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Showing 1-30 of 31 results for "295469" within Papers
The synthesis of S-(+)-2, 2-dimethylcyclopropane carboxylic acid: a precursor for cilastatin.
Wang Q, et al.
Tetrahedron Asymmetry, 9(22), 3971-3977 (1998)
Molybdenum (III) Compounds as Catalysts for 2?Methylpropene Polymerization.
Hijazi A K, et al.
Angewandte Chemie (International Edition in English), 46(38), 7290-7292 (2007)
The synthesis of S-(+)-2, 2-dimethylcyclopropane carboxylic acid: a precursor for cilastatin
Wang Q, et al.
Tetrahedron Asymmetry, 9, 3971-3977 (1998)
Jin-Zhou Zhu et al.
Biomaterials, 33(33), 8204-8212 (2012-08-18)
The presence of polymer coating on a coronary stent is a major mediator of coronary inflammation reaction thereby affects re-endothelialization. Poly(styrene-block-isobutylene-block-styrene) (SIBS) is one of the most attractive alternatives to serve as stent coating, but has shown less than optimal
Taichang Zhang et al.
The journal of physical chemistry. A, 112(42), 10495-10501 (2008-10-01)
The thermal decomposition pathways of MTBE have been investigated using the G3B3 method. On the basis of the experimental observation and theoretical calculation, the pyrolysis channels are provided, especially for primary pyrolysis reactions. The primary decomposition pathways include formation of
S Van den Velde et al.
Journal of dental research, 88(3), 285-289 (2009-03-31)
Previous studies have demonstrated that hydrogen sulfide and methyl mercaptan play a major role in oral malodor. In the present study, we tested the hypothesis that other compounds found in mouth air can also contribute to halitosis. Mouth air of
Victoria Volkis et al.
Journal of the American Chemical Society, 131(9), 3132-3133 (2009-02-14)
In the presence of LiCB(11)Me(12) catalyst and a nonoxidizing radical initiator, isobutylene undergoes radical chain polymerization in an inert solvent at ambient temperature and pressure to give a new highly branched form of polyisobutylene. Copolymerization with ethyl acrylate is also
Yoshihiro Kikkawa et al.
Organic & biomolecular chemistry, 10(40), 8087-8094 (2012-09-12)
A series of isobutenyl compounds possessing various alkyl chain lengths (C(n)-1) with a carbon number of n = 14-21 were synthesized and their two-dimensional (2D) structures were systematically studied using scanning tunnelling microscopy (STM) at a highly oriented pyrolytic graphite
Solvent?Ligated Copper (II) Complexes for the Homopolymerization of 2?Methylpropene.
Li Y, et al.
Chemistry (Weinheim An Der Bergstrasse, Germany), 14(26), 7997-8003 (2008)
David S Gogerty et al.
Applied and environmental microbiology, 76(24), 8004-8010 (2010-10-26)
Isobutene is an important commercial chemical used for the synthesis of butyl rubber, terephthalic acid, specialty chemicals, and a gasoline performance additive known as alkylate. Currently, isobutene is produced from petroleum and hence is nonrenewable. Here, we report that the
Katsuhiko Yoshizawa et al.
Toxicologic pathology, 33(5), 517-532 (2005-07-29)
Cardiac thrombosis, one of the causes of sudden death throughout the world, plays a principal role in several cardiovascular diseases, such as myocardial infarction and stroke in humans. Data from studies of induction of chemical thrombosis in rodents help to
C Franklin Goldsmith et al.
The journal of physical chemistry. A, 113(47), 13357-13371 (2009-07-25)
This work reports experimental and theoretical first-order rate constants for the reaction of vinyl radical with C(4)H(8) alkenes: 1-butene, 2-butene, and isobutene. The experiments are performed over a temperature range of 300 to 700 K at 100 Torr. Vinyl radicals
Hsing-Lung Lien et al.
Journal of hazardous materials, 144(1-2), 194-199 (2006-11-18)
A solid organic polymer, Nafion, is tested for the removal of methyl tert-butyl ether (MTBE) in water. Nafion with perfluorosulfonic acid backbone and terminal sulfonic acid groups has a surface acidity similar to 100% sulfuric acid, and has been commonly
Hongmei Zhao et al.
The journal of physical chemistry. A, 110(25), 7858-7866 (2006-06-23)
The reaction of O((3)P) with isobutene ((CH(3))(2)C=CH(2)) is investigated using the unrestricted second-order Møller-Plesset perturbation (UMP2) and complete basis set CBS-4M level methods. The minimum energy crossing point (MECP) between the singlet and triplet potential energy surfaces is located using
Junming Sun et al.
Journal of the American Chemical Society, 133(29), 11096-11099 (2011-06-21)
We report the design and synthesis of nanosized Zn(x)Zr(y)O(z) mixed oxides for direct and high-yield conversion of bio-ethanol to isobutene (~83%). ZnO is addded to ZrO(2) to selectively passivate zirconia's strong Lewis acidic sites and weaken Brönsted acidic sites, while
Francesco Frusteri et al.
