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  2. Pyrrole - Wikipedia

    en.wikipedia.org/wiki/Pyrrole

    Pyrrole is an extremely weak base for an amine, with a conjugate acid pK a of −3.8. The most thermodynamically stable pyrrolium cation (C 4 H 6 N +) is formed by protonation at the 2 position. Substitution of pyrrole with alkyl substituents provides a more basic molecule—for example, tetramethylpyrrole has a conjugate acid pK a of +3.7.

  3. Pyrrole-2-carboxylic acid - Wikipedia

    en.wikipedia.org/wiki/Pyrrole-2-carboxylic_acid

    Pyrrole-2-carboxylic acid is an organic compound with the formula HNC 4 H 3 CO 2 H. It is one of two monocarboxylic acids of pyrrole. It is a white solid. It arises in nature by dehydrogenation of the amino acid proline. [1] It also arises by carboxylation of pyrrole. [2] The ethyl ester of this acid is readily prepared from pyrrole. [3]

  4. Knorr pyrrole synthesis - Wikipedia

    en.wikipedia.org/wiki/Knorr_pyrrole_synthesis

    Dissolving Knorr's pyrrole in concentrated sulfuric acid, and then pouring the resulting solution into water will hydrolyze the 4-ester group selectively. The 5-methyl group can be variously oxidized to chloromethyl, aldehyde, or carboxylic acid functionality by the use of stoichiometric sulfuryl chloride in glacial acetic acid. [ 7 ]

  5. 1-Pyrroline-5-carboxylic acid - Wikipedia

    en.wikipedia.org/wiki/1-Pyrroline-5-carboxylic_acid

    1-Pyrroline-5-carboxylic acid (systematic name 3,4-dihydro-2H-pyrrole-2-carboxylic acid [2]) is a cyclic imino acid. Its conjugate base and anion is 1-pyrroline-5-carboxylate (P5C). In solution, P5C is in spontaneous equilibrium with glutamate-5-semialdhyde (GSA).

  6. N-Hydroxyphthalimide - Wikipedia

    en.wikipedia.org/wiki/N-Hydroxyphthalimide

    Hydrolysis of N-hydroxyphthalimide by the addition of strong bases produces phthalic acid monohydroxamic acid by adding water across one of the carbon–nitrogen bonds. [5] N-Hydroxyphthalimide ethers, on the other hand, are colorless and provide O-alkylhydroxylamines by alkaline hydrolysis or cleavage through hydrazine hydrate.

  7. 2 men accused of operating drones 'dangerously close' to ...

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    Two men faced arraignment Monday in Boston, accused of conducting a "hazardous drone operation" too close to Logan International Airport as concerns over airspace safety and national security ...

  8. Basic aromatic ring - Wikipedia

    en.wikipedia.org/wiki/Basic_aromatic_ring

    Examples of non-basic nitrogen-containing aromatic rings are pyrrole and indole. Pyrrole contains a lone pair that is part of the pi-conjugated system, so it is not available to deprotonate an acidic proton. [1] The basic aromatic rings purines and pyrimidines are nucleobases found in DNA and RNA.

  9. Costco membership growth 'robust,' even amid fee increase ...

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    More shoppers came to Costco stores in the three months ending Nov. 24, just days ahead of Black Friday. The company saw sales up 7.5% over last year.