Help Drawing Newman Projections

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ntruong2H
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Help Drawing Newman Projections

Postby ntruong2H » Mon Mar 13, 2017 6:57 pm

The problem is: draw the staggered conformation for rotation about the C1-C2 bond in 2-methylbutane. Can someone please explain how we would go about drawing this? Thank you.

Marissa Petchpradub 2F
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Re: Help Drawing Newman Projections

Postby Marissa Petchpradub 2F » Mon Mar 13, 2017 7:31 pm

I believe you would first draw the staggered Newman Projection; then on the 3 bonds connected to carbon 1 (the front carbon on the Newman Projection) you would write H. For the 3 bonds connected to carbon 2 (the carbon in the back which is not visible on the Newman projection), you would write H for one, CH3 for the second to represent the methyl substituent, and CH2CH3 on the third to represent the rest of the main carbon chain (butane in this case).

Hope this helps!

MariaReina_Garcia_3E
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Joined: Wed Nov 18, 2015 3:00 am

Re: Help Drawing Newman Projections

Postby MariaReina_Garcia_3E » Mon Mar 13, 2017 9:30 pm

It's a bit difficult to explain. First draw 2-methylbutane (4 carbon chains and a CH3 in the second carbon, also draw all of your H molecules attached to the carbons). The C1-C2 refers to where the the molecule would be split for the Newman projection. The first three molecules would be.. so CH3-CH(CH3) would be at the front, and the CH2CH3 would be in the back. Marissa explains the second part better

Marissa Petchpradub 2F wrote:I believe you would first draw the staggered Newman Projection; then on the 3 bonds connected to carbon 1 (the front carbon on the Newman Projection) you would write H. For the 3 bonds connected to carbon 2 (the carbon in the back which is not visible on the Newman projection), you would write H for one, CH3 for the second to represent the methyl substituent, and CH2CH3 on the third to represent the rest of the main carbon chain (butane in this case).

Hope this helps!


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