Question

3. Wilkinson developed two catalysts, RhCl(PPh3)3 and RhH(CO)(PPh3)3. Which would you choose to catalyze the isomerization of cis-MeCH=CHMe to the trans isomer without using any other chemical other than a solvent? Show a proposed mechanism to accomplish this desired isomerization.

Wilkinson developed two catalysts, RhCl(PPh3)3 and RhH(CO (PPh3)3. Which would you choose to catalyze the isomerization of cis-MeCH-CHMe to the trans isomer without using any other chemical other than a solvent? Show a proposed mechanism to accomplish this desired isomerization.

Answer 1

Answe TO nealHe an isomeniaon ot Cis MecH CHme Fo the tans isomen you must use R htt (co)(Pph an isomeni 2ahon with Rhcl(pph:) with out using any othon than a Solvent bemuse instead ot Rhei (PPh3) This is 0 Othen com Pound CHa)to tans tam the equiaes dios the addihon he oledine iso maizaion Con be Catay st in RhH2ci (PPh3)2 and then done H Ph3P CI PhaP PhaP ci CH3 H3c Rh pphs Ph:P Ph3P Pph3 pph3 Ph3P H H H Phyf CH Rh PPh Phip Cataiy st, Rht Cco)(PPh)3 , it is possible aeali2e uSIng any otho nea ctant than a soVent. kith the othoi with out the isomoni 3a tion mechanism Paaposed the H1 Hi H1 ph: Ph3 Hc CH www pphs pph3 ph3P PH3P Co H3C Pn3P Rh-Pphi+ CH3 Ph3P