Search results
Results from the WOW.Com Content Network
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.
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 ...
General chemical structure of a selenenic acid. A selenenic acid is an organoselenium compound and an oxoacid with the general formula RSeOH, where R ≠ H. It is the first member of the family of organoselenium oxoacids, which also include seleninic acids and selenonic acids, which are RSeO 2 H and RSeO 3 H, respectively.
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.
α-Selanylation of carbonyl compounds can be accomplished with electrophilic or nucleophilic selanylating reagents. Usually, simple phenylseleno compounds are used in elimination reactions; although 2-nitrophenylselenides react more quickly, they are more expensive to prepare, and phenylselenides typically react in minutes.
5. Review the confirmation page. It will offer you the option of changing to a lower-priced plan rather than canceling your account. If you'd like to proceed with changing your account to a free AOL account, scroll to the bottom of the page and click Cancel My Billing. 6.
Download time may take 10-15 minutes over dial-up. Call 1-888-265-5555 to order a CD for faster installation.
The mechanism involves oxidation of the selenol of a selenocysteine residue by hydrogen peroxide. This process gives the derivative with a selenenic acid (RSeOH) group. The selenenic acid is then converted back to the selenol by a two step process that begins with reaction with GSH to form the GS-SeR and water. A second GSH molecule reduces the ...