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Supplementary Material Available: Details of the X-ray diffraction experiment, complete listings of bond lengths and bond angles, table of positional and thermal parameters, listings of F0 and Fc, and general temperature factor expressions for complex 2a (25 pages). Ordering information is given on any current masthead page.

Tetramethyldiphosphine and tetramethyldiarsine undergo an exchange reaction to give (dimethylarsino)dimethylphosphine.The equilibrium constant at 25°C in benzene is found to be 0.26. Similarly, mixtures of tetramethyldistibine with tetramethyldiarsine or tetramethyldibismuthine are partially converted to (dimethylarsino)dimethylstibine or (dimethylbismuthino)dimethylstibine, respectively. The thermochromic arsinostibine, l-(2,5-dimethylarsolo)-2,5_dimethylstibole, has been prepared by a similar reaction.

Tetramethyldipnictogens Me,E, (E = P, As, Sb, Bi) undergo exchange reactions with dimethyldichalcogenides Me, A 2 (A = S, Se, Te) to produce the corresponding (dimethylpnicto)methylchalcogenides M%EAMe. These compounds have been characterized by NMR, Raman and mass spectroscopy. IntrctductIon In the course of a study of element-element bonding of tetraorganodipnictogens R,E, (E = P, As, Sb, Bi) [l-3] we became interested in obtaining related compounds containing hetero element-element bonds. In a previous paper we reported that interpnictogen compounds MqEE'Me, could be prepared by the exchange reaction of the corresponding tetramethyldipnictogens (eq. 1) [4].