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To dehydrate you need to remove a hydroxyl group and a hydrogen atom from an adjacent carbon. Dihydroxyacetone doesn't have an appropriate configuration. Apart from that dehydration doesn't help you isomerise to glyceraldehyde 3-phosphate.
Author: Jon Maber
j.r.maber@leeds.ac.uk
Dept Biochemistry & Molecular Biology, The University of Leeds, U.K.