SYNTHESIS AND CRYSTAL-STRUCTURE OF 1,2-DI -T-BUTYL-1,2-DIIODODIARSANE(T-C4H9ASI)(2) AND SYNTHESIS OF 1,2,3,4-TETRAKIS(T-BUTYL)TETRAARSETANE (T-C4H9AS)(4) VIA SELECTIVE REDUCTION OF T-BUTYLARSENIC DIIODIDE T-C4H9ASI2

1,2,3,4-Tetrakis(t-butyl)tetraarsetane (t-C4H9As)(4)(4) has been synth esized by reduction of t-butylarsenic (III) diiodide (1) with equivale nt quantities of either Mg, Ca, Zn, Li, or CoCp2 in THF at low tempera tures in high yields. Treatment of 1 with CoCp2 in a molar ratio 1:1 i n n-pentane at -78 degrees C leads to the formation of 1,2-di-t-butyl- 1,2-diiododiarsine (2) (t-C4H9AsI)(2) in 69% yield. The products have been characterized by spectroscopic methods (H-1, C-13-NMR, EI-MS) and elemental analyses. The crystal structure of 2 has been determined by X-ray diffraction methods.