Bioresource technology, 118, 350-358 (2012-06-19)
Etherification of glycerol (GLY) with isobutylene (IB) to produce biofuels was investigated in liquid phase using spherical silica supported Hyflon® catalysts (SSHC). As reference catalyst, Amberlyst® 15 (A-15) acid ion-exchange resin was used. Experiments were carried out in batch mode
Zdeněk Spáčil et al.
Journal of mass spectrometry : JMS, 46(10), 1089-1098 (2011-10-21)
Structures of tert-butylcarbamate ions in the gas-phase and methanol solution were studied for simple secondary and tertiary carbamates as well as for carbamate-containing products and internal standards for lysosomal enzyme assays used in newborn screening of a α-galactosidase A deficiency
Grant Copeland et al.
Physical chemistry chemical physics : PCCP, 13(39), 17461-17473 (2011-08-03)
The reactions of ozone with the alkenes 2,3-dimethyl 2-butene (DMB) and 2-methyl propene (2MP) have been investigated using a flow-tube interfaced to a u.v. photoelectron spectrometer. These reactions were studied at low pressure at different reagent partial pressures, both with
Jong-Ho Choi et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 7(12), 2526-2532 (2006-11-09)
The radical-radical reaction mechanisms and dynamics of ground-state atomic oxygen [O(3P)] with the saturated tert-butyl radical (t-C4H9) are investigated using the density functional method and the complete basis set model. Two distinctive reaction pathways are predicted to be in competition:
Fuat Bayrakçeken et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 67(5), 1276-1280 (2007-01-06)
The radicals formed in the flash photolysis of 2-methylbut-1-ene and subsequent reactions have been investigated by kinetic spectroscopy and gas liquid chromatography. Less than 10% of photo products are formed by a molecular made of fission of the excited olefin
Nicolas Cottenye et al.
Chemical communications (Cambridge, England), 48(20), 2615-2617 (2012-02-02)
The polymer modification of short nucleotide sequences has been achieved for future use as self-assembled biologically active structures with sizes in the nanometre range. Co-assembly of the resulting DNA-based amphiphilic block copolymers with native proteins demonstrates the self-assembly of biological-like
M Cornet et al.
Critical reviews in toxicology, 27(3), 223-232 (1997-05-01)
2-Methylpropene (MP) or isobutene is a gaseous chemical used on a large scale in the synthetic rubber industry. The present review covers the rather scarce literature on MP with respect to its metabolic fate and toxicity in laboratory animals and
Jiwen Li et al.
Se pu = Chinese journal of chromatography, 22(1), 81-83 (2005-02-17)
A capillary column HP-AlO2O3/S PLOT(50 m x 0.32 mm i.d. x 8 microm) has been used for the analysis of trace hydrocarbon impurities in high purity isobutene. The results showed that these hydrocarbon impurities could be well separated and with
Hongfu Yuan et al.
Applied spectroscopy, 61(1), 96-101 (2007-02-22)
The molar ratio between methanol and isobutylene (MRMI) is very important to the operation of methyl tertiary butyl ether (MTBE) production units. A new on-line near-infrared (NIR) analytical system was integrated for monitoring the MRMI in real time and was
Selective alkylation of p-xylene with 2-methylpropene by 12-tungstophosphoric acid.
Soeda H, et al.
Chemistry Letters (Jpn), 23(5), 909-912 (1994)
Markus Burkhardt et al.
Langmuir : the ACS journal of surfaces and colloids, 24(5), 1769-1777 (2008-01-30)
We report on interpolyelectrolyte complexes (IPECs) formed by micelles of ionic amphiphilic diblock copolymers with polyisobutylene (PIB) and poly(sodium methacrylate) (PMANa) blocks interacting with quaternized poly(4-vinylpyridine) (P4VPQ). The interpolyelectrolyte complexation was followed by turbidimetry and small angle neutron scattering (SANS).
Bianca N M van Leeuwen et al.
Applied microbiology and biotechnology, 93(4), 1377-1387 (2012-01-12)
Isobutene (2-methylpropene) is one of those chemicals for which bio-based production might replace the petrochemical production in the future. Currently, more than 10 million metric tons of isobutene are produced on a yearly basis. Even though bio-based production might also
Shouming Zhou et al.
The journal of physical chemistry. A, 110(23), 7386-7392 (2006-06-09)
Kinetic studies on the gas-phase reactions of OH and NO3 radicals and ozone with ethyl vinyl ether (EVE), propyl vinyl ether (PVE) and butyl vinyl ether (BVE) have been performed in a 405 L borosilicate glass chamber at 298 +/-
Eugene Beilin et al.
Journal of pharmaceutical and biomedical analysis, 52(2), 316-319 (2010-02-02)
During development of the residual solvent method using headspace-GC for a drug substance, an unexpected peak was observed in the chromatography. GC-MS analysis confirmed the unknown peak identity as isobutylene. An understanding of the source of the isobutylene was required
Cyril Vancura et al.
Analytical chemistry, 79(4), 1646-1654 (2007-02-15)
A novel resonant cantilever sensor system for liquid-phase applications is presented. The monolithic system consists of an array of four electromagnetically actuated cantilevers with transistor-based readout, an analog feedback circuit, and a digital interface. The biochemical sensor chip with a
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