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Unformatted text preview: n the Periodic Table , click Lithium and click OK. Point to the leftmost group of atoms in the ring and drag from it to sprout Li: 4. Click Carbon on the Atoms toolbar and then click Draw Chains . Drag in an empty space so that the chain contains 9 elements. When dragging, move the chain so that it is located to the left of the drawn structure not touching it: Note If in the Preferences dialog box (General tab), the Informative Cursor option is selected, you will see the number of elements hang near the cursor when you draw the chain. tool and, on the Atoms 5. Now right-click in the workspace to switch to the Draw Normal . Click the buttons indicated with arrows in the picture below to toolbar, click Oxygen replace them with the oxygen atoms: ACD/ChemSketch Tutorial 27 Drawing More Complex Structures 6. On the Structure toolbar, click the white triangle of the Coordinating Bonds button choose the Coordinating (Dashed Arrow) Bonds button . and 7. Drag from one of the oxygen atoms to the Li atom to connect them with the coordinating bond. As you release the mouse button, the bond appears: If the bond arrow is directed the wrong way, point to the bond so that it is highlighted and click to change the direction. 8. In the same manner, drag from other oxygen atoms to Li to draw other bonds: Note 9. Click Clean Structure to standardize all the bond lengths and angles: O O Li O CH3 CH3
CH3 O O Li To practice the bond drawing, you can try the following structures:
CH3 O O Li O CH3 O CH3 ACD/ChemSketch Tutorial 28 Drawing More Complex Structures Note Even looking as common bonds, coordinating bonds do not affect valences and charges of connected atoms. All the types are coded in the same way, so all the three drawings above describe the same structure. , then click New Page . 10.On the General toolbar, click Save File 3.11 Delocalized Charges and Curves
The delocalized bonds and charges can be used to draw reaction intermediates, delocalized charges and organometallic structures with multicentral coordination. To practice this type of bonds we are going to draw the following structure: Br H H3C CH3 +
1. On the Reference toolbar or from the Table of Radicals, choose Cyclohexane paste it into the workplace. 2. On the Atoms toolbar, click Carbon CH3 groups: and . By dragging from the atoms in the ring, sprout the 3. If Bromine is not available on the Atoms toolbar, click Periodic Table and find it in the table. If it is available—click it. Drag from the upper atom of the ring to sprout a new bond. 4. Click Hydrogen and drag from the same atom to sprout one more bond: ACD/ChemSketch Tutorial 29 Drawing More Complex Structures 5. Activate the Select/Move tool. Hold down SHIFT and click one by one the bonds so that they become selected as shown on the picture below: 6. On the Structure toolbar, click Solid Delocalization Bond bonds: to apply it to the selected 7. Click Increment (+)Charge on the Atoms toolbar, point to the center of the delocalized bonds so that the highlighting appears and click to change the charge to “+”: Note If you want to make the plus sign more prominent, you can change its size by changing the properties as described in Section 3.13 below. Now try to draw the following structure yourself to practice the delocalized bond drawing: H3C
8. On the General toolbar, click Save File CH3
, then click New Page . ACD/ChemSketch Tutorial 30 Drawing More Complex Structures 3.12 More Bond Types
In this section, we are going to draw the following structure that contains undefined double and single stereo bonds which denote that configurations of double bond or chiral center is not known or not taken into account. HO N N CH3 H3C 1. On the Reference toolbar, use either Benzene structures as displayed below: or Table of Radicals to insert two Tip On the Structure toolbar, click Set Bond Horizontally to rotate the inserted templates. 2. On the Atoms toolbar, click Nitrogen the following way: and by dragging and releasing connect two rings in NH NH 3. On the Atoms toolbar, click Carbon below, add one more fragment: and by subsequently clicking the atoms as shown ACD/ChemSketch Tutorial 31 Drawing More Complex Structures 4. On the Atoms toolbar, click Oxygen sprout a group: and drag from the indicated atom left and up to 5. On the Structure toolbar, click the white triangle of the Undefined Stereo Bond display more bond types. Click Undefined Double Stereo Bond indicated bond to replace it with the another type: button to to select it. Click the 6. From the same group of buttons on the Structure toolbar, click Undefined Stereo Bond and click the structure to replace as indicated: As a result, the following structure should be displayed: HO N N CH3 H3C To practice the drawing of other bond types, try to draw the following structures:
• Hollow wedges are used sometimes to describe spatial arrangement of atoms. Hollow bonds are equal to more common up stereo bonds: Cl H3C H CH3 H3C Cl H CH3 • Delocalized and partial order bonds can be used to describe delocalization of double bonds, tautomeric or aromatic structures. O CH3 CH3...
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- Spring '10