1987, 109, 4106-4107 the other transition-metal complexes. 2 However, it was quite unknown whether cyclooligomerization of cumulenes bearing sulfur substituents occurs by a transition-metal complex catalyst. Recently we succeeded in the synthesis of tetrakis (1, 3- dithiol-2-ylidene) cyclobutane, a promising electron donor for organic metals, by Ni (0)- catalyzed reductive cyclodimerization of 2, 2'-(1, 2-dibromoethanediylidene) bis (1, 3- ...
![2-[2-(1,3-benzodithiol-2-ylidene)-1,2-dibromoethylidene]-1,3-benzodithiole Structure](https://image.chemsrc.com/caspic/433/108591-96-4.png)