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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.
Chlorfenapyr was developed by American Cyanamid from the natural product dioxapyrrolomycin, which was isolated from Streptomyces fumanus. [2]The United States Environmental Protection Agency initially denied registration in 2000 for use on cotton primarily because of concerns that the insecticide was toxic to birds and because effective alternatives were available. [3]
Tomato juice and sauce are ineffective at neutralizing the odor of a skunk. [44] Effective treatments for skunk odor involve artificial compounds rather than household remedies. [45] Porcupines do not shoot their quills. They can detach, and porcupines will deliberately back into attackers to impale them, but their quills do not project. [46 ...
The standard dose is about the same, 1–2 mg per pound of body weight, but a slightly higher dose of 3 mg per pound may be helpful with some dogs. (This is higher than the dose recommended, but ...
Page information; Get shortened URL; Download QR code; Print/export Download as PDF; Printable version; In other projects ... Pyrrole; Pyrrole-2-carboxylic acid; A ...
2,5-Bis(hydroxymethyl)pyrrole is an organic chemical compound with formula C 6 H 9 O 2 N, or (HOCH 2) 2 (C 4 H 3 N). Its molecule can be described as that of pyrrole C 4 H 5 N with hydroxymethyl groups HO−CH 2 − replacing the two hydrogen atoms adjacent to the nitrogen atom. The compound is a white solid, soluble in water and acetone.
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Fragrance bottles. An aroma compound, also known as an odorant, aroma, fragrance or flavoring, is a chemical compound that has a smell or odor.For an individual chemical or class of chemical compounds to impart a smell or fragrance, it must be sufficiently volatile for transmission via the air to the olfactory system in the upper part of the nose.