Question

Hydrogenation of a di-substituted chalcone. Chem 2311.

The catalyst used is excess H2 in 10% Pd/C, and methanol. This produces 7 different possible products.

Mechanism: a) Propose two advantages of having the palladium metal delivered as a support on carbon instead of using elemental palladium metal? (see p. 148 of the manual for ideas) b) Whether hydrogen is prepared in situ, as in this experiment from ammonium formate, or delivered froma hydrogen gas cylinder, the mechanism of the catalytic reduction process is the same. Use a schematic diagram to illustrate how unreactive diatomic hydrogen (H2) is rendered more reactive on a metal surface, then delivers hydrogen to a substrate in a cis orientation. Use a generic double bond to illustrate. (Feel free to attach on separate paper). Example: H-H active metal

Answer 1

YO ea e. oon en 2pare mam um 6/ moni

PAGE NO. DATE: ron eH ioteoelective n eactive