Alphabetical order for multiples

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Isa AbdulCader 3K
Posts: 18
Joined: Fri Sep 25, 2015 3:00 am

Alphabetical order for multiples

Postby Isa AbdulCader 3K » Tue Mar 08, 2016 5:28 pm

When you have for example, X,Y-dimethyl and Z-ethyl, which has alphabetical priority? Is it the D in dimethyl, or E in ethyl being before the M in methyl assuming the prefix isn't factored into alpha order? Also, what do you call it when there is a di/tri-methyl in a compound (I referred to it as multiples in the title because I do not know the correct terminology)? Many thanks.

Bryan Lau 3H
Posts: 53
Joined: Fri Sep 25, 2015 3:00 am

Re: Alphabetical order for multiples

Postby Bryan Lau 3H » Tue Mar 08, 2016 5:56 pm

E in ethyl is before the M in methyl because the prefix isn't factored into alpha order. When there are multiple methyl's in a compound, you list the numbers of carbons to which they are attached and then say di/tri/tetra/methyl.

(Ex: 1,3,5 - trimethylalkane)

Ariana Bowers 1H
Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

Re: Alphabetical order for multiples

Postby Ariana Bowers 1H » Wed Mar 09, 2016 10:14 pm

Furthermore, when you add iso, neo, sec and tert to a name, only iso and neo count towards the alphabetical order, whereas sec and text do not.


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