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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.
p-Methoxybenzyl (PMB) is used as a protecting group for alcohols in organic synthesis (4-Methoxybenzylthiol is used to protect thiols). The p -methoxybenzyl group Strong base such as powdered potassium hydroxide or sodium hydride and p -methoxybenzyl halide (chloride or bromide) [ 14 ] [ 15 ]
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.
Intergovernmental risk pool is the use of the risk pool risk management technique commonly practiced by private insurance companies, but applied to public entities (e.g. made up of government agencies, school districts, county governments and municipalities) who come together to form a pool to provide protection against catastrophic risks such as floods or earthquakes.
Victor Mendoza, the president of a farming co-op near the sprawling Yanacocha gold mine in northern Peru, with his 10-year-old son. The mine, built two decades ago with the financial backing of the International Finance Corp., the private-lending arm of the World Bank, is deeply unpopular in this region.
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[1] [2] See Finance § Risk management for an overview. Financial risk management as a "science" can be said to have been born [3] with modern portfolio theory, particularly as initiated by Professor Harry Markowitz in 1952 with his article, "Portfolio Selection"; [4] see Mathematical finance § Risk and portfolio management: the P world.