All Questions
Tagged with stereochemistry molecular-structure
26
questions
-1
votes
1
answer
221
views
Why are these structural formulas not isomers of C5H12? [closed]
A Biology textbook question stated that there are three isomers of C5H12, the structural formula of the first two isomers pentane and 2-methylbutane were pictured, the reader was then asked to draw ...
- 9
1
vote
1
answer
285
views
Converting structures into Fisher projections
I am really struggling with converting pyrano/furanosides into their Fisher projection counterparts. Especially when they are drawn like in the shown projection. When do you know to connect the ...
- 11
1
vote
0
answers
313
views
Monochlorination of (R)-2-chlorohexane: Number of possible chiral dichloro products
How many possible chiral dichloro products can be formed when (R)-2-chlorohexane reacted with one equivelent of $\ce{Cl2}$ in the presence of UV radiation (monochlorination only)?
$$\ce{C6H11Cl + Cl2 -...
user124377
-1
votes
1
answer
97
views
Why this structure is diastereomers instead of enantiomers
In this diagram optical isomers has divided in to 2 categories, one is diastereomers and enantiomers. Is the example for diastereomers correct? For me its looks like enantiomers
- 13
2
votes
1
answer
503
views
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
0
votes
1
answer
276
views
Of 2-bromobutan-2-ol and trans-1,2-dimethylcyclobutane which is chiral as well as dissymmetric?
In an examination I was asked to determine the molecules which are chiral as well as dissymmetric. There were four options, and among them, two were achiral, as they had an improper axis of symmetry. ...
- 371
-2
votes
1
answer
339
views
D and L configuration of monosaccharides
I got this question in the last week's test from Organic Chemistry.
I am a bit confused in assigning D and L configuration.
Help me understand the topic of D and L configuration and help with this ...
3
votes
1
answer
3k
views
Odd/Even swap rule for chiral compounds in stereochemistry
I had this question asked in my exam, where I was supposed to find if this pair is a diastereomer:
Now, I have learnt this rule where: Making odd number of swaps in a molecule means they both are ...
- 71
4
votes
1
answer
1k
views
Assigning E–Z configuration for alkenes with cyclic substituent groups [duplicate]
I was taught that according to CIP rules, we must check the priority order for the substituents. But how can we do the same for molecules with cyclic groups as substituents?
How do we compare the ...
- 255
-3
votes
2
answers
938
views
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
1
vote
1
answer
338
views
Does anyone know what program was used to make this molecular structure picture? [closed]
I am a quantum chemistry beginer, and this picture color scheme is classic. I wonder how to make such pictures by myself.
5
votes
0
answers
117
views
Type of chirality in polycyclic compounds
Ignoring whether or not this molecule could exist, is there a name for this type of chirality? This molecule's mirror image cannot be superimposed on itself but there are no chiral centres.
Even ...
- 51
3
votes
3
answers
18k
views
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
votes
3
answers
6k
views
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
3
votes
1
answer
561
views
Number of stereoisomers of polysubstituted cubane
The molecule given below is a substituted cubane.
a) How many stereoisomers exist for this molecule?
b) How many pairs of enantiomers are possible?
How do I calculate the number of stereoisomers? ...
- 203