X-Ray molecular structure of 3-oxa-7,9-dithia- and 9-oxa-3,7-dithia-bicyclo[3,3,1]nonanes
Abstract
X-Ray crystal structure analysis shows that 3-oxa-7,9-dithiabicyclo[3,3,1]nonane (I) exists in the double-chair conformation, but that 9-oxa-3,7-dithiabicyclo[3,3,1onane] exists in the boat–chair conformation; this phenomenon is discussed in term of lone pair repulsions.