are these stereoisomers of each other

[hypertrophy95]

I got question 1b marked wrong even though it's correct. I rotated the back carbon of the newman to create a stereosiomer yet she took all points off. In my textbook it clearly says that "If the compounds have the same connectivity of atoms then they are stereosiomers, and if you rotate about a single bond then u make a conformational isomer". Therefore, my compound is a stereoisomer, but more specifically a conformational isomer. Am I wrong? Do I deserve points on that question?

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[caffeinemia]

I am pretty sure this is going to test prep. But isnt a stereoisomer a mirror? I am not sure i see mirroring

Edit: whoops i was thinking of enantiomers.

 

[mimelim]

It has been a long ass time since I've thought about this, but I think that you are correct and have made a rotamer (which is a stereoisomer)

 

[hoihaie]

Nvm

 

[medic86]

Just looked it up. If the molecule can be made from rotation around a single bond (such as what you drew), it's a conformational isomer and not a stereoisomer (such as enantiomers and diastereomers).

Source (UCLA pdf download link, had to shorten because my phone is acting up): http://goo.gl/qS8tuI

Edit: I'm dumb.

 

[Cyberdyne 101]

Nvm, the question wasn't specifically asking for an enantiomer.

 

[Salt Salt]

OP is correct. People, even faculty, always fail to understand the real definition of stereoisomers. (Often they think they're synonymous with enantiomers but there are plenty of other mistakes people make when they misunderstand stereoisomers.) It drives me insane.

You should request points back. @mimelim's chart should explain why you're right.

 

[whitemagic]

@medic86 but....conformational isomers are a type of stereoisomer...

Just looked it up. If the molecule can be made from rotation around a single bond (such as what you drew), it's a conformational isomer and not a stereoisomer (such as enantiomers and diastereomers).

Source (UCLA pdf download link, had to shorten because my phone is acting up): http://goo.gl/qS8tuI

 

[Salt Salt]

@medic86 but....conformational isomers are a type of stereoisomer...

Indeed. Look up conformational isomers on Wikipedia---it says right off the bat.

Stereoisomers are just molecules with the same atoms, and same connectivity, but different spatial arrangement. OP, get those 4 points back!

 

[medic86]

Hm. Yep.

Bad question by the professor. If s/he wanted you to draw an enantiomer or diastereomer, s/he should have specified.

 

[Narmerguy]

SDN is not for homework help. I recommend asking these types of questions on some of the many forums dedicated to answering chemistry and physical science questions.