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  2. Barton reaction - Wikipedia

    en.wikipedia.org/wiki/Barton_reaction

    The unusual alkyl nitrite starting material of the Barton reaction is prepared by attack of an alcohol on a nitrosylium cation generated in situ by dehydration of doubly protonated nitrous acid. [6] This series of steps is mechanistically identical to the first half of the mechanism formation of the more well-known aryl and alkyl diazonium salts .

  3. Acid-fastness - Wikipedia

    en.wikipedia.org/wiki/Acid-fastness

    Mycobacterium tuberculosis (stained red) in tissue (blue).. Acid-fastness is a physical property of certain bacterial and eukaryotic cells, as well as some sub-cellular structures, specifically their resistance to decolorization by acids during laboratory staining procedures.

  4. Nitration - Wikipedia

    en.wikipedia.org/wiki/Nitration

    In organic chemistry, nitration is a general class of chemical processes for the introduction of a nitro group (−NO 2) into an organic compound.The term also is applied incorrectly to the different process of forming nitrate esters (−ONO 2) between alcohols and nitric acid (as occurs in the synthesis of nitroglycerin).

  5. Reactivity series - Wikipedia

    en.wikipedia.org/wiki/Reactivity_series

    In chemistry, a reactivity series (or reactivity series of elements) is an empirical, calculated, and structurally analytical progression [1] of a series of metals, arranged by their "reactivity" from highest to lowest.

  6. Nancy Pelosi undergoes hip replacement surgery after fall in ...

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    Democratic Rep. Nancy Pelosi, 84, underwent a successful hip replacement surgery after falling while in Luxembourg with a congressional delegation, her office said Saturday. "Earlier this morning ...

  7. Puzzle solutions for Tuesday, Nov. 26, 2024

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    SUDOKU. Play the USA TODAY Sudoku Game.. JUMBLE. Jumbles: SWOON WOULD BUFFET COSTLY. Answer: Grandpa kangaroo couldn’t jump the fence to get his ball because he was — OUT OF BOUNDS

  8. Research Shows Food Comas Are Real — and They Do More Than ...

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    Gifts, Christmas carols, seasonal decorations, and mulled wine are all great, but is there really anything better about the holidays than the abundant freedom to nap? Picture this: you have the ...

  9. List of alchemical substances - Wikipedia

    en.wikipedia.org/wiki/List_of_alchemical_substances

    Sal petrae (Med. Latin: "stone salt")/salt of petra/saltpetre/nitrate of potash – potassium nitrate, KNO 3, typically mined from covered dungheaps. Salt/common salt – a mineral, sodium chloride, NaCl, formed by evaporating seawater (impure form). Salt of tartar – potassium carbonate; also called potash.