How do we name this group?
It is 2 R groups, with one C atom only between them (bonded to each); from this C atom stems directly a double bond to another C atom, and this latter C atom then connects to another (so there is a methyl group off the double bond, and the double bond coming directly off the main chain).
The problem is that standard naming from the beginning does not work, because by definition of this problem the R groups are the parent chain and so this double bond is a side-substituent. But from what I know of branched naming, the numbering on the chain would start at the first atom exclusively on that chain which has the double bond, whereas now, the atom which connects to the chain (and is itself part of the parent chain, with the double bond substituent coming off it) is the first in the double bond.
Not sure if this is an undergraduate or high school problem but I thought I would post it here. Thanks for the help.