oraganic chemistry-stereocenter

[joonkimdds]

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how many stereocenter are in the picture?

isn't stereocenter the C surrounded by 4 different atoms?
I don't see any C that is surrounded by 4 different atoms.
but the answer is 4.

 

[cdmOMR]

how many stereocenter are in the picture?

isn't stereocenter the C surrounded by 4 different atoms?
I don't see any C that is surrounded by 4 different atoms.
but the answer is 4.

there are 4...3 on the cyclic molecule, and one on the bottem hydrocarbon chain

 

[joonkimdds]

there are 4...3 on the cyclic molecule, and one on the bottem hydrocarbon chain

the one on the bottom of hydrocarbon chain,
it is connected to 2C, 1OH and 1H.
if stereocenter means surrounded by 4 different atom, it's already surrounded by 2 same atom, 2C so how do i call it stereocenter?

and the top one of cyclic molecule is surrounded by 3C and 1H so it's surrounded by 3 same atom, 3C, ain't i right?

 

[cdmOMR]

the one on the bottom of hydrocarbon chain,
it is connected to 2C, 1OH and 1H.
if stereocenter means surrounded by 4 different atom, it's already surrounded by 2 same atom, 2C so how do i call it stereocenter?

and the top one of cyclic molecule is surrounded by 3C and 1H so it's surrounded by 3 same atom, 3C, ain't i right?

you cant just end at Carbon...you have to keep going, like a tiebreaker. One of the Carbons is bonded to two H's and another C and the other Carbon has a double bond to another carbon with one H making it different. Same situation with the cyclic molecule...keep going if they are the same until they run into eachother/end up at a different atom/or end.

 

[djeffreyt]

The point isn't that the carbon has to be connected to 4 different atoms, a stereogenic center is a carbon atom bonded to 4 different substitutent groups. Those groups can be anything different. An ethyl group is different from a methyl group, a carbonyl group is different from a carboxyl group. Even though the next atom to the stereogenic center atom is still a carbon in all the cases I stated above, the GROUP is different.

 

[joonkimdds]

super!!! awesome! Thanks!