1569-60-4Relevant articles and documents
2,6,10-TRIMETHYL-7-(3-METHYLBUTYL)-DODECANE, A NOVEL SEDIMENTARY BIOLOGICAL MARKER COMPOUND.
Yon, D.A.,Maxwell, J.R.,Ryback, G.
, p. 2143 - 2146 (1982)
A C20 isoprenoid alkane (1) reported to occur in several recent sediments, has been isolated from Rozel Point crude oil and its structure confirmed by synthesis.
Essential oil of aristolochia trilobata: Synthesis, routes of exposure, acute toxicity, binary mixtures and behavioral effects on leaf-cutting ants
De Oliveira, Bruna Maria S.,Melo, Carlisson R.,Alves, Péricles B.,Santos, Abra?o A.,Santos, Ane Caroline C.,Santana, Alisson Da S.,Araújo, Ana Paula A.,Nascimento, Pedro E. S.,Blank, Arie F.,Bacci, Leandro
, (2017)
Plants of the genus Aristolochia have been frequently reported as important medicinal plants. Despite their high bioactive potential, to date, there are no reports of their effects on leaf-cutting ants. Therefore, the present study aimed to evaluate the insecticidal activity of the essential oil of Aristolochia trilobata and its major components on Atta sexdens and Acromyrmex balzani, two species of leaf-cutting ants. The bioassays were performed regarding routes of exposure, acute toxicity, binary mixtures of the major components and behavioral effects. Twenty-five components were identified in the essential oil of A. trilobata using a gas chromatographic system equipped with a mass spectrometer and a flame ionization detector. The components found in higher proportions were sulcatyl acetate, limonene, p-cymene and linalool. The essential oil of A. trilobata and its individual major components were efficient against A. balzani and A. sexdens workers when applied by fumigation. These components showed fast and efficient insecticidal activity on ants. The components acted synergistically and additively on A. balzani and A. sexdens, respectively, and caused a strong repellency/irritability in the ants. Thus, our results demonstrate the great potential of the essential oil of A. trilobata and its major components for the development of new insecticides.
Biocatalytic-Based Synthesis of Optically Pure (C-6)-Functionalized 1-(tert-Butyldimethylsilyloxy) 2-Methyl-(E)-2-heptenes
Liang, Shaowo,Paquette, Leo A.
, p. 445 - 452 (1990)
Controlled lipase hydrolysis of sulcatol chloroacetate at pH 7.2 to 55percent completion gives (R)-(-)-sulcatol of 89percent ee.Alkaline hydrolysis of the unreacted ester provides the (S)-(+) enantiomer efficiently and in an optically pure state.The latter is protected at its hydroxyl group, oxidized at its less sterically hindered terminal methyl group, and trans-formed into useful bifunctional reagents possessing 100percent ee.
Amino Acid-Functionalized Metal-Organic Frameworks for Asymmetric Base–Metal Catalysis
Newar, Rajashree,Akhtar, Naved,Antil, Neha,Kumar, Ajay,Shukla, Sakshi,Begum, Wahida,Manna, Kuntal
, p. 10964 - 10970 (2021/03/29)
We report a strategy to develop heterogeneous single-site enantioselective catalysts based on naturally occurring amino acids and earth-abundant metals for eco-friendly asymmetric catalysis. The grafting of amino acids within the pores of a metal-organic framework (MOF), followed by post-synthetic metalation with iron precursor, affords highly active and enantioselective (>99 % ee for 10 examples) catalysts for hydrosilylation and hydroboration of carbonyl compounds. Impressively, the MOF-Fe catalyst displayed high turnover numbers of up to 10 000 and was recycled and reused more than 15 times without diminishing the enantioselectivity. MOF-Fe displayed much higher activity and enantioselectivity than its homogeneous control catalyst, likely due to the formation of robust single-site catalyst in the MOF through site-isolation.
Benzimidazole fragment containing Mn-complex catalyzed hydrosilylation of ketones and nitriles
Ganguli, Kasturi,Mandal, Adarsha,Sarkar, Bidisha,Kundu, Sabuj
, (2020/08/13)
The synthesis of a new bidentate (NN)–Mn(I) complex is reported and its catalytic activity towards the reduction of ketones and nitriles is studied. On comparing the reactivity of various other Mn(I) complexes supported by benzimidazole ligand, it was observed that the Mn(I) complexes bearing 6-methylpyridine and benzimidazole fragments exhibited the highest catalytic activity towards monohydrosilylation of ketones and dihydrosilylation of nitriles. Using this protocol, a wide range of ketones were selectively reduced to the corresponding silyl ethers. In case of unsaturated ketones, the chemoselective reduction of carbonyl group over olefinic bonds was observed. Additionally, selective dihydrosilylation of several nitriles were also achieved using this complex. Mechanistic investigations with radical scavengers suggested the involvement of radical species during the catalytic reaction. Stoichiometric reaction of the Mn(I) complex with phenylsilane revealed the formation of a new Mn(I) complex.
