Expanding and Naming of Abbreviated Chemical Formulas

  • Chemistry
  • Thread starter jackthehat
  • Start date
  • #1
41
5
Homework Statement:
Expand and show the structure diagram of the following substance with abbreviated chemical formula - C-(CH3)3-(CH-Br-CH2)-(CH2)2-CH3 and name the substance.
Relevant Equations:
Expanding and Correctly Naming Organic Formula
I noted that the number of carbons in the main chain is 7 (5 carcons and the outer two are attached to an outside 'CH3' grouping .. and the bonds are all single so we have a Heptane.
We have the main chain diagram structure as follows ..
-C-C-C-C-C-C-C- .. If we then number these carbons as .. -C1-C2-C3-C4-C5-C6-C7-
Then C1 has 3 x Hydrogen atoms attached ...
C2 has 2 x 'CH3' Methyl groups attached (above and below) ...
C3 has a Hydrogen and a Bromine ('H' and 'Br') attached above and below it on the diagram ..
C4, C5 and C6 each have 2 Hydrogens attached (one above and one below) ..
and C7 (extreme right) has 3 Hydrogen atoms attached.
The above would be shown on a normal line diagram and shows a linear structure.
From this I named the substance .. 3-Bromo-2,2-DiethylHeptane

My questions to you are ..
1. Have I identified this correctly as a 'Heptane' or do I count the extreme right and left hand side 'CH3' groupings as not in the main chain but as separate 'Methyl' groups thus losing 2 Carbons from the main chain and making this a 'Pentane' instead ?
2. Assuming that I am correct in identifying this as a 'Heptane' .. have I used the correct naming convention here .. or if it is a 'Pentane' as I query above .. would the correct name then be ..
2-Bromo-1,1-DiethylPentane instead ?
Regards,
Jackthehat
 

Answers and Replies

  • #2
Borek
Mentor
28,674
3,166
Dimethyl, other than that 3-bromo-2,2-dimethylheptane looks OK (note the capitalization: or rather lack of it).

Rather lousy way of expressing the structure, it suggests the Br is part of the chain.
 

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