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D-Glucose, Fischer projections

Conventional representation of a carbon atom (e.g. C-2 of D-glucose) in the Fischer projection. Representation (e) will be used in general in the present document. [Pg.56]

The formula below is the Fischer projection for the acyclic form of D-glucose. The Fischer projections of the other aldoses (in the acyclic form) are given in Chart I (2-Carb-2.2)., ... [Pg.57]

The following schematic representation of pyranose ring closure in D-glucose shows the reorientation at C-5 necessary to allow ring formation this process corresponds to the change from Fischer to modified Fischer projection. [Pg.61]

Fig. 1. Higher-order sugars L-g/yceroD-manno-Heptose (1, open-chain and 2, a-pyranose) and A -acetylneurami ilic acid (3, a-pyranose form). Structures 4-8 depict D-glucose (4) as its open-chain Fischer projection, and as the a-oxetose (5), a-furanose (6), a-pyranose (7), and a-septanose (8) ring forms. Fig. 1. Higher-order sugars L-g/yceroD-manno-Heptose (1, open-chain and 2, a-pyranose) and A -acetylneurami ilic acid (3, a-pyranose form). Structures 4-8 depict D-glucose (4) as its open-chain Fischer projection, and as the a-oxetose (5), a-furanose (6), a-pyranose (7), and a-septanose (8) ring forms.
Comparison of the Fischer (a) and Haworth (b) projections for a- and /3-D-glucose. The Haworth projection is a step closer to reality. Chair configurations for the two anomers of D-glucose are the most accurate depiction (c) but they are not always used because of the difficulty in drawing. Note that the largest substituent, —CH2OH, is in an equatorial location in both structures. The differences between the two anomers are shown in color. [Pg.246]

FIGURE 1.5 The (a) linear Fischer projection of D-glucose and the (b) cyclic Fischer, (c) Haworth, (d) simplified Haworth, and (e) Mills projections of a-D-glucopyranose. [Pg.6]

The Fischer projection formula for D-glucose (Example 2.3) is also known as the open- or straight-chain structure. This structure occurs only in solution. There are two crystalline forms of D-glucose, known as a and /3, which also have different optical activities when dissolved. X-ray diffraction studies have confirmed chemical evidence that a- and /3-D-glucose are structures containing a ring of five carbon atoms and one oxygen atom ... [Pg.32]

Figure III-5 a- and /Fanomers of d- and L-glucose in Fischer projection. The anomeric carbons are shown in boldface. Figure III-5 a- and /Fanomers of d- and L-glucose in Fischer projection. The anomeric carbons are shown in boldface.
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See also in sourсe #XX -- [ Pg.32 , Pg.34 ]

See also in sourсe #XX -- [ Pg.6 ]



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