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  2. Fischer projection - Wikipedia

    en.wikipedia.org/wiki/Fischer_projection

    In chemistry, the Fischer projection, devised by Emil Fischer in 1891, is a two-dimensional representation of a three-dimensional organic molecule by projection. Fischer projections were originally proposed for the depiction of carbohydrates and used by chemists, particularly in organic chemistry and biochemistry .

  3. Threose - Wikipedia

    en.wikipedia.org/wiki/Threose

    As is depicted in a Fischer projection of D-threose, the adjacent substituents will have a syn orientation in the isomer referred to as "threo", and are anti in the isomer referred to as "erythro". [3] [4] Fischer projections depicting the two enantiomers of threose

  4. Ribose - Wikipedia

    en.wikipedia.org/wiki/Ribose

    L-Ribose Fischer Projection. Ribose is a simple sugar and carbohydrate with molecular formula C 5 H 10 O 5 and the linear-form composition H−(C=O)−(CHOH) 4 −H. The naturally occurring form, d-ribose, is a component of the ribonucleotides from which RNA is built, and so this compound is necessary for coding, decoding, regulation and expression of genes.

  5. Stereoisomerism - Wikipedia

    en.wikipedia.org/wiki/Stereoisomerism

    A Fischer projection can be used to differentiate between L- and D- molecules Chirality (chemistry). For instance, by definition, in a Fischer projection the penultimate carbon of D-sugars are depicted with hydrogen on the left and hydroxyl on the right. L-sugars will be shown with the hydrogen on the right and the hydroxyl on the left.

  6. Anomer - Wikipedia

    en.wikipedia.org/wiki/Anomer

    In aldohexoses the anomeric reference atom is the stereocenter that is farthest from the anomeric carbon in the ring (the configurational atom, defining the sugar as D or L). For example, in α-D-glucopyranose the reference atom is C-5. If in the cyclic Fischer projection [3] the exocyclic oxygen atom at the anomeric centre is cis (on the same ...

  7. Structural formula - Wikipedia

    en.wikipedia.org/wiki/Structural_formula

    Nonetheless, the Fischer projection is a simple way of depicting multiple sequential stereocenters that does not require or imply any knowledge of actual conformation. A Fischer projection will restrict a 3-D molecule to 2-D, and therefore, there are limitations to changing the configuration of the chiral centers.

  8. Hexose - Wikipedia

    en.wikipedia.org/wiki/Hexose

    The L-isomers are generally absent in living organisms; however, L-altrose has been isolated from strains of the bacterium Butyrivibrio fibrisolvens. [6] When drawn in this order, the Fischer projections of the D-aldohexoses can be identified with the 3-digit binary numbers from 0 to 7, namely

  9. Absolute configuration - Wikipedia

    en.wikipedia.org/wiki/Absolute_configuration

    The D/L system (named after Latin dexter and laevus, right and left), not to be confused with the d-and l-system, see above, does this by relating the molecule to glyceraldehyde. Glyceraldehyde is chiral itself and its two isomers are labeled D and L (typically typeset in small caps in published work). Certain chemical manipulations can be ...