[zhangyida]

what does 1,3-syn-diaxial arrangemen mean?    thanks for your previous time

[discodermolide]

Do you mean something like this?

Where both substituents are on the same side of the molecule?

p.s. I did not add the chiral label.

[Dan]

Look up 3D conformations of 6-membered rings.

e.g. http://www.chem.qmul.ac.uk/iupac/stereo/A.html#24

[zhangyida]

Do you mean something like this?

Where both substituents are on the same side of the molecule?

p.s. I did not add the chiral label.

yeah,just like this.I  can not understand it well.

[zhangyida]

Look up 3D conformations of 6-membered rings.

e.g. http://www.chem.qmul.ac.uk/iupac/stereo/A.html#24

   thanks!