114838-32-3Relevant articles and documents
Synthesis of functionalised N-heterocyclic carbene ligands bearing a long spacer and their use in olefin metathesis
Kosnik, Wioletta,Grela, Karol
, p. 7463 - 7467 (2013/07/19)
A synthetic route to backbone functionalised imidazolinium salts - NHC ligand precursors has been developed. These tagged NHC ligands can be used to obtain a homogeneous Hoveyda-type catalyst (19) containing a quaternary ammonium group on a C-8 long spacer. Products of olefin metathesis reactions promoted by complex 19 can be readily purified from Ru-residues by filtration of the reaction mixture through a small amount of silica gel.
Maltoside and Phosphocholine Derivatives, Uses thereof and Methods of Preparing Artificial Lipid Structures Thereof
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Paragraph 0055, (2013/04/24)
Disclosed are saccharide and phosphocholine derivatives. The derivatives include azide and alkyne derivatives which form one end of a variable length carbon chain. The opposite end of the variable length carbon chain is covalently linked to the saccharide or phosphocholine. The saccharide may be, for instance, a maltoside. The alkyne and azide derivatives of the saccharides and phosphocholine may be reacted together to form amphiphilic molecules useful in cellular membrane studies and applications. By adjusting the length of the carbon chain, the biochemical and biophysical properties of the resultant 1,4-disubstituted 1,2,3-triazole compounds may be custom tailored for the intended application. Resultant molecules may form micelles, bicelle, lipid bilayers and other like structures useful in the isolation and purification of membrane bound or membrane associated proteins and biochemical components. The saccharides and phosphocholine molecules may be alternatively substituted as desired to provide additional flexibility in designing the desired end product.
Investigating inner-sphere reorganization via secondary kinetic isotope effects in the C-H cleavage reaction catalyzed by soybean lipoxygenase: Tunneling in the substrate backbone as well as the transferred hydrogen
Meyer, Matthew P.,Klinman, Judith P.
supporting information; experimental part, p. 430 - 439 (2011/04/16)
This work describes the application of NMR to the measurement of secondary deuterium (2° 2H) and carbon-13 (13C) kinetic isotope effects (KIEs) at positions 9-13 within the substrate linoleic acid (LA) of soybean lipoxygenase-1. The KIEs have been measured using LA labeled with either protium (11,11- h2-LA) or deuterium (11,11-d2-LA) at the reactive C11 position, which has been previously shown to yield a primary deuterium isotope effect of ca. 80. The conditions of measurement yield the intrinsic 2° 2H and 13C KIEs on kcat/Km directly for 11,11-d2-LA, whereas the values for the 2° 2H KIEs for 11,11-h2-LA are obtained after correction for a kinetic commitment. The pattern of the resulting 2° 2H and 13C isotope effects reveals values that lie far above those predicted from changes in local force constants. Additionally, many of the experimental values cannot be modeled by electronic effects, torsional strain, or the simple inclusion of a tunneling correction to the rate. Although previous studies have shown the importance of extensive tunneling for cleavage of the primary hydrogen at C11 of LA, the present findings can only be interpreted by extending the conclusion of nonclassical behavior to the secondary hydrogens and carbons that flank the position undergoing C-H bond cleavage. A quantum mechanical method introduced by Buhks et al. [J. Phys. Chem. 1981, 85, 3763] to model the inner-sphere reorganization that accompanies electron transfer has been shown to be able to reproduce the scale of the 2° 2H KIEs.
Synthesis of linoleic acids combinatorially labeled at the vinylic positions as substrates for lipoxygenases
Meyer, Matthew P.,Klinman, Judith P.
, p. 3600 - 3603 (2008/09/19)
Mammalian lipoxygenases have been implicated in a number of inflammation-related human diseases. Soybean lipoxygenase-1 is the archetypical example of known lipoxygenases. Here we report the synthesis of linoleic acid and (11,11)-d2-linoleic acid which are combinatorially labeled at the vinylic positions (9, 10, 12, and 13). Combinatorial labeling schemes allow for the simultaneous determination of KIEs in enzymatic reactions using NMR. Substrates are, thus, available as probes of detailed mechanism in kinetic isotope effect (KIE) studies of lipoxygenases.
Method to inhibit ethylene responses in plants
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Page/Page column 18, (2010/02/11)
The present invention generally relates to methods of inhibiting ethylene responses in plants and plant materials, and particularly relates to methods of inhibiting various ethylene responses including plant maturation and degradation, by exposing plants to cyclopropene derivatives and compositions thereof wherein: 1) at least one substituent on the cyclopropene ring contains a carbocyclic or heterocyclic ring, or 2) . a substituent contains silicon, sulfur, phosphorous, or boron, or 3) least one substituent contains from one to four non-hydrogen atoms and at least one substituent contains more than four non-hydrogen atoms.
Synthesis of all-trans-Parinaric Acid-d8 Specifically Deuterated at All Vinyl Positions
Goerger, Michael M.,Hudson, Bruce S.
, p. 3148 - 3153 (2007/10/02)
Parinaric acid is a widely used fluorescent probe of biological systems.The all-trans isomer (9(E),11(E),13(E),15(E)-octadecatetraenoic acid) specifically deuteriated at all vinyl positions was prepared by using the Wittig reaction to couple a diene phosphorane with an α,β-unsaturated aldehyde-ester.The preparation of each component included the stereoselective reduction of a substituted propynoic ester with lithium aluminum deuteride (LAD), introducing the trans double bond as well as most of the deuterium in one step, in high isotopic purity without unwanted hydrogen-deuterium exchange.By inclusion of deuterium, the probe can be used with other techniques, such as deuterium NMR and neutron diffraction, further increasing its utility.The synthesis can be used to prepare other tetraenes by correct choice of starting propynoic esters.
SYNTHESIS AND PHISIOLOGICAL ACTIVITIES OF BOTH ENANTIOMERS OF CORIOLIC ACID AND THEIR GEOMETRIC ISOMERS
Kobayashi, Yuichi,Okamoto, Sentaro,Shimazaki, Toshiyuki,Ochiai, Yoshinori,Sato, Fumie
, p. 3959 - 3962 (2007/10/02)
Both enantiomers of coriolic acid and their geometric isomers are synthesized highly selectively.These acids are found to exhibit similar inhibition activity toward spore germination of rice blast fungus.