Crystal structure of the cage derivative pentacyclo[5.4.0.02,6.03,10.05,9]undeca-8,11-dione ethylene dithioketal

Abstract

The title pentacycloundecane cage derivative, C13H14OS2, was identified during a thioketalization reaction. The reaction selectively gave the title compound and the product corresponding to bis-ketal was not formed. The title compound exhibits unusual Csp3-Csp3 single bond lengths ranging from 1.495(3) to 1.581(2) and strained bond angles as small as 89.29(12) and as large as 115.11(11)°.