IUPAC nomenclature

Billyionaire

2012-03-31 1:07 am

1.What sholud be the name for organic compounds with alkyl group joining the main chain carbon directly with a double bond?
For example

In CH2=CH-CH2-CH=CH2 ( pent-1,4-diene?)
If a =CH2 group replace the H in the C-3 to form
CH2=CH-C-CH=CH2
((((((((((((ll
(((((((((((CH2
what should be the name of the compound?
Is the main chain pent-1,4-diene or but-1,3-diene?
Or is it called 2-vinyl-but-1,3-diene?
It may not be easily synthesised but does it has a name?

2. What is the name for compound connect to 5~20 methyl group?
For example,

C(CH3)4 is connected to 2 alkyl branches and is called 2,2-dimethylpropane
How about CH3CH(CH3)2CH(CH3)2CH(CH3)2CH(CH3)2CH3?
Its main chain hexane is connected to 8 methyl group

It it called 2,2,3,3,4,4,5,5-(?)methylhexane or sth else?

回答 (1)

Ka ho

2012-04-07 8:51 am

✔ 最佳答案

1.If a =CH2 group replace the H in the C-3
I think it is 3-vinyl-pent-1,4-diene
2.your example is wrong ～how can a carbon atom connect to two carbon,one hydrogen and 2 methyl group?
correct structure should be CH3C(CH3)2C(CH3)2C(CH3)2C(CH3)2CH3
the IUPAC name should be
2,2,3,3,4,4,5,5-dimethylhexane dimethyl- means that there are two methyl groups connected to a same carbon atom no matter how many carbon atoms connected to two methyl groups.

2012-04-08 15:54:29 補充：
sorry-.-I make that mistake....It should be
2,2,3,3,4,4,5,5-octamethylhexane

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