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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.
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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.
High levels of lead were found in 12 brands of cinnamon powder and multi-spice powders, according to testing released Thursday by Consumer Reports, a nonprofit that helps consumers evaluate goods ...
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A 2005 review combined with quantum chemical calculations concluded that arsole itself is "moderately" aromatic as its ring current is 40% that of pyrrole, which is known to be aromatic. However, comparable ring current was calculated for cyclopentadiene , which has long been regarded as non-aromatic. [ 2 ]
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Cost: $12.54 for 4oz.| Key Ingredients: 5 % Menthol | Cooling, Warming, Neutral: Cooling | Scent: Menthol, fades to neutral scent. Biofreeze Professional Pain Relief Gel is the best overall muscle ...
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