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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.
It is also a good test for the successful deprotection of a secondary amine. Secondary amines react with chloranil to give a brown/red/orange derivative, the colour depending on the amine. In these reactions, the amine displaces chloride from the ring of the quinone.
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Over the last 20 years, research into the effects of specific drugs has become almost exclusively funded by drug companies that have an interest in the results. The government, through agencies such as the National Institutes of Health, sponsors generic research related to various diseases, but beyond that initial stage, most of the work is ...
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Spiders produce silk using special organs called spinnerets, located typically on the underside of their abdomen. They look a bit like an icing nozzle The 7 Types of Spider Webs and the Incredible ...
Andrey Rublev credited his mental approach after beating Jack Draper 7-5, 5-7, 6-1 to win the Qatar Open for the second time Saturday. It was Rublev’s third three-set win in three days. The ...