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Tagged with stereochemistry molecules
11
questions
2
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1
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503
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Stereochemical relationship between the given compounds
Are the given compounds enantiomers or diastereomers? Or are they identical? The compound is trans-1,2-dimethylcyclobutane:
My reasoning is that they are identical. They are not mirror images, and on ...
- 371
7
votes
1
answer
416
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Stereoisomers of 1,3,4,6-tetramethylcyclohex-1,4-diene
How many stereoisomers are possible for following compound (1,3,4,6-tetramethylcyclohex-1,4-diene)?
My Approach
the 1,4 methyl groups lie in the plane, whereas 3,6 are possible chiral centers. ...
- 1,409
-3
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2
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938
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Enantiomers or identical structures?
What is the relationship between the following pair of molecules? Is the underlined answer correct? Explain.
I'm getting mixed answers. Some say these are identical molecules. Other say these are ...
- 1
3
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3
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What do (2S,3S) and similar notations mean?
When my textbook is discussing stereoisomers with more than one chiral centers, it's using notation like (2S,3S) being an enantiomer with (2R,3R) and so forth. I understand R and S configuration, and ...
- 195
12
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3
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Which biphenyl is optically active?
Which biphenyl is optically active?
I know that it can never be 1. I don't think it will be 4 either as I read that it should be ortho-substituted biphenyl.
So, when I look at 2 and 3, I can't make ...
- 371
10
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2
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d-Menthol vs dl-menthol: Does an enantiomer and its racemic mixture have different melting points?
I am checking out Wikipedia and it shows a different melting point (m.p.) for l-menthol $(\pu{42 ^\circ C}$ to $\pu{45 ^\circ C})$ vs dl-menthol $(\pu{36 ^\circ C}$ to $\pu{38 ^\circ C}).$
How is ...
- 1,638
4
votes
2
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888
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Why atropisomers are called conformers?
Changing one atropisomer to another requires bond breaking (in some cases the removal and reattachement of steric groups, according to my understanding) so how it is possible that according to IUPAC ...
user35715
5
votes
2
answers
178
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Why is the discovery of chiral molecules in space a big accomplishment?
Today, I came across the discovery of a chiral pair of molecules in interstellar space. I know that a chiral molecule is a molecule that is not superimposable on its mirror image. But why is this ...
- 161
18
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1
answer
5k
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Why six C atoms are usually seen in cyclic compounds?
When it gets to Carbon-based molecules, one very possible structure when there are more than six C atoms is the hexagon; though not mostly perfect, it emphasizes that six Carbon atoms tend to bond ...
- 10.7k
2
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2
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Stereo Isomerism - syn/anti
I was studying the types of stereo-isomerism E-Z, Cis-Trans and then I come across syn-anti stereo-isomerism this one is giving me a bit of fight in understanding, especially where lone pairs are ...
user10153
7
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1
answer
2k
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What is there in this 3D representation of organic molecules I fail to grasp?
I think there's a basic idea I'm missing about 3 Dimensional representation of molecules. I think it may be about converting to Fischer representation. Consider the following two products of ...
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