Wedge-hash or wedge-dash diagrams are the most common representation used to show 3D shape as they are ideally suited to showing the structure of sp 3 hybridised tetrahedral atoms. Wedge-and-dash meaning chemistry A method of representing the three-dimensional structure of a molecule in which solid lines represent bonds in the plane of the image wedges represent bonds towards the viewer and dashed lines represent bonds away from the viewer.
In the structure above the alcohol on the second carbon is behind the page.
Wedge and dash. It is as if we had wrapped the chain around a cylindrical tube. This is not a universal solution though because the wedge and dash representation is relative and depends on the direction we are looking from. Alkenes or sp systems eg.
The wedge and dash representations of stereochemistry can often become cumbersome especially for large molecules which contain a number of stereocenters. In this notation two bonds are drawn in the plane of the page sticks one bond is drawn coming toward you out of the page wedged and one bond is drawn going away from you behind the page dashed. And the dash means that it is going directly away from you straight behind the paper.
The wedge and the dash are in the same plane just in opposite directions. Solid lines to represent bonds that are in the plane of the paper. When you flatten the structure onto the surface of the cylinder you get the Fischer projection of D-glucose.
In general the easiest way to draw the enantiomer of a given molecule is to simply redraw the compound replacing all dashes with wedges and all wedges with dashes. When drawing wedge-dash it is a good idea to visualise the tetrahedral arrangement of the groups and try to make the diagram fit this. There are two wedge and two dash lines which may look strange to you since we always have one of each and then the two solid lines but it is okay-it all depends on the direction we are a looking at the molecule.
So weve drawn everything out and notice when you have a tetrahedral carbon an SP3 hybridized carbon you have this pattern you have this pattern of two bonds in the plane of the paper and one wedge and one dash so thats how were representing our tetrahedral geometry around those carbons around those SP3 hybridized carbons. The wedges are now on the right and the dashes are on the left. Wedge-dash diagrams Usually drawn with two bonds in the plane of the page one infront and one behind to give the molecule perspective.
A wedge and dash projection is a drawing a means of representing a molecule in which three types of lines are used in order to represent the three-dimensional structure. The wedge and dash model is used for picturing the 3D molecule. There are three types of bonds in the wedge and dash notations as shown in figure.
When drawing a wedge-dash structure we imagine that we are looking at a molecule side-on. Its a 2d representation of where the atoms or molecules are in 3d space. It uses a wedge to show a bond coming out of the paper or up and a dash to show a bond going into the paper or down.
In organic chemistry wedge and dash projections are used to represent three-dimensional structures of compounds on two-dimensional papers. Anything with just a normal line between atoms is in the plane of the paper or screen wedged lines they look like black filled in triangles means that bond is coming out towards you and dashed lines means the bond is going away from you 1 vote. For example consider how the molecular models of ethane propane and butane below match up with their respective wedge-dash structures.
A wedge means it is coming towards you picture straight out of the paper. They are rarely needed for sp 2 eg. Solid lines to represent bonds that are in the plane of the paper Dashed lines to represent bonds that extend away from the viewer.
Wedge-and-dash uncountable chemistry A method of representing the three-dimensional structure of a molecule in which simple lines represent bonds in the plane of the image wedge-shaped lines represent bonds towards the viewer and dashed lines represent bonds away from the viewer. These lines show the groups or atoms connected in the plane of the paper. A wedge and dash projection sometimes spelled wedge-and-dash is a drawing a means of representing a molecule in which three types of lines are used in order to represent the three-dimensional structure.
The central atom is always assumed to be in the plane of the paper. The latter also called a wedge-and-dash representation is the easiest way to sketch the structure of a molecule in three dimensions. It shows which atoms are above and below the plane of the paper by using wedges and dashes respectively.
An alternative way to represent stereochemistry is the Fischer Projection which was first used by the German chemist Emil Fischer.