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2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (or DDQ) is the chemical reagent with formula C 6 Cl 2 (CN) 2 O 2. This oxidant is useful for the dehydrogenation of alcohols, [3] phenols, [4] and steroid ketones. [5] DDQ decomposes in water, but is stable in aqueous mineral acid. [6]
The use of protective groups is pervasive but not without criticism. [103] In practical terms their use adds two steps (protection-deprotection sequence) to a synthesis, either or both of which can dramatically lower chemical yield. Crucially, added complexity impedes the use of synthetic total synthesis in drug discovery.
R = heteroatom, alkyl, aryl, allyl etc. or other substituents. In organic chemistry, benzyl is the substituent or molecular fragment possessing the structure R−CH 2 −C 6 H 5. Benzyl features a benzene ring (C 6 H 6) attached to a methylene group (−CH 2 −). [1]
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The first reported use of a PPG in the scientific literature was by Barltrop and Schofield, who in 1962 used 253.7 nm light to release glycine from N-benzylglycine. [4] Following this initial report, the field rapidly expanded throughout the 1970s as Kaplan [6] and Epstein [7] studied PPGs in a variety of biochemical systems. During this time ...
Scheme of solid-phase peptides synthesis (SPPS) on a resin as solid support with protected amino acids.The deprotection is usually done using a base such as piperidine.This is followed by a coupling step (a protected amino acid is added) to the growing peptide chain.
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2,2'-Dipyrromethene, often called just dipyrromethene or dipyrrin, is a chemical compound with formula C 9 H 8 N 2 whose skeleton can be described as two pyrrole rings C 5 N connected by a methyne bridge =CH– through their nitrogen-adjacent (position-2) carbons; the remaining bonds being satisfied by hydrogen atoms.