Exercise 4 Return to Index
In Exercise 3 you learned how to use the Atom: tool and the Query: tool to make a model of propane. That was the first stop on our route towards tyrosine, the amino acid precursor in the biosynthesis of dopamine, L-dopa, and norepinephrine. In this exercise you will drive a little further, from propane to propanoic acid. Along the way you will learn how to use two new features of the Molecular Editor control panel of the VMK, the Bond: tool and the Feedback Area & Script Command Field tool.
The following directions assume you have already made a model of propane.
1. From the Molecular Editor control panel select Atom: O.
2. Click on one of the H atoms in one of the CH3 groups in propane.
This converts propane to 1-propanol. Note that if you had clicked on one of the C atoms in one of the CH3 groups, you would have made ethanol rather than 1-propanol
3. Click the Query:name link.
The name 1-propanol appears in both the Jmol window and below the Feedback Area & Script Command Field in the VMK. This is not the IUPAC name for this compound.
4. Type iupac in the Feedback Area & Script Command Field and click the Run Script command.
The name propan-1-ol appears in both the Jmol window and below the Feedback Area & Script Command Field in the VMK.
5. Click on one of the two H atoms remaining on C-1 of 1-propanol.
6. Select Bond:double.
7. Click near the center of one of the two C-O bonds in your model.
Voila! propanoic acid.
Having arrived at propanoic acid, let's linger a little and learn how to measure some of its physical properties. Exercises 5 and 6 should help.