Question

Hello, I just made a structure myself and its the following one, I let chemdraw name the structure but according to the rules the parent chain is not "hexadec" but "undec". Here are those rules which help to determine the parent chain: http://www.acdlabs.com/iupac/nomenclature/79/r79_933.htm#ID_73zo0o
http://gyazo.com/0475e41626b9af19e7182c7661ea473b
The first rule says:
(a) Maximum number of substituents corresponding to the principal group.
We have no principal suffix group so we go on to the second rule and it says:
(b) Maximum number of double and triple bonds considered together.

Answer 1

Can someone confirm if chemdraw gave the wrong name please? Thanks!!

Answer 2

undec is an 11 carbon chain. that parent chain has 16 carbons so im not sure what 16 carbon chain is called but hexadec sounds reasonable as it has hex prefix in it

Answer 3

yes but we have to properly choose a parent chain we cant just choose one! The rules say we need the maximum number of double and triple bonds which is undec and not hexadec.
Rules for choosing the parent chain : http://www.acdlabs.com/iupac/nomenclature/79/r79_933.htm#ID_73zo0o

Answer 4

Can someone please confirm if Im right?

Answer 5

LOL ur truly very much interested in naming the chemicals :) good exercise

Answer 6

yes, but this is basic things so everyone should know this. Do you know if Im right Chmvijay?

Answer 7

da funk?

Answer 8

whats wrong help me please

Answer 9

Can you help me please?

Answer 10

What with?

Answer 11

With my question :p I dont know if the chemdraw is right or wrong?

Answer 12

Why would you draw a structure that you can't name? Do you know IUPAC rules?

Answer 13

Yes I am learning them
and they tell that the parent chain is chose according to the maximum number of double and triple bonds together, that is not the case in the structure!

Answer 14

I know, but this is IUPAC and do you mean the program is not according to the IUPAC then?

Answer 15

according to IUPAC, the parent chain is the longest carbon chain that contains the maximum number of double and triple bonds. If there are two or more chains competing for selection as the parent chain (chain with the most multiple bonds), the choice goes to (1) the chain with the greatest number of carbon atoms, (2) the # of carbon atoms being equal, the chain containing the maximum number of double bonds.

Answer 16

"is the longest carbon chain" Isnt that wrong? because we first need to look at the maximum number of multiple bonds regardless of the lenght of chain. Its after this if we have 2 chains with equal number of mutliple bonds competing for parent chain that we look at the Lenght ( " (1) the chain with the greatest number of carbon atoms" ) of the chain.

According to http://www.acdlabs.com/iupac/nomenclature/79/r79_933.htm#ID_73zo0o

These are the rules :

13.11 - In an acyclic compound, that chain upon which the nomenclature and numbering are based is called the "principal chain". When in an acyclic compound there is a choice for principal chain, the following criteria are applied successively, in the order listed, until a decision is reached:

(a) Maximum number of substituents corresponding to the principal group.

(b) Maximum number of double and triple bonds considered together.

(c) Maximum length.

(d) Maximum number of double bonds.

(e) Lowest locants for the principal groups (that is, for the suffix).

etc...

Answer 17

I just took Ochem I last semester and we were taught that the longest carbon chain is the parent chain. it has nothing to do with double and triple bonds, though that is included in the naming with the parentchain. for example.....