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Benzene phenol and cyclo hexane OH MY!!! ??WTF?

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bubblegumpi:
I am struggling to figure this most useful and common group which is which and when is it called.

For example: 5,5-DIPHENYLHYDANTOIN; 57-41-0; Diphenylhydantoin; Dilantin Picture attached.


This is called diphenyl, so I see the six carbon rings with H:C in the 1:1 so its not cyclo hexane, but there are no OH groups that make benzene into phenol. Why is this not called dibenzene... ?

Also if you are looking at the diagram and you don't see the circle in the hexagon ring or the double bonds( = ) in three spots of the ring are they still there but just not illustrated?


As far as organic chemistry goes should we in proctise ignore cyclohexane C6H12 because its just not that common as a precursor or functional group or useful reagent to be used in the lab? Cyclohexane is found in gasoline and petro fuels but as I start my college education not worry about it too much, because while it looks like benzene its not? I like to try and figure out the names of things especially while looking at the shape of a drug vs. what it does to your body (another future college career path to me).

mjc123:
The C6H5- group is called "phenyl". If there was an O, C6H5O- is called "phenoxy".
Just to confuse things, the C6H5CH2- group is called "benzyl".
That's how it is. You just have to learn these things.

If you see a hexagon without a circle or three double bonds, it is cyclohexane. (Non-chemists sometimes draw a benzene ring as simply a hexagon, but this is frowned on by chemists.)

Borek:
Short version: don't expect too much logic in historical names that are still is use.

bubblegumpi:

--- Quote from: mjc123 on December 03, 2018, 08:03:31 AM ---The C6H5- group is called "phenyl". If there was an O, C6H5O- is called "phenoxy".
Just to confuse things, the C6H5CH2- group is called "benzyl".
That's how it is. You just have to learn these things.

If you see a hexagon without a circle or three double bonds, it is cyclohexane. (Non-chemists sometimes draw a benzene ring as simply a hexagon, but this is frowned on by chemists.)

--- End quote ---
   

C6H5O does that have a ring with 6C and an O in the ring making a 7 member ring? Or do mean a 6C ring with a O attached to the 1' carbons with a double bond? Or do you mean one ring of a dioxin? (Dioxin is great for your face and complexon as that ukranian presidential candidate found out the hard way, if you are having trouble getting it for your tea, ask vlad putin or the KGB, trumps got him on speed dial)

jeffmoonchop:
C6H5O- is a benzene ring with an O singly bonded to a carbon. There are no available bonds to form a double bond from a benzene ring, if there was it wouldn't be aromatic.

I'm not sure I've come across anyone drawing benzene without a ring in the centre or the 3 double bonds. I was taught that the frowned upon structure was drawing a ring inside the hexagon. Always draw the three double bonds. Anything without either the ring or double bonds is a cyclohexane.

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