Databases for Chemists and Chemical Engineers
Chemical Abstracts
SciFinder Scholar |
CAS Online |
Standard Abbreviations |
Index Guide |
Guide to CASREACT |
Structure Searching with STN Express
Structure searching in CAS Online using STN Express: An introductory workshop
Building structures: Drawing the carbon skeleton
- Use Template (menu bar choice)
- Use Pencil tool
- Macintosh version: When the pencil is positioned on an atom, the body of the
pencil is black. When the pencil is on a bond, the eraser of the pencil is
black.
- Windows version: When the pencil is positioned on an atom, the letter “A”
appears in the pencil. When it is positioned on a bond, a line appears in the
pencil.
- Use Chain tool
- Use Ring tool
| To Specify |
Enter |
Examples |
| Size of Ring |
Number to specify ring size |
6 |
| Fused Rings |
Enter size of ring. Specify direction of fusion by entering U for Up and D for Down |
66
66U6 |
| Alternating Bonds |
Mac version: hold down Apple Key when positioning the ring |
Tip: To eliminate the possibility of inadvertently superimposing two nodes on top of
one another, choose Display in the menu bar and choose the Dot Atoms display format.
