In a normal demand DielsâAlder reaction, the dienophile has an electron-withdrawing group in conjugation with the alkene; in an inverse-demand scenario, the dienophile is conjugated with an electron-donating group.Dienophiles can be chosen to contain a masked functionality.n a normal demand DielsâAlder reaction, the dienophile has an electron-withdrawing group in conjugation with the alkene; in an inverse-demand scenario, the dienophile is conjugated with an electron-donating group.
A standard echocardiogram or a fetal echocardiogram test usually takes about 30 to 60 minutes. A stress echocardiogram usually takes between 60 and 90 minutes.
Your doctor can use the results of your stress echo test to decide whether you need treatment or additional tests to evaluate the health of your heart. What to Expect. If you are going to have a stress echo test, you will be in the cardiology office for approximately 1 1/2 hours. The stress echo test will take about 30 to 60 minutes of that time. A technician will attach electrodes to your chest and back to monitor your heart function throughout the test.