FORMATION AND STRUCTURE OF LI(THF)(2)[ETA (2)-((T)BU(2)P)(2)P], LI(TMEDA)[ETA(2)-((T)BU(2)P)(2)P], LI(THF)(2)[ETA(2)-((PR2P)-PR-I)(2)P], LI(THF)(2)[ETA(2)-(ET(2)N)(2)P-P-P(T)BU(2)], LI(THF)(2)[ETA(2)-((T)BU(2)P-P-(PPR2)-PR-I] AND ((T)BU(2)P)(2)P-SIME(3)

The formation and crystal structures of the compounds ((t)Bu(2)P)(2)P- SiMe(3) 1, Li(THF)(2)[eta(2)-((t)Bu(2)P)(2)p] 2, Li(TMEDA)[eta(2)-((t) Bu(2)P)(2)P] 3, Li(THF)(2)[eta(2)-((Pr2P)-Pr-i)(2)P] 4, Li(THF)(2)[eta (2)-(Et(2)N)(2)P-P-P(t)Bu(2)] 5 and Li(THF)(2)[eta(2)-((t)Bu(2)P-P-(PP r2)-Pr-i)] 6 are reported. Compounds 3-6 are formed by reacting the co rresponding silylated triphosphanes with (n)BuLi: 2 and 3 result from ((t)Bu(2)P)(2)P-SiMe(3) 1, 4 from ((PrP)-Pr-i)(2)P-SiMe(3), 5 from (Et (2)N)(2)P-P(SiMe(3))-P(t)Bu(2) and 6 from (t)Bu(2)P-P(SiMe(3))-(PPr2)- Pr-i. 1 crystallizes in the orthorhombic space group P2(1)2(1)2(1) (no . 19) with a = 910.87(7)pm, b = 1132.5(1) pm, c = 2373.5(2) pm (determ ined at 90 K). The structure determination of 2 was performed at 293 K and 200 K, respectively. 2 crystallizes in the monoclinic space group P2(1)/n (no. 14) with a = 1069.7(3) pm, b = 1802.5(3) pm, c = 1604.0( 7) pm, beta = 98.11(2)degrees (200 K); 3 also in P2(1)/n (no. 14) with a = 904.3(2)pm, b = 1936.4(5) pm, c = 1653.2(3) pm, beta = 94.52(1)de grees (200 K). 4 crystallizes monoclinically in C2/c (no. 15) with a = 1650.0(5) pm, b = 945.6(3) pm, c = 1779.8(5) pm, beta = 108.81(2)degr ees (200 K); 5 in P2(1)/n (no. 14) with a = 939.4(5) pm, b = 1736.8(6) pm, c = 1943.3(7)pm, beta = 98.17(4)degrees (200 K). All compounds co ntain Z = 4 molecules in the unit cell. The H-1, P-31 and Li-7 NMR spe ctra of 2-6 are discussed.