Example 3, Double Robinson - type cyclopentene 9 annulation Please provide organic reaction mechanisms for examples. Example 3, Double Robinson-type cyclopentene annulation' OH RO₂C OH 10 equiv CO₂R 0.1 equiv FeCl3 6H₂O CH2Cl2, 60 °C, 2 d conc. H2SO4 0 °C, 1 h RO₂C CO₂R then rt, 16 h RO₂C CO₂R

Example 3, Double Robinson - type cyclopentene 9 annulation Please provide organic reaction mechanisms for examples. Example 3, Double Robinson-type cyclopentene annulation' OH RO₂C OH 10 equiv CO₂R 0.1 equiv FeCl3 6H₂O CH2Cl2, 60 °C, 2 d conc. H2SO4 0 °C, 1 h RO₂C CO₂R then rt, 16 h RO₂C CO₂R

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Question

Example 3, Double Robinson - type cyclopentene
9
annulation
Please provide organic reaction
mechanisms for examples.
Example 3, Double Robinson-type cyclopentene annulation'
OH
RO₂C
OH
10 equiv
CO₂R
0.1 equiv FeCl3 6H₂O
CH2Cl2, 60 °C, 2 d
conc. H2SO4
0 °C, 1 h
RO₂C
CO₂R
then rt, 16 h
RO₂C
CO₂R

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