How to Know Which Newman Projection Is Most Stable

The most stable form of the Newman projection is the anti conformation. As in anti conformation the bulky groups are oppositely placed at an angle of 180 0 thereby reducing the steric hindrance between the groups resulting in the stability of the molecule.

Chapter 3 Quiz

Now this conformation this was called the anti-conformation.

. We actually use what amounts to two Newman projections stuck together and we call it a double Newman. So this one is that women bank open according to the name in violation. So knowing that I have to make this into the most stable conform er I know that my Ethel group is gonna be considered the most bulky.

How to use Newman projections to determine the most and least stable conformations of a compound. This is representing that you need to put the largest molecules into where there is the most space so you put the largest molecules on each Carbon the farthest apart. Let me do this in a different-- and you can view this as the second most stable.

A Newman Projection focuses on one specific bond of the molecule and note which atoms are attached to these carbon atoms. Lets say we have a molecule where in the Newman projection the front carbon has a hydrogen methyl and an ethyl and in the back carbon theres a hydrogen something like a S Cl or Br bigger than carbon but only one atom and something like another ethyl or isopropyl. This right here is called the Gauche conformation.

Lets draw one for 1R2R4S-4-chloro-2-iodo-1-methylcyclohexane. C Calculate amount of strains in each conformation. Conformational analysis of propane.

Add an eye with an arrow looking down the carbon-carbon bond being studied. Okay So between my metal my hydrogen and my ethel. While in B and D they.

A-Values are numerical values used in the determination of the most stable orientation of atoms in a molecule conformational analysis as well as a general representation of steric bulk. How do you determine which Newman projection is most stable. In this form the largest substituent coming off the front carbon is exactly 180 o degrees away from the largest substituent on the back carbon.

Therefore done even projection off the most of travel confirmation off the human thing. Option C is eclipsed so definitely high in energy and less stable than rest three conformers. Which Newman projection is the most stable-Therefore option A is most stable because the bulky groups bromine lie opposite to each other and form anti-staggered conformation.

Large groups which are anti to each other have the least energy possible and hence are more stable. It is the most stable. When drawing your Newman projections the most stable conformation will be the Anti conformation which has the two largest parts of the molecule opposite from each other on a Newman projection.

3 -methylpentane viewed along the mathrmC-2-mathrmC-3 bond. The direction is usually shown with an eye symbol. -In the Newman projection the two carbon atoms of ethane the one which is.

Draw your Newman projection about the bond between carbons 3 and 4 in the IUPAC standard numbering system with the projection viewed from the direction of carbon-3. 8 Circle the Newman projection which represents the most stable conformation of CH CHCH CH. Its the most stable because the carbon-- the methyl groups are as far away from each other as possible.

Determine which two carbon atoms are being studied. Anti staggered conformation is more stable as compared to gauche and eclipsed conformations because in it the bulky groups are oppositely placed to each other thus reducing the steric hindrance between the groups resulting in the stability of the molecule. Cyclohexane chair conformations can also be portrayed through a Newman projection but its a little bit different.

44 Votes The most stable one would have the rear hydrogen in between the front methyl and bromine in a staggered conformation to minimize lone-pair- bonding-electron repulsions. While in B and D they are close to each other causing repulsion and less stability. Therefore the two largest substituents on each carbon of the Newman projection are as far apart from one another as possible leading to the least possible.

Chemistry questions and answers. Newman projection practice 1. -Therefore option A is most stable because the bulky groups bromine lie opposite to each other and form anti-staggered conformation.

The most stable low energy conformation is the one in which all six CH bonds are as far away from each other as possible staggered when viewed end-on in a Newman projection. CH3 CH3 CHs CHs CH CH3 CHs H3C CH3 CHs H H3C. Newman Projection of the most stable confirmation for to me tell propane.

8 Circle the Newman projection which represents the most stable conformation of CH CHCH CH. For example for our molecule we can look through the C1-C2 bond even though it can be through any bond. CH3 CH3 CHs CHs CH CH3 CHs H3C CH3 CHs H H3C CHs CHs CHs.

Here the compound in option A is in anti staggered form. Conformational analysis of ethane. The utility of A-values can be generalized for use outside of cyclohexane conformations.

4 Rotate the rear groups on the C2 C3 bond 120 counterclockwise from the Newman projection shown and youll have it. For every Newman projection you need to specify the bond and the direction you are looking at. 495 1849 Views.

Most stable molecule is that one which has the minyan re function between bathrooms. The most stable one would have the rear hydrogen in between the front methyl and bromine in a staggered conformation to minimize lone-pair- bonding-electron repulsions. A Newman projection is a representation of the molecule looking through a C-C single bond.

Which Newman projection of ethane is more stable. Using Newman projections draw the most stable conformer for each of the following. At least the methyls are staggered.

Experiments show that there is a 12 kJmol 29 kcalmol barrier to rotation in ethane. Sighting along the C2-C3 bond. Draw a Newman projection for the most stable conformation of the compound in part b of Problem 233 that is different from the other two compounds.

Begingroup A side note. 4 Rotate the rear groups on the C2C3 bond 120 counterclockwise from the Newman projection shown and youll have it. 2-3 means looking down the carbon 2 and carbon 3 bond.

B Draw a Newman projection of the least stable conformation. Correct option is A Anti staggered conformation is more stable than gauche and eclipsed conformations. Complete step by step answer.

A Draw a Newman projection of the most stable conformation. For the question in title you could just move on with the Newman projections to determine the relative stabilities of various conformers. I dont see why you want to convert the Newman structures to 3d bond line structures for the question and.

DO NOT FORGET TO SUBSCRIBEThis video shows step by step how to draw the most stable confirmation of any molecules.

Quiz 2

Exam 1 Answer Key

Drawing Newman Projections Staggered Eclipsed Orgomadesimple Com