Priority in Numbering

Moderators: Chem_Mod, Chem_Admin

David Bui 1C
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Priority in Numbering

Postby David Bui 1C » Mon Mar 07, 2016 9:51 am

So is it true that all functional groups except for halogens have the priority for the lowest numbering?

Marvin Lu 1E
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

Re: Priority in Numbering

Postby Marvin Lu 1E » Mon Mar 07, 2016 9:53 am

This is true. We tend to start the chain at the functional group, however we treat halogens as a substituent. We number and name halogens based off alphabetical order or lowest number chain.

204408136
Posts: 6
Joined: Mon Jan 26, 2015 2:17 pm

Re: Priority in Numbering

Postby 204408136 » Mon Mar 07, 2016 11:40 am

Can someone post an example of this?

rivera_1J
Posts: 15
Joined: Fri Sep 25, 2015 3:00 am

Re: Priority in Numbering

Postby rivera_1J » Mon Mar 07, 2016 5:06 pm

An example of functional groups having priority over halogens is in the course reader page 104
ClCH2CH2CH(OH)CH3 here the alcohol functional group gets numbered as 2 and the chlorine is 4 because functional groups get priority in numbering over substituents and double/triple bonds
IMG_8476.JPG
example in course reader


Return to “*Haloalkanes”

Who is online

Users browsing this forum: No registered users and 0 guests