Weygand/Hilgetag Preparative Organic Chemistry
DR ANTHONY MELVIN CRASTO Ph.D ( ICT, Mumbai) , INDIA 30 Yrs Exp. in the feld of Organic Chemistry. Serving chemists around the world. Helping them with websites on Chemistry.Millions of hits on google, world acclamation from industry, academia, drug authorities for websites, blogs and educational contributionn
Thursday, 19 September 2013
Friday, 2 August 2013
- For the dry method, the column is first filled with dry stationary phase powder, followed by the addition of mobile phase, which is flushed through the column until it is completely wet, and from this point is never allowed to run dry.
- For the wet method, a slurry is prepared of the eluent with the stationary phase powder and then carefully poured into the column. Care must be taken to avoid air bubbles. A solution of the organic material is pipetted on top of the stationary phase. This layer is usually topped with a small layer of sand or with cotton or glass wool to protect the shape of the organic layer from the velocity of newly added eluent. Eluent is slowly passed through the column to advance the organic material. Often a spherical eluent reservoir or an eluent-filled and stoppered separating funnel is put on top of the column.
Mobile phase (eluent)
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Sunday, 28 July 2013
Friday, 26 July 2013
A concise synthesis of a novel alkaloid natural product with the pyrroloindoloquinazoline skeleton has been devised
Sunday, 21 July 2013
First total synthesis of fuscain
Department of Chemistry, Jinan University, Guangzhou 510632, P. R. China
Tuesday, 16 July 2013
Saturday, 13 July 2013
Friday, 12 July 2013
Turning carbon dioxide into something useful -Carbon dioxide reduced to formate by iridium pincer catalyst
New research shows that a water-soluble catalyst developed by scientists in the US can electrocatalytically transform carbon dioxide into a useful chemical feedstock.
The global demand for fuel is rising, as are carbon dioxide levels in the atmosphere. Recent studies have attempted to address the global carbon imbalance by exploring ways to recycle carbon dioxide into liquid fuels. Formate, the anion of formic acid, is an intermediate of carbon dioxide reduction and can be used as a fuel in formic acid fuel cells. However, the selective production of formate, without using organic solvents, is challenging. Water, being inexpensive and environmentally-friendly, is obviously preferred over organic solvents as a reaction medium. On the other hand, the reduction of carbon dioxide in water is complicated by the reduction of water to hydrogen being a more kinetically favourable process.
Friday, 5 July 2013
Continuous-flow Diels–Alder reactions with a homemade HPLC column give good selectivity for >150 h
Continuous-Flow Stereoselective Organocatalyzed Diels–Alder Reactions in a Chiral Catalytic "Homemade" HPLC Column
Valerio Chiroli, Maurizio Benaglia, Franco Cozzi, Alessandra Puglisi, Rita Annunziata, Giuseppe Celentano
Org. Letters 2013.
Thursday, 4 July 2013
The dual catalyst enables selective access to the required stereoisomer © Science/AAAS
Chemists from the Swiss Federal Institute of Technology, ETH Zurich, have teamed chiral catalysts in pairs to selectively drive a reaction towards desired stereoisomeric products with high selectivity. Each catalyst activates one reagent and controls its substituent arrangement as it bonds to the other to form two neighbouring chiral centres. ‘We have shown that it is possible to develop fully stereodivergent reaction processes,’ says Erick Carreira, who led the work. ‘We expect that additional reactions displaying full stereodivergency will be identified.’
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ReferencesS Krautwald et al, Science, 2013, DOI: 10.1126/science.1237068
Wednesday, 3 July 2013
Thursday, 27 June 2013
Harvard researchers have released a massive database of more than 2 million molecules that might be useful in the construction of solar cells that rely on organic compounds for construction of organic solar cells for the production of renewable energy. Developed as part of the Materials Genome Initiative launched by the White House’s Office of … more…
Monday, 24 June 2013
Natural Products from St. John's WortEnatiomers (−)-hyperione A and (−)-hyperione B can be synthesised from a common precursor in ten steps
Wednesday, 19 June 2013
Cheap nickel catalysis offers alternative to expensive enzymatic resolution, Switching chirality in amino acids
Cheap nickel catalysis offers alternative to expensive enzymatic resolution
Monday, 17 June 2013
Various approaches are available for improving the efficiency of analytical...
Tuesday, 11 June 2013
Chemist was the first to synthesize the cholesterol-lowering drug atorvastatin,
also known as Lipitor
The Society of Chemical Industry (SCI) has selected Bruce D. Roth, vice president of discovery chemistry at Genentech, as the winner of the 2013 Perkin Medal. The annual award is recognized as the highest honor given for outstanding work in applied chemistry in the U.S.
A Molecule Of Many Colors-With rigid wings and a flexible core, a new compound can switch between two shapes and glow one of three colors.
Flexible And Fluorescent
A molecule combining rigid anthraceneimide wings and a flexible
cyclooctatetraene core switches between a flat and a bent V shape. The R groups
are either hydrogens or n-butyl groups.
Credit: J. Am. Chem. Soc.
With rigid wings and a flexible core, a new compound can switch between two
shapes and glow one of three colors.
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Monday, 10 June 2013
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- Home ----Organic Reactions
Wednesday, 28 March 2012
DR ANTHONY MELVIN CRASTO Ph.D
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