91- 6303239042
Stereoselective partial hydrogenation:
$$R-C \equiv C-R' + H_2 \xrightarrow{Lindlar's \ catalyst} \underset{\mathrm{(cis-alkene)}}{R\overset{\displaystyle H}{\underset{\displaystyle |}{C}}=\overset{\displaystyle H}{\underset{\displaystyle |}{C}}R'}$$Catalyst: Pd/BaSO₄ poisoned with quinoline.
