ChemInform Abstract: Reactions of Bis[1,2-bis(dimethylphosphino)ethane]bis(dinitrogen)chromium(0) and -bis(carbonyl)chromium(0) with Acids and Oxidizing Agents.

ChemInform Abstract

The interaction of (II) with HCl gives the eight-coordinate Cr(IV) species (I) (the only other eight-coordinate Cr(IV) species (III) has been characterized previously), whereas CF₃COOH gives (IV). Protonation of (II) with CF₃SO₃H in MeCN or EtCN leads to the Cr(II) complex (V). The reaction of (II), (I), or (VII) with MeI or I2 yields trans-Cr(III) Compounds (VI) or (VIII). A seven-coordinate trans-Cr(O) complex (XI) (the location of H is discussed) is obtained by treatment of (IX) with CF₃SO₃H, while treatment of (IX) with one equiv. of AgSO₃CF₃ yields the Cr(I) complex (X). X-Ray structures of the following compounds have been determined: (IV) crystallizes in the space group P4n2 with Z=2, (Va) in the space group PI, Z=2, (Vb) in the space group P2₁/c, Z=2, (VIIIb) in the space group C2/c, Z=4, (X) in the space group P2₁/c, Z=4, and (XIb) in the space group P2₁/n with Z=4.