Outline two ways in which 4-methyl-2-octanone can be prepared by conjugate addition of an...

Outline two ways in which 4-methyl-2-octanone can be prepared by conjugate addition of an organocuprate to an α,β-unsaturated ketone.

Sample Solution Mentally disconnect one of the bonds to the β carbon so as to identify the group that comes from the lithium dialkylcuprate.

According to this disconnection, the butyl group is derived from lithium dibutylcuprate. A suitable preparation is

Now see if you can identify the second possibility.