Cyclic Ketone Question

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

busupshot83

S.D.N. Vet
7+ Year Member
15+ Year Member
20+ Year Member
Joined
Mar 23, 2003
Messages
2,247
Reaction score
3
Can someone explain why numbering this cyclic ketone (see image attatchment) counter-clockwise (so that the ethyl group has a location number of 2) is correct? Why not number it clockwise (so that the isopropyl group has a location number of 2)?

The name of the compound is 2-ethyl-7-isopropylcycloheptanone. Does the numbering here have to do with ethyl coming before isopropyl alphabetically?
 

Attachments

Top