Cyclization gives the a- and b-furanose forms of L-arabinose.In the Lseries the anomeric hydroxyl is up in the aisomer and down in the bisomer.(d)The Fischer projection formula for D-threose is given in the text Figure 25.2. Reorientation ofthat projection into a form that illustrates its potential for cyclization is shown.Cyclization yields the two stereoisomeric furanose forms.25.6(b)The Fischer projection and Haworth formula for D-mannose areThe Haworth formula is more realistically drawn as the following chair conformation:
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