Structural formulas sawhorse

Write structural formulas for substances (one for each part) that fit the following descriptions. Make sawhorse drawings of the substances forwhich conformational problems are involved. 

Fischer projections, 271-272, 292-293, 973-974, 977, 1007, 1056,1103 Lewis dot structures, 12 Newman projections, 90-92, 95 Structural formulas—Cent. of organic molecules, 19—21 sawhorse, 90—91 wedge-and-dash, 26, 28, 91 Structural isomers. See Constituhonal isomers Structural theory, 3... 

When we do conformational analysis, we will find that certain types of structural formulas are especially convenient to use. One of these types is called a Newman projection formula and another type is a sawhorse formula. Sawhorse formulas are much like dash-wedge three-dimensional formulas we have used so far. In conformational analyses, we will make... 

We have indicated how the enantiomers of 2-butanol differ by drawing their structures 5 and 6 (Section 5-ID) in perspective to show the tetrahedral configuration of substituents at the chiral carbon. This configuration also can be represented by the sawhorse or Newman formulas using any one of the several possible staggered conformations such as 5a and 6a or 5b and 6b ... 

Whenever a ring has to be constructed, you should consider the possibility of cycloaddition reactions, especially [4 + 2] cycloaddition by the Diels-Alder reaction. A first glance at 9, written in the usual sawhorse-perspective formula, might lead to overlooking the possibility of constructing the skeleton by [4 + 2] addition, because the compound seems only to be made up of five-membered rings. If the structure is rewritten as 10, the six-membered ring stands out much more clearly ... 

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