In the conversion shown below I need to find B . Initially I thought of protecting the carbonyl group using ethylene glycol and then carry out reduction of double bonds using hydrogenation but it is required to be a single reagent and cannot be multi step. What are the other ways in which it can be done?

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  • 2
    $\begingroup$ You're overthinking. Usual reagents are selective enough here, so no protecting is needed. $\endgroup$
    – Mithoron
    Commented Apr 15, 2020 at 18:07
  • 5
    $\begingroup$ Hydrogenation under relatively low pressure will do this without touching the ketone $\endgroup$
    – Waylander
    Commented Apr 15, 2020 at 19:22

1 Answer 1


You can do a normal hydrogenation reaction(H2,Pd) under low pressures as suggested by @Waylander. Alternatively you can use the Wilkinson's catalyst which also is a way to do catalytic hydrogenation but is capable of only reducing the double bond.


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