Phenyl- or benzo- ?

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Mad Man
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#1
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How do you distinguish the two?
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melancollege
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Phenyl is used as a prefix, benzene when it is the main functional group, e.g. bromobenzene has benzene as the main functional group, whereas for 1-phenylethanol, the alcohol group is the main one.
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Mad Man
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BlueChicken
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Mad Man
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(Original post by melancollege)
Phenyl is used as a prefix, benzene when it is the main functional group, e.g. bromobenzene has benzene as the main functional group, whereas for 1-phenylethanol, the alcohol group is the main one.
Ok the question is, how do you know which functional group is the main one?
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charco
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(Original post by Mad Man)
Ok the question is, how do you know which functional group is the main one?
I don't think that there is a hard and fast "one size fits all" answer.

When there is a carbon chain attached to a benzene ring the benzene ring becomes the attachment and is phenyl.
BUT this does not account for phenol

My advice is to learn the common functional groups.

chlorobenzene
nitrobenzene
methylbenzene
benzaldehyde
benzene carboxylic acid (benzoic acid)
benzene carbonyl chloride (benzoyl chloride)
methoxybenzene

phenol
phenylamine
phenylmethanol
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Mad Man
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(Original post by charco)
I don't think that there is a hard and fast "one size fits all" answer.

When there is a carbon chain attached to a benzene ring the benzene ring becomes the attachment and is phenyl.
BUT this does not account for phenol

My advice is to learn the common functional groups.

chlorobenzene
nitrobenzene
methylbenzene
benzaldehyde
benzene carboxylic acid (benzoic acid)
benzene carbonyl chloride (benzoyl chloride)
methoxybenzene

phenol
phenylamine
phenylmethanol
Ahh so it's the "old process of elimination" approach...

Can you give me an extensive list of these functional groups or give me a source which teaches me how to differentiate the prefix from its suffix (further reading).
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BlueChicken
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(Original post by Mad Man)
BlueChicken
(Original post by Mad Man)
Ok the question is, how do you know which functional group is the main one?

Do these help?:

https://www.chemguide.co.uk/basicorg...ns/names3.html
https://www.youtube.com/watch?v=ud8TrKjRHvE
https://www.youtube.com/watch?v=i7_t411jFAU

It can be tricky if you only have one (small) substituent on the benzene ring, as historically these have a variety of names - I would learn the common ones for these. In all other cases, stick with the IUPAC naming convention and you should be fine (as that's what you'll be tested on - note: no specific mention of naming aromatics in AQA syllabus, just that you should know IUPAC naming conventions generally).
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Mad Man
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#8
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(Original post by BlueChicken)
Do these help?:

https://www.chemguide.co.uk/basicorg...ns/names3.html
https://www.youtube.com/watch?v=ud8TrKjRHvE
https://www.youtube.com/watch?v=i7_t411jFAU

It can be tricky if you only have one (small) substituent on the benzene ring, as historically these have a variety of names - I would learn the common ones for these. In all other cases, stick with the IUPAC naming convention and you should be fine (as that's what you'll be tested on - note: no specific mention of naming aromatics in AQA syllabus, just that you should know IUPAC naming conventions generally).
This is perfect!
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