum with PLQY values of 0.28-0.50 and 0.34-0.97 at room and low (77 K) temperature, resp., depending on the nature of both the coordinated N-heteroaromatic ring and phosphine ligands. In spite of the remote location of the functionalization of the phosphine, profound effects are observed onto the solid-state emission properties highlighting the importance of microenvironment for the emitters in the aggregated phase.

Inorganica Chimica Acta published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C7H10O4, SDS of cas: 617-52-7.

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

Hoque, Emdadul Md published the artcileNoncovalent interactions in Ir-catalyzed C-H activation: L-shaped ligand for para-selective borylation of aromatic esters, Category: esters-buliding-blocks, the publication is Journal of the American Chemical Society (2017), 139(23), 7745-7748, database is CAplus and MEDLINE.

An efficient strategy for the para-selective C-H-borylation of aromatic esters is described, utilizing iridium(I) precatalyst [Ir(cod)(OMe)]₂ and an L-shaped ligand I (L1), which enables coordination of the iridium center through its bipyridine moiety and substrate coordination through 2-quinolinol hydrogen bond. For achieving high para-selectivity, a new catalytic system has been developed modifying the core structure of the bipyridine. It has been proposed that the L-shaped ligand is essential to recognize the functionality of the oxygen atom of the ester carbonyl group via noncovalent interaction, which provides an unprecedented controlling factor for para-selective C-H activation/borylation.

Journal of the American Chemical Society 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, Category: esters-buliding-blocks.

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

Sundh, Ulla Beckman published the artcileScientific opinion on Flavouring Group Evaluation 20, Revision 4 (FGE.20Rev4): benzyl alcohols, benzaldehydes, a related acetal, benzoic acids, and related esters from chemical groups 23 and 30, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is EFSA Journal (2012), 10(12), 2994, 140 pp., database is CAplus.

The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to evaluate 45 flavouring substances in the Flavouring Group Evaluation 20, Revision 4 (FGE.20Rev4), using the Procedure in Commission Regulation (EC) No 1565/2000. This revision 4 is made due to inclusion of four addnl. substances, o-, m- and p-tolualdehyde [FL no: 05.026, 05.028 and 05.029] and phenylmethyl 2-methyl-2-butenoate [FL no: 09.858]. None of the substances were considered to have genotoxic potential. The substances were evaluated through a stepwise approach (the Procedure) that integrates information on structure-activity relationships, intake from current uses, toxicol. threshold of concern, and available data on metabolism and toxicity. The Panel concluded that all the substances do not give rise to safety concerns at their levels of dietary intake, estimated on the basis of the MSDI approach. Besides the safety assessment of these flavouring substances, the specifications for the materials of commerce have also been considered. Adequate specifications including complete purity criteria and identity for the materials of commerce have been provided for all 45 candidate substances.

EFSA Journal 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 C10H15NO, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate.

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

Anadon, Arturo published the artcileFlavouring Group Evaluation 8, Revision 1 (FGE.08Rev1): aliphatic and alicyclic mono-, di-, tri-, and polysulphides with or without additional oxygenated functional groups from chemical groups 20 and 30, Computed Properties of 19788-49-9, the publication is EFSA Journal (2010), 8(7), 1021, 123 pp., database is CAplus.

The Scientific Panel on Food Contact Materials, Enzymes, Flavorings and Processing Aids has been requested to evaluate 66 flavoring substances in the Flavoring Group Evaluation 8, Revision 1 (FGE.08Rev1), using the Procedure as referred to in the Commission Regulation (EC) No 1565/2000. These 66 flavoring substances belong to chem. groups 20 and 30, Annex I of the Commission Regulation (EC) No 1565/2000. Generally, the candidate substances and supporting substances are expected to share common routes of absorption, distribution and metabolism, and exhibit similar toxicol. properties.

EFSA Journal published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Computed Properties of 19788-49-9.

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

Anadon, Arturo published the artcileScientific opinion on Flavouring Group Evaluation 20, Revision 3(FGE.20Rev3): benzyl alcohols, benzaldehydes, a related acetal, benzoic acids, and related esters from chemical groups 23 and 30, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is EFSA Journal (2011), 9(7), 2176, 136 pp., database is CAplus.

The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to consider in this revision 3 of Flavouring Group Evaluation 20, the SCF Opinion on benzoic acid. Furthermore information on stereoisomeric composition for two substances [FL-no: 06.104 and 09.570] and new information to support the re-allocation of the structural class for the candidate substance piperonyl alc. [FL-no: 02.205] has been submitted. The 41 flavouring substances in Flavouring Group Evaluation 20 were evaluated using the Procedure in Commission Regulation (EC) No 1565/2000. None of the substances were considered to have genotoxic potential. The substances were evaluated through a stepwise approach (the Procedure) that integrates information on structure-activity relationships, intake from current uses, toxicol. threshold of concern, and available data on metabolism and toxicity. The Panel concluded that all the substances do not give rise to safety concerns at their levels of dietary intake, estimated on the basis of the MSDI approach.

EFSA Journal 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

Anadon, Arturo published the artcileFlavouring Group Evaluation 8, Revision 2 (FGE.08Rev2): aliphatic and alicyclic mono-, di-, tri-, and polysulphides with or without additional oxygenated functional groups from chemical groups 20 and 30, Recommanded Product: Ethyl 2-mercaptopropanoate, the publication is EFSA Journal (2010), 8(11), 1408, 124 pp., database is CAplus.

The Scientific Panel on Food Contact Materials, Enzymes, Flavorings and Processing Aids has been requested to evaluate 67 flavoring substances in the Flavoring Group Evaluation 8, Revision 2 (FGE.08Rev2), using the Procedure as referred to in the Commission Regulation (EC) No 1565/2000. These 67 flavoring substances belong to chem. groups 20 and 30, Annex I of the Commission Regulation (EC) No 1565/2000. Final evaluation of the materials of commerce cannot be performed for 40 of the 67 substances, pending further information. The remaining 27 flavoring substances evaluated through the Procedure [FL-no: 12.096, 12.099,12.103, 12.111, 12.117, 12.124, 12.125, 12.127, 12.129, 12.136, 12.151, 12.152, 12.158, 12.165, 12.166, 12.181, 12.183, 12.189, 12.191, 12.196, 12.200, 12.205, 12.221, 12.277, 15.081, 15.103 and 15.111] would present no safety concern at the levels of intake estimated on the basis of the MSDI approach.

EFSA Journal published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Recommanded Product: Ethyl 2-mercaptopropanoate.

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