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A Study of the Paterson Boron Aldol Reaction as Used in the Large-Scale Total Synthesis of the Anticancer Marine Natural Product (+)-Discodermolide
This white paper note discusses an optimization study of a key reagent controlled enantioselective boron enolate aldol reaction forming the C6-C7 bond and the C7 hydroxyl-bearing stereocenter in (+)-discodermolide. Conditions were found which increased the yield, decreased the excess of enolate necessary, and increased product stability with respect to the...
A Simple Mathematical Model for the Cooperative and Competitive Substituent Effects Found in the Cope Rearrangements of Phenyl-Substituted 1, 5-Hexadienes
A simple mathematical model is derived for the dependence of the substituent effects in the Cope rearrangements of substituted 1, 5-hexadienes on the interallylic bond lengths in the transition structures. The model qualitatively reproduces the cooperative substituent effects that have been found in the Cope rearrangements of 2, 5-diphenyl- and...
Use of Operating Windows in the Assessment of Integrated Robotic Systems for the Measurement of Bioprocess Kinetics
This study examines the utility of an automated liquid handling robot integrated with a microwell plate reader to enable the rapid acquisition of bioprocess kinetic data. The relationship between the key parameters for liquid handling accuracy and precision and the sample detection period has been characterized for typical low and...
Use of Block Hessians for the Optimization of Molecular Geometries
The block Hessian matrix is constructed by mixing a small critical block of the accurate Hessian for key atoms involved in bond breaking and forming with large noncritical blocks of the lowlevel Hessian. The block Hessian strategy efficiently removed the pathological effects of using low-level Hessians, and therefore it provides...
A Blue Dye for Substrate Tagging in the Two-Color Screening of Combinatorial Libraries
Split-and-mix combinatorial chemistry has made important contributions to the study of molecular recognition. In systems for which fully rational design is unrealistic, the method allows large libraries of potential receptors or substrates to be tested in parallel. Screening is typically visual, employing colored targets that concentrate in beads bearing the...
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Calcium Might Have Taste Humans Can Detect
It may be time to add calcium to the types of tastes -- sweet, sour, salty, bitter and savory -- that can be detected by humans, according to U.S. researchers. They found that a taste for calcium exists in mice. Since mice and humans share many of the same genes,...
New, potentially damaging, pollutant is discovered
A previously unknown class of pollutants, formed in combustion ranging from cigarettes to power plants and diesel engines, was announced at the American Chemical Society's national meeting. Whether they are harmful to human health is unknown, although the chemist who discovered the particles said their existence might help explain why...
More Juices Found to Affect Drugs' Effectiveness: Study
Grapefruit juice, long known to boost the absorption of certain medications, isn't the only juice that doesn't mix well with drugs, according to the Canadian researcher who first identified the ill effects of grapefruit juice. Other common juices, including orange and apple, may limit the body's absorption of drugs, compromising...
The Merck Index Women in Chemistry Scholarships to be Presented at American Chemical Society National Meeting
WHITEHOUSE STATION, N.J. -- Merck & Co. Inc. today announced the winners of the second annual Merck Index Women in Chemistry Scholarship program. The program is designed to foster support for women choosing to pursue advanced degrees in medicinal or synthetic organic chemistry. "We are pleased to be...
A Hope: Contaminant-Free Synthetic Heparin
Robert J. Linhardt is a chemist with a dream: making the blood-thinner heparin by the bucketful without using animal tissue. pig intestines processed in China. That processing often is done in small mom-and-pop workshops, a situation conducive to contamination, said Linhardt, a professor of chemistry, biology and chemical engineering at...
New Realities in Corporate PR
Caution - smoke filled rooms may be dangerous to your corporate health and wealth. So may even rooms that are entirely smoke-free, after the coming elections, if the rooms are occupied by legislators and aides deciding what government should do to make good on campaign promises. Two...
DSM Performance Materials Award 2008 presented to Professor Craig J. Hawker
Craig J. Hawker, Professor of Chemistry, Biochemistry and Materialsand Director of the Materials Research Laboratory at the Universityof California, Santa Barbara, USA, has been awarded the DSMPerformance Materials Award 2008 in recognition of his exceptionalcontributions to the advancement of the materials sciences. ProfessorHawker is one of the world's...
"Global Challenges/Chemistry Solutions" Debuts With Focus on Drinking Water
An authority on the quality of drinkingwater today describes new challenges for consumers and municipal watersupply systems, including unexpected consequences of efforts to conservewater, in the first of a special series of podcasts from the AmericanChemical Society ACS, the world's largest scientific society. Marc Edwards, Ph.D., notes that...
Pro-Pharmaceuticals' Executives Contribute to Definitive Book on Galectins
Pro-Pharmaceuticals' DAVANAT([R]) Targets Galectin Receptors on Cancer Cells NEWTON, Mass. -- Pro-Pharmaceuticals, Inc. (Amex: PRW), a Company developing proprietary carbohydrate-based therapeutic compounds to treat cancer and fibrosis, today announced two of its executives and a member of its Scientific Advisory Board edited a new book...
Spectrum Pharmaceuticals' Board of Directors Re-Elected at Annual Stockholders Meeting
IRVINE, Calif. -- Spectrum Pharmaceuticals, Inc. (NasdaqGM:SPPI) announced today that shareholders re-elected all six of the Company's nominees to the Board of Directors, with more than 88 percent of votes cast, at the Annual Meeting of Stockholders held on Friday, June 20, 2008 at the Company's global...
Small, but super: these 'atoms' can't leap tall buildings in a single bound, but they have special powers
Gold comes in many colors. Since ancient times, glass artists and alchemists alike have known how to grind the metal into fine particles that would take on hues such as red or mauve. At scales even smaller, clusters of just a few dozen atoms display even more...
Texterity Teams Up With SNAP to Help Launch the Digital Provider Marketplace
Texterity, a leading provider of digitalpublishing solutions, is among the first companies to join the new DigitalProvider Marketplace being created by the Society of National AssociationPublications SNAP. This Marketplace will offer first-hand informationabout digital publishing to SNAP members and will provide a handsome onlineshowcase to participating vendors. As...
Antiterrorism and homeland defense; polymers and materials
Antiterrorism and homeland defense; polymers and materials. Ed. by John G. Reynolds et al. American Chemical Society 2007 273 pages $145.00 Hardcover ACS symposium series; 980 UG447 The editors...
Multiscale simulation methods for nanomaterials
Multiscale simulation methods for nanomaterials. Ed. by Richard B. Ross and Sanat S. Mohanty. Wiley-Interscience 2008 275 pages $125.00 Hardcover TK7874 Large Scale Molecular Dynamics, Nanoscale, and Mesoscale Modeling and Simulation:...
Polymers for biomedical applications
Polymers for biomedical applications. Ed. by Anil Mahapatro and Ankur S. Kulshrestha. American Chemical Society 2008 420 pages $145.00 Hardcover ACS symposium series; 977 R857 Amongst the many materials...
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