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There are three common naming conventions for specifying one of the two enantiomers (the absolute configuration) of a given chiral molecule: the R/S system is based on the geometry of the molecule; the (+)- and (−)- system (also written using the obsolete equivalents d- and l-) is based on its optical rotation properties; and the D/L system is based on the molecule's relationship to ...
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In chemistry, a racemic mixture or racemate (/ r eɪ ˈ s iː m eɪ t, r ə-, ˈ r æ s ɪ m eɪ t / [1]) is one that has equal amounts of left- and right-handed enantiomers of a chiral molecule or salt. Racemic mixtures are rare in nature, but many compounds are produced industrially as racemates.
A configurational stereoisomer is a stereoisomer of a reference molecule that has the opposite configuration at a stereocenter (e.g., R- vs S-or E- vs Z-). This means that configurational isomers can be interconverted only by breaking covalent bonds to the stereocenter, for example, by inverting the configurations of some or all of the ...
The first patented amphetamine brand, Benzedrine, was a racemic (i.e., equal parts) mixture of the free bases or the more stable sulfate salts of both amphetamine enantiomers (levoamphetamine and dextroamphetamine) that was introduced in the United States in 1934 as an inhaler for treating nasal congestion. [2]
Macy's: 1908 Dolls float high above a baby carriage and other doll accessories and furniture in this early 20th century display from Macy's. Some dolls back then cost $1 , which is roughly $35 today.
He then starred in two seasons as a quarterback at Virginia Tech. In his first season as Virginia Tech's starter in 1999, Vick led the Hokies to an 11-1 record and No. 2 ranking the Associated ...
Glyceraldehyde has one chiral center and therefore exists as two different enantiomers with opposite optical rotation: In the D/L nomenclature, either D from Latin Dexter meaning "right", or L from Latin Laevo meaning "left" In the R/S nomenclature, either R from Latin Rectus meaning "right", or S from Latin Sinister meaning "left"