Hashed wedge stereochemical

The structure shown as the product in the following reaction is incomplete. Complete the drawing with lx)ld or hashed wedges to show all of the relevant stereochemical relationships. 

As always with stereochemical problems, it is useful to build models. Draw both molecules and their stereochemistry using the hashed-wedged line notation. Then search for symmetry elements mirror planes and rotational axes. 

A molecule editor can draw a chemical structure and save it, for example as a Molfile. Although it is possible to include stereochemical properties in the drawing as wedges and hashed bonds, or even to assign a stereocenter/stereogroup with its identifiers R/S or E/Z), the connection table of the Molfile only represents the constitution (topology) of the molecule. 

Stereochemical configuration is shown with the use of solid wedge and hashed lines. There are some general rules used in CCD to avoid ambiguity ... 

Zig-zag projection A stereochemical projection in which the main chain of an acyclic compound is drawn in the plane of the paper with 180° torsion angles, with substituents above the plane drawn with bold or solid wedges, and hashed lines for substituents behind the plane. 

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