منابع مشابه
Stereospecific synthesis of amphetamines
Regioselective addition of aryl lithium to commercially available (S)-(+)-propylene oxide provides the corresponding (S)-aryl-2-propanol. The (R)-amphetamine is obtained by conversion of the alcohol to the tosylate followed by azide displacement and hydrogenation. Mitsunobu conversion of the alcohol to the (R)-bromide followed by azide displacement and hydrogenation affords the (S)-amphetamine....
متن کاملPolypropylene Nanocomposites
Imagine an industrialist and his design team relatively aware of the developments in the research with nano-fillers asking themselves: What can we do with nano-composites and make a net profit up to the ‘promises’ of the current state of the art? Research announced potential areas of interest for practical applications include mechanical performance, toughness improvement, surface hardening, fi...
متن کاملStereospecific C6-hydroxyethylation of the penicillin nucleus.
Sir: Recent discoveries of potent jl-lactam antibiotics possessing a hydroxyethyl moiety instead of the usual amido side chain at C6 have stimulated the interest in synthetic methods for obtaining hydroxyethyl penicillanates.1) Convenient method for the preparation of 6-hydroxyethyl penicillanate by using metal-halogen exchange reaction was reported earlier by DININNO, et al.2) As an extension ...
متن کاملThe Highest - Energy Cosmic Rays
The unexpected discovery of the cosmic microwave background by Arno Penzias and Robert Wilson in 1965 is now the centerpiece of our understanding of the Big Bang and the subsequent evolution of the universe. (See PHYSICS TODAY, November 1997, page 32.) The discovery also set off something of a race to verify one of its implications for cosmic rays. In 1966, Kenneth Greisen (Cornell University) ...
متن کاملA Stereospecific Analysis of Triglycerides.
A method is presented for the analysis of the fatty acid compositions in each of the three positions of a triglyceride. Diglycerides are obtained from the triglyceride by lipolysis with pancreatic lipase, and converted to a mixture of Dand L-phosphatidyl phenol. The L-phosphatide is then hydrolyzed by phospholipase A, leaving a lysophosphatide with the fatty acid in position 1, free fatty acid ...
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ژورنال
عنوان ژورنال: Kobunshi
سال: 1996
ISSN: 0454-1138,2185-9825
DOI: 10.1295/kobunshi.45.480