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Welcome to ChemNews!
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Our May ChemNews showcases over 40 brand NEW and innovative products for Catalysis and other new building blocks and reagents. In addition, we're featuring the latest literature for chemical synthesis available from Sigma-Aldrich, as well our latest product highlights — all easily accessed from one convenient location.
Make sure you subscribe to ChemNews — all ChemNews subscribers can download quarterly pdf and sdf files that contain all the new products added during the year.
Check out the categories to the right and click on the links to view the latest products in that category.
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New Products
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NEW! Cheminar 3.2
Formation of C–C Bonds via Catalytic Hydrogenation
New Cross-Coupling Application Portal
See our comprehensive portfolio of catalysts, reagents and reactants for cross-coupling compiled in a series of ChemFiles, Technology Highlights and ChemBlogs featuring examples of applications using these products.
ortho-Bromo- and ortho-Iodophenylboronic Acids—Remarkable Organocatalysts for the Mild and Atom-Economical, Direct Amidation and Diels–Alder Reactions
Dennis Hall and co-workers have recently disclosed the remarkable ability of ortho-bromo- and ortho-iodophenylboronic acids, [2-BrC6H4B(OH)2] and [2-IC6H4B(OH)2], to catalyze the direct amidation of free carboxylic acids with amines and the Diels–Alder reaction of free alpha,beta-unsaturated carboxylic acids with simple dienes. The noteworthy features of this discovery are:
- 2-BrC6H4B(OH)2 and 2-IC6H4B(OH)2 are better catalysts for the direct amidation than the hitherto most efficient catalyst for the reaction, namely 3,4,5 F3C6H2B(OH)2.
- Both reactions take place at room temperature in an atom-economical, byproduct-free fashion.
- Both are operationally simple affording the pure products after a simple filtration and acid–base extractions (no chromatographic separations required).
- The boronic acid catalyst is recovered from the basic aqueous phase in high yield.
- The direct amidation reaction is broad in scope, and the Diels–Alder reaction remarkably selective.
- The two reactions can be combined in an efficient, one-pot, two-step cascade sequence that is promoted by a single catalyst. Read More
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NEW Palladium Catalysts
NEW Phosphines and Phosphine Precursors
Other NEW Catalysts
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696668
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685631
Mild coupling and cyclization catalyst. |
685046
Useful catalyst for deuterium labeling. |
696277
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697575
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696307
Multipurpose catalyst useful in reductions, carbene transfer reactions, aziridinations, and methyleneations. |
696250
Efficient precatalysts for hydrosililation of carbonyl compounds
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696242
Efficient precatalysts for hydrosililation of carbonyl compounds
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NEW Alkynes and Allenes
NEW Boron Reagents for Suzuki Coupling
NEW Aldehydes
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A-Phos Palladium Complexes for Efficient Suzuki Coupling
Click Here for more product highlights.
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