2009/12/2 Craig A. James <[email protected]>: > Noel O'Boyle wrote: >> >> Uncle Al claims no possible SMILES for his chiralanes: >> >> http://www.coronene.com/blog/?p=1128#comment-8794 >> >> Perhaps a worthy challenge for our new stereocode.... > > I'm not sure what the challenge is. The molecule plainly has a distinct > mirror image. Ignoring hydrogens, there are four symmetry classes before > you even take stereochemistry into account. If we number the symmetry > classes 1 (starting in the center) through 4 (the farthest carbons from the > center), then it's easy to see that for class 3, there are left- and > right-handed connections. That difference would propagate to class 2, and > to class 1. > > Why does Uncle Al say it "can't be stereolabeled even in principle"? Am I > overlooking something? > > This is the same idea as a number of other situations we've seen, where the > stereo labelings of one atom are only distinguished by the stereo labels of > other atoms. It's tricky, but not impossible. > > (And who is "Uncle Al"? in real life?)
The name is at the top of http://www.mazepath.com/uncleal/chiralan.htm > Craig > > ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ OpenBabel-Devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/openbabel-devel
