Hi, I teach Chemistry at a high school in Auckland, New Zealand. A colleague of mine made a PowerPoint presentation in which he named the compound below 1,1,3-tribromo-4,4-difluorobutane. Using the first point of difference rule, shouldn't this be: 2,4,4-tribromo-1,1-difluorobutane?
Numbering from the left: 1,1,2,4,4
Numbering from the right: 1,1,3,4,4
The first point of difference is the third number, so shouldn't the numbering start from the left, since 2 is lower than 3?
Or am I misunderstanding the rule?
Thanks for your help