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States that ratify the treaty agree to allow product samples and advertising material into the county duty-free. [1] The Convention allows the duty-free importation of commercial samples that are determined to be of "negligible value". It also allows the duty-free importation of advertising material such as catalogues, price lists, and trade ...
Free sample of Peter Pan peanut butter, promising it "does not stick to the roof of your mouth" A product sample is a sample of a consumer product that is given to the consumer free of cost so that they may try a product before committing to a purchase. When it comes to marketing non-durable commodities, such as food items, sampling is crucial.
The structure of a generic selenol. Selenols are organic compounds that contain the functional group with the connectivity C−Se−H. Selenols are sometimes also called selenomercaptans and selenothiols. Selenols are one of the principal classes of organoselenium compounds. [1] A well-known selenol is the amino acid selenocysteine.
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The diselenide can be converted back to the selenol by reduction followed by acidification of the resulting PhSe −. PhSeH is acidic with a pK a of 5.9. Thus at neutral pH, it is mostly ionized: PhSeH → PhSe − + H + It is approximately seven times more acidic than the related thiophenol. Both compounds dissolve in water upon the addition ...
Methaneselenol is the organoselenium compound with the formula C H 3 SeH.It is the simplest selenol.A colorless, poisonous gas, it is notorious for its foul, putrid odor. It is prepared by reaction of methyl lithium or a methyl Grignard reagent with selenium followed by protonation of the product.
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