Darstellung und Molekülstruktur von 2-Methylthio-1,3,2-benzodithiastibol / Preparation and X-ray Structure of 2-Methylthio-1,3,2-benzodithiastibole
Starting with SbCl3 and 1,2-benzenedithiol, one can easily obtain heterocyclic 2-chloro- 1,3,2-benzodithiastibole [1], which, without isolation, can be treated with a solution of sodium methanethiolate to yield 2-methylthio-1,3,2- benzodithiastibole. Yellow crystals were obtained by recrystallization from acetonitrile. The compound was found to be monomeric in benzene solution.The crystal structure was solved by means of X-ray diffraction methods and could be refined to an R-value of 0.03 with 870 independent reflections observed. The monoclinic unit cell contains 4 formula units, the space group is P21/c. The structure can be compared with that of 2-methoxi-1,3,2-benzodioxastibole, a preliminary report of which has been given [2]. The compounds are, however, not isomorphous. Interactions between neighbouring molecules in the thiastibole seem to be significantly weaker than in the corresponding oxygen compound.