Jump to content

Formation of sucrose from glucose and fructose

Recommended Posts

This is my first post here, so hello everyone. Making my foray into the wonderful world of science via an Access course (read A-level for mature students) in Marine and Environmental Science. See you at the lab in a few years' time. ;)


Anyway, onto the question. Working away on a biochemistry module at the moment (RH5/3/WW/003). Trying to rationalise to myself the formation of sucrose from glucose and fructose, as you may have determined from the thread title.


I found this website: http://dl.clackamas.edu/ch106-07/sucrose.htm


What I don't understand is their explantion of how b-D-fructose in standard orientation, shown here:




...gets flipped to b-D-fructose in inverted orientation:




Are these two separate isomers? I've tried mentally rotating the first molecule in all three dimensions but still can't find a way to do it so that it ends up looking like the second one. I'd appreciate an explanation by more learned people.





Link to comment
Share on other sites

  • 2 months later...

Draw a line that goes through the furan ring Oxygen atom and splits in half the bond that connects Carbon atoms 3 and 4, that would be the ones closest to you and each one of them is conected to a -OH group.




Now spin the top molecule by 180 degrees and you will get the one on the bottom. But this time C4 will be to your right and C3 to your left.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.