Hydrogenation of some allylic alcohols catalysed by anchored montmorillonitebipyridinepalladium(II) acetate - A kinetic study

Hydrogenation of some allylic alcohols like 2-methyl-2-propen-1-ol, 4-pente n-3-ol, trans-2-buten-1-ol, trans-3-penten-2-ol and 4-methyl-3-penten-2-ol has been carried out by anchored montmorillonitebipyridinepalladium(II) ace tate in THF medium. Under the reaction conditions 100% saturation of carbon -carbon double bond is observed and there is neither polymerisation nor iso merisation. The observed rate has been found to be first order each with re spect to partial pressure of hydrogen and [substrate] and fractional order with respect to [catalyst]. The rate of hydrogenation follows the order: 2- methyl-2-propen-1-ol > 4-penten-3-ol > trans-2-buten-1-ol > trans-3-penten- 2-ol > 4-methyl-3-penten-2-ol. Thermodynamic parameters have been evaluated , rate law and a plausible mechanism have been proposed.