1.21 a b and c

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Marco_Romo_1M
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Joined: Wed Sep 21, 2016 2:59 pm

1.21 a b and c

Postby Marco_Romo_1M » Thu Mar 09, 2017 4:26 pm

Are we supposed to know how to do these problems? If so, what does diene mean?

Ashley_Thomas_3C
Posts: 20
Joined: Wed Sep 21, 2016 2:56 pm

Re: 1.21 a b and c

Postby Ashley_Thomas_3C » Thu Mar 09, 2017 7:33 pm

You're not supposed to know how to do Q 1.21 for quiz 3 since Prof. Lavelle said we will not be quizzed on alkenes (carbon chains with a double bond). A diene is a hydrocarbon with two carbon double bonds.

Suzanne Reyes-Ingwersen 3A
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Joined: Wed Sep 21, 2016 2:56 pm

Re: 1.21 a b and c

Postby Suzanne Reyes-Ingwersen 3A » Fri Mar 10, 2017 10:49 am

For part C, is it acceptable to start numbering at the top left before the double bond? It gives nearly the same answer, and since the priority for lower numbers is for the double bonds I would think that the locations of the methyl groups would not matter. The name I got was 3-isopropyl-4,5 dimethylcyclohexa-1,4 diene. The answer from the book is 3-isopropyl-1,2-dimethylcyclohexa-1,4-diene.

EllisJang2O
Posts: 18
Joined: Wed Sep 21, 2016 2:55 pm

Re: 1.21 a b and c

Postby EllisJang2O » Sat Mar 11, 2017 7:45 pm

Suzanne Reyes-Ingwersen 3A wrote:For part C, is it acceptable to start numbering at the top left before the double bond? It gives nearly the same answer, and since the priority for lower numbers is for the double bonds I would think that the locations of the methyl groups would not matter. The name I got was 3-isopropyl-4,5 dimethylcyclohexa-1,4 diene. The answer from the book is 3-isopropyl-1,2-dimethylcyclohexa-1,4-diene.


You would still want lower numbers, therefore you should start counting from the right and get "1,2-dimethyl" rather than "4,5-dimethyl".


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