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The Meerwein–Ponndorf–Verley (MPV) reduction in organic chemistry is the reduction of ketones and aldehydes to their corresponding alcohols utilizing aluminium alkoxide catalysis in the presence of a sacrificial alcohol. [1] The advantages of the MPV reduction lie in its high chemoselectivity and its use of a cheap environmentally friendly ...
Since the office was established in 1789, 45 men have served in 46 presidencies. The first president, George Washington, won a unanimous vote of the Electoral College. [4] Grover Cleveland served two non-consecutive terms and is therefore counted as the 22nd and 24th president of the United States, giving rise to the discrepancy between the ...
The 2022 Siena poll had Franklin Roosevelt first, Lincoln second, and Washington third, with the bottom three as Trump, Buchanan, and Johnson. The 2021 C-SPAN poll showed a continued recent rehabilitation of Ulysses Grant, showed George W. Bush improving, Obama remaining high, and Trump with the fourth lowest ranking.
Eagle's minimal essential medium. Minimal essential medium (MEM) is a synthetic cell culture medium developed by Harry Eagle first published in 1959 [1] in Science that can be used to maintain cells in tissue culture. It is based on 6 salts and glucose described in Earle's salts in 1934: (calcium chloride, potassium chloride, magnesium sulfate ...
2-Methoxyethoxymethyl chloride is an organic compound with formula CH3OCH2CH2OCH2Cl. A colorless liquid, it is classified as a chloroalkyl ether. It is used as an alkylating agent. In organic synthesis, it is used for introducing the methoxyethoxy ether (MEM) protecting group. [2] MEM protecting groups are generally preferred to methoxymethyl ...
Memoization. In computing, memoization or memoisation is an optimization technique used primarily to speed up computer programs by storing the results of expensive function calls to pure functions and returning the cached result when the same inputs occur again.
A memristor (/ ˈ m ɛ m r ɪ s t ər /; a portmanteau of memory resistor) is a non-linear two-terminal electrical component relating electric charge and magnetic flux linkage.It was described and named in 1971 by Leon Chua, completing a theoretical quartet of fundamental electrical components which also comprises the resistor, capacitor and inductor.
RXNO:0000498. The Béchamp reduction (or Béchamp process) is a chemical reaction that converts aromatic nitro compounds to their corresponding anilines using iron as the reductant: [1] 4 C6H5NO2 + 9 Fe + 4 H2O → 4 C6H5NH2 + 3 Fe3O4. This reaction was once a major route to aniline, but catalytic hydrogenation is the preferred method.