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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...
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Rohm and Haas to Present New Findings in Rubber-to-Metal Bonding Technology
PHILADELPHIA -- Technical experts from specialty materials company Rohm and Haas (NYSE:ROH) will present new findings and introduce new products related to rubber-to-metal bonding at the upcoming 174th Technical Meeting and Rubber Mini Expo[TM]. The Expo is sponsored by the Rubber Division, American Chemical Society ACS and will be held...
Biothera Develops New Method for Analyzing Beta Glucan Structure
Presented at International Carbohydrate Symposium and American Chemical Society EAGAN, Minn. -- Biothera has developed a new analytical method to characterize a key structural attribute of beta 1,3/1,6 glucans, which will aid researchers developing this immune-enhancing carbohydrate for pharmaceutical applications. The method was presented recently to...
Better organic semiconductors
Researchers from Korea's Seoul National University SNU and the US National Institute of Standards and Technology NIST have learned how to tweak a new class of polymer-based semiconductors to better control the location and alignment of the components of the blend. Their recent findings, namely how to move...
50 Making a Difference profile: Elizabeth A. Nalley, Cameron
Those who can - do, and they also teach, at least if you're Dr. Elizabeth Nalley. Serving as a chemistry professor at Cameron University for the past 39 years is only the tip of the iceberg when it comes to Nalley's influence on past and future generations. ...
Protein Research Marketing Insights
ARLINGTON, Va., Sept. 23 /PRNewswire/ -- BioInformatics, LLC (http://www.gene2drug.com/), the leading market research and consulting firm serving the life science industry, announces the publication of its latest report, "Protein Research: Strategies for Marketing to Chemists and Biologists." A joint effort between BioInformatics, LLC and the American Chemical...
2008 Ad
PHILADELPHIA -- Rohm and Haas Company is accepting entries into its 2008 poster contest. The deadline for entries is Friday, Sept. 26. The theme of the contest, "Having a Ball With Chemistry" builds from the American Chemical Society's theme for its 2008 National Chemistry Week campaign. U.S. students...
Nanoparticles conspire with free radicals: dose of carcinogens could be comparable to smoking
PHILADELPHIA -- The daily exposure to free radicals from car exhaust, smokestacks and even your neighbors' barbecue could be as harmful as smoking, according to a new study. Many combustion processes, such as those in a car engine, create tiny particles that may act as brewing pots and carriers for...
Letters to the Editor
Supply, demand Re: "As chemists gather, let's refocus efforts to gain diversity in science," Tuesday: Catherine T. Hunt, past president of the American Chemical Society, plays a familiar refrain. Her message is that we need more students especially women and minority students to take up science, technology, engineering, and mathematics...
Albemarle Scientists Named 'Heroes of Chemistry'
BATON ROUGE, La., Aug. 21 /PRNewswire-FirstCall/ -- Twelve scientists from specialty chemical maker Albemarle Corporation and ExxonMobil Research and Engineering Company were honored by the American Chemical Society ACS in a special ceremony Sunday night as "Heroes of Chemistry" for their work in the development of NEBULAR...
Spoonful of Sugar Really Might Help Medicine Go Down
If your child won't take medicine and shuns broccoli at the dinner table, his body may just be hard-wired to respond that way. "Kids reject the bad taste of medicine, because it's basic biology. Their system is designed to reject that taste, because many toxic substances are bitter and distasteful,"...
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,...
Modified MRI Spots Early Osteoarthritis
A modified form of MRI may help diagnosis osteoarthritis at an early stage when it may be possible to prevent or reduce permanent joint damage, say U.S. researchers. Current diagnostic methods don't detect osteoarthritis until it's in advanced stages. In this new approach, MRI is used to determine the concentration...
Scientists identify chemical odor of skin cancer: study
WASHINGTON AFP — US chemists have identified the odor that emanates from skin cancer, a development that researchers hope will advance diagnosis and treatment of the deadly disease, said a study out Wednesday. The creation of a "profile" of the chemical odors linked to skin cancer, may lead...
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...
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Professional Organizations: 813920
