The overall Rubisco reaction is summarized below. The mechanism for the Rubisco reaction is somewha involved, but if we break it down into its individual steps, it becomes more manageable. Let's practice a "retrosynthesis" of this reaction by working backwards from the product according to the following steps. (You just need to draw a series of intermediates and labeled reactions, not a full arrow-pushing mechanism.) 1) The final phosphoglycerate product molecules in the Rubisco reaction were formed from a hydrolytic retro-Claisen cleavage reaction, which broke the bond between carbons 2 and 3. 2) Prior to that, a carboxylation reaction occurred (via an enol attack of CO2 by carbon 2) 3) Finally, the ribulose bisphosphate starting material can be reached via one more reaction; label the last (i.e., the "first"!) reaction arrow with the correct reaction. 2x phosphoglycerate ribulose-1,5-bisphosphate cO2 H20 он он он о но
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