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Magazine Chapter 3: 44P (page 190)
Use a Newman projection about the indicated bond to draw the most stable conformer for each compound.
(a)
(b)
Short Answer
Step by step solution
Newman projection
Newman projections are often used in drawing conformations. In Newman鈥檚 projection, one views the bond end along the axis of connection. The front carbon is represented by the intersection of bonds, while the rear carbon appears as a circle.
Using Newman projections to draw the most stable conformer
While looking from the direction of the arrow, it can be seen that the front carbon has a hydrogen atom pointing straight up, a methyl group pointing down and to the left, and a hydrogen atom pointing down and to the right. The back carbon has a methyl group pointing straight down, a hydrogen atom pointing up to the left, and an ethyl group pointing up to the right.
While looking from the direction of thearrow, it can be seen that the front carbon has a methyl group pointing straight down, an ethyl group pointing up to the left, and a methyl group pointing up to the right. The back carbon has a hydrogen atom pointing straight up, a hydrogen atom pointing down and to the left, and an ethyl group pointing down to the right.
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