SYNTHESIS, STRUCTURE, AND PROPERTIES OF THE ETA(2) PO-CHELATED MONO(ETHER-PHOSPHINE)RUTHENIUM COMPLEX [CP-ASTERISK-RU(CO)(PO)][BPH(4)]

The 16-electron complex Cp()RuCl(P similar to O) (2; Cp(*) = eta(5)-C (5)Me(5); P similar to O = eta(1)(P)-coordinated ligand) was synthesiz ed by reaction of oligomeric [Cp()RuCl(2)](n) (1) with the basic ethe r-phosphine (C6H11)(2)PCH2CH2OCH3 (O,P) in the presence of zinc. Carbo nylation of 2 afforded. the chloro carbonyl species Cp()RuCl(CO)(P si milar to O) (3), which was converted into the cationic, monochelated c ompound [Cp()Ru(CO)(P boolean AND O)][BPh(4)](4[BPh(4)]; P boolean AN D O = eta(2)(O,P)-chelated ligand) by chloride abstraction with NaBPh( 4). The structure of 4 was elucidated by a single-crystal X-ray struct ural analysis. 4 crystallizes in the monoclinic space group P2(1)/c wi th Z = 4. The cell dimensions are a = 11.739(3) Angstrom, b = 17.620(5 ) Angstrom, c = 22.919(6) Angstrom, and beta = 98.80(2)degrees. The cl eavage of the Ru-O bond was achieved by 2 bar pressure of carbon monox ide, resulting in the formation of the dicarbonyl complex [Cp()Ru(CO) 2(P similar to O)][BPh(4)] (5[BPh(4)]). By treatment of 4 with triphen ylphosphine the mixed-phosphine derivative [Cp()Ru(CO)-(P similar to O)(PPh(3))][BPh(4)] (6[BPh(4)]) was formed. A single-crystal X-ray str uctural determination of 6 shows that it crystallizes in the monoclini c space group Cc with Z = 4. The cell dimensions are a = 25.683(6) Ang strom, b = 15.496(4) Angstrom, c = 15.653(7) Angstrom, and beta = 110. 96(3)degrees.