glucose-6-phosphate . . . fructose-6-phosphate

Phosphofructokinase-2 converts fructose-6-phosphate to fructose-2,6-bisphosphate.

Glucose-6-Phosphate to Fructose-6-Phosphate. reversible. Phosphogluctose isomerase.

The intermediate products of glycolysis include glucose-6-phosphate, fructose-6-phosphate, fructose-1 6-bisphosphate, PGAL, bisphosphoglycerate, and PEP. The main intermediate products are fructose-1 6-bisphosphate, PGAL, and PEP.

Fructose , after being absrobed ,goes through two pathways. Either it forms fructose-6-phosphate (by hexokinase) or it gets phosphorylated to fructose-1-phosphate by fructokinase found in liver.since liver contains much of he fructose obtained from diet fructose-1-phosphate is produced in appreciable amounts. Fructose-1-phosphate is acted upun by ALDOLASE B which breaks it into glecraldehyde and Dihydroxyacetone phosphate. both these enter glycolysis and since reactions catalyzed be hexokinase and epecially PFK-1 have been skipped in Fructose-1-phosphate metabolism hence glycolysis occurs faster ( PFK1 reaction is the main rate limiting step in glycolysis)