chem-mystery
lew cary (lcary@chem.unr.edu)
Mon, 2 Mar 1998 16:37:43 -0800 (PST)
Greetings: One of our postdocs coupled the OH end of peg2000 to a
bilirubin derivative. After purification, in cdcl3, good 500MHz proton and
carbon spectra were obtained. All the rubin protons were observable. In
D2O, however the backbone is about 3 Hz, but the bilirubin is broadened
beyone recognition. 75 deg helps a little.
Why is this so bloody broad in water, but not in cdcl3? Cheers,
Lew