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What are some of the simplest chiral molecules in biological systems

I have understood generally for a while there is a significant preference in "life" for so-called "left-handed" (chiral) molecules, though I'm reading things now that say "life" sugars are ...
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1answer
80 views

Are Grignards Chiral?

Can Grignards be chiral? I've seen them drawn as ionic structures in class. I've also seen little asterisks on certain positions of Grignards (a common designation of chirality). So this begs the ...
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0answers
22 views

Assign the configurations of the stereo centres in (-)-menthol and (+)-neomenthol?

I have to assign R or S to the chiral centres in (-)-Menthol and (+)-Neomenthol. The results I got are shown below in the picture. However, when I looked on wikipedia to check my answers they ...
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1answer
39 views

Simple experiments involving enantiomer synthesis

I want to do an experiment to investigate factors affecting the synthesis of chiral molecules. The only problem is, my institution doesn't have much money, and it seems like the chemicals required for ...
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1answer
228 views

What are chiral environments?

I keep seeing the term cropping up, but cannot seem to find a definition for it. My understanding is that it is an environment in which, when the isomers interact with the environment, the two ...
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2answers
30 views

Chirality of heteroatoms

Why is a phosphorus atom with three different substituents chiral, but nitrogen isn't? Nitrogen inverts fast, while phosphorus obviously much slower. How is that explained?
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73 views

Isopropyl and Butyl Groups - Relative Priorities

This does not compute for me: Why would the four-carbon butyl group have a lower relative priority than the 3 carbon isopropyl group? If we compare the carbons one by one between the isopropyl and ...
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1answer
40 views

How to Rotate Chiral Carbon

I know that to correctly assign R,S priorities I have to rotate the above figure until the H is projecting into the page (away from me). However, I don't know how to rotate the H and the rest of the ...
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2answers
18 views

Does the Arrangement of Atoms Matter Around Chiral Carbon?

In other words, are these two structures equivalent?
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1answer
18 views

Configuration, chirality

I'm having trouble assigning priorities for this molecule: I tried assigning priorities with the rules for doubly bonded atoms in mind. I know that the lowest priority group should be going into the ...
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1answer
120 views

Drawing (R)-1,1,2-trimethylcyclohexane

I tried drawing out (R)-1,1,2-trimethylcyclohexane but I can't seem to figure it out. I think I"m getting hung on assigning priorities. I've labeled the chiral carbon with an asterisk. I've also ...
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3answers
58 views

what is the simple enantiomer in the powder form that one can get?

I want to do some experiments on enantiomers. As it involves more calculations of potential energy surfaces, I would like to do this experiment on a simple enantiomer. For example CHBrClF. But this is ...
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2answers
1k views

Why are allenes chiral?

How is this molecule chiral? $(Br)HC=C=CH(Cl)$ My thoughts: I know that chiral carbons have different groups attached to it. Here the end carbons have two different groups and a double bond. But, ...
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1answer
72 views

Liquid crystal current flow

In a liquid crystal cell used for LCD the conductive substrates, usually made of ITO, are in contact with the liquid crystal. The question is: when a voltage is applied to the electrodes to reorient ...
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2answers
365 views

Why only chiral molecules rotate plane polarized light and how does it rotate light?

I have learnt that only chiral or unsymmetrical molecules can rotate plane polarized light. But, why is it so? And how can molecules rotate plane polarized light or what does it actually mean by ...
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1answer
207 views

Molecular chirality and optical rotation

Why does having molecular chirality result in optical rotation? The dissymetry or chirality of molecules translates to the rotation of plane polarized light, the magnitude and direction depending on ...
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1answer
132 views

Racemization of biphenyl compounds

How does the effect of heat and effect of substituents affect racemization of biphenyl compounds?
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0answers
45 views

How would you change the chirality of a compound such that (S,R) becomes (S,S)? [closed]

How would you change the chirality of a compound such that (S,R) becomes (S,S)? That is how would you synthesise a compound from its diastereomer?
4
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1answer
570 views

If I have a chiral substrate, should I always assume that both enantiomers are present?

Considering the Sn1 reaction of (S)-2,3-dimethyl-3-pentanol, knowing that this molecule has a chiral carbon, should I always assume that both enantiomers are present, and therefore the products of a ...
4
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1answer
6k views

What does the “D” group represent on a chiral center?

I am trying to figure out the configuration for this chiral carbon to answer a homework question, however they arbitrarily include a "D" group as shown in the image. My guess is that it is some higher ...
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1answer
127 views

Is there a simple way to get the circular dichroism of a molecule from it's structure?

Are there any heuristics to get the relative absorbtion of left and right circularly polarized light by a molecule from its molecular structure? Is it even possible to predict which polarization is ...