Zr-C(30) 100.0(2) C(21)-Zr-Cl 101.54(9) C(30)-Zr-Cl 5.91(14) C(21)-Zr-C(2) 135.48(7) C(30)-Zr-C(2) 96.33(14) Cl-Zr-C(2) 91.35(9) C(21)-Zr-C(1) 116.56(7) C(30)-Zr-C(1) 129.83(14) Cl-Zr-C(1) 124.75(8) C(2)-Zr-C(1) 33.51(6) C(21)-Zr-C(10) 118.63(7) C(30)-Zr-C(10) 122.9(2) Cl-Zr-C(10) 125.69(9) C(2)-Zr-C(10) 84.66(7) C(1)-Zr-C(10) 68.67(7) C(21)-Zr-C(11) 86.90(7) C(30)-Zr-C(11) 126.26(14) Cl-Zr-C(11) 131.81(8) C(2)-Zr-C(11) 115.41(7) C(1)-Zr-C(11) 90.58(7) C(21)-Zr-C(18) 134.57(7) C(30)-Zr-C(18) 89.8(2) Cl-Zr-C(18) 92.65(9) C(2)-Zr-C(18) 86.23(7) C(1)-Zr-C(18) 87.84(6) C(21)-Zr-C(12) 81.80(7) C(30)-Zr-C(12) 95.81(13) Cl-Zr-C(12) 101.65(8) C(2)-Zr-C(12) 137.24(7) C(1)-Zr-C(12) 121.22(6) C(21)-Zr-C(3) 111.16(7) C(30)-Zr-C(3) 81.28(13) Cl-Zr-C(3) 75.39(8) C(10)-Zr-C(3) 116.52(7) C(11)-Zr-C(3) 145.08(7) C(18)-Zr-C(3) 114.16(6) C(12)-Zr-C(3) 167.00(6) C(21)-Zr-C(9) 86.02(7) C(30)-Zr-C(9) 131.99(13) Cl-Zr-C(9) 126.20(8) C(10)-Zr-C(9) 93.36(6) C(11)-Zr-C(9) 101.48(6) C(18)-Zr-C(9) 119.30(6) C(12)-Zr-C(9) 132.08(6) C(21)-Zr-C(4) 83.77(7) C(30)-Zr-C(4) 101.04(14) Cl-Zr-C(4) 95.49(8) C(2)-Zr-C(4) 52.43(6) C(1)-Zr-C(4) 54.11(6) C(10)-Zr-C(4) 122.22(6) C(11)-Zr-C(4) 132.69(7) C(18)-Zr-C(4) 137.92(6) C(12)-Zr-C(4) 159.46(6) C(3)-Zr-C(4) 31.43(6) C(9)-Zr-C(4) 31.76(6) C(19)-Si(1)-C(20) 111.97(11) C(19)-Si(1)-C(1) 113.03(9) C(20)-Si(1)-C(1) 110.26(10) C(19)-Si(1)-C(10) 110.59(10) C(20)-Si(1)-C(10) 113.12(9) C(1)-Si(1)-C(10) 97.07(9) C(21)-Si(2)-C(23) 111.71(10) C(21)-Si(2)-C(22) 112.01(10) C(23)-Si(2)-C(22) 109.69(11) C(21)-Si(2)-C(24) 109.65(10) C(23)-Si(2)-C(24)106.99( 12) C( 22)-Si(2)-C( 24)106.54( 12) C(2)-C(1)-C( 9)104. 8(2) C(2)-C(1)-Si(1) 120.42(14) C(9)-C(1)-Si(1) 130.89( 14) Si( 1)-C(1)-Zr 96.94( 8)107.6(2) C( 5)-C(4)-C( 9) 120.2(2) C( 5)-C( 4)-Zr 123.91( 14) C( 6)-C(5)-C( 4) 119.0(2) C( 5)-C( 6)-C( 7) 121.0(2) C( 8)-C( 7)-C( 6)122.1(2) C( 7)-C(8)-C( 9) 118.5(2) C( 8)-C(9)-C(4) 119.0(2) C(8)-C(9)-C(1) 132.0(2) C(4)-C(9)-C(1) 108.9(2) C(8)-C(9)-Zr 122.69(12) C(11)-C(10)-C(18) 104.9(2) C(11)-C(10)-Si(1) 123.02(13) C(18)-C(10)-Si(1) 127.75(14) C(11)-C(10)-Zr 73.50(10) C(18)-C(10)-Zr 76.66(11) Si(1)-C(10)-Zr 96.64(8) C(12)-C(11)-C(10) 111.0(2) C(12)-C(11)-Zr 77.27(11) C(10)-C(11)-Zr 73.33(10) C(11)-C(12)-C(13) 107.6(2) C(11)-C(12)-Zr 70.70(10) C(13)-C(12)-Zr 77.47(11) C(12)-C(13)-C(14) 132.1(2) C(12)-C(13)-C(18) 107.3(2) C(14)-C(13)-C(18) 120.6(2) C(12)-C(13)-Zr 71.06(11) C(14)-C(13)-Zr 124.16(14) C(18)-C(13)-Zr 70.92(10) C(15)-C(14)-C(13) 118.5(2) C(14)-C(15)-C(16) 121.5(2) C(17)-C(16)-C(15) 121.7(2) C(16)-C(17)-C(18) 119.0(2) C(17)-C(18)-C(13) 118.7(2) C(17)-C(18)-C(10) 132.2(2) C(13)-C(18)-C(10) 109.1(2) C(17)-C(18)-Zr 119.88(12) Si(2)-C(21)-Zr 120.90(9) Si(2)-C(21)-H(21X) 107(2) Zr-C(21)-H(21X) 107(2) Si(2)-C(21)-H(21Y) 106(2) Zr-C(21)-H(21Y) 109(2) H(21X)-C(21)-H(21Y) 106(2) _____________________________________________________________________Table 4: Angles between interatomic vectors [ o ] with e.s.d.s in parenthesis_____________________________________________________________________ Centroid1-Hf-Centroid2 127.3 Cen...

Zeise's salt gets company: 185 years after the report of the well‐known platinum(II) ethylene compound, examples of isolable olefin complexes of its isoelectronic neighbor in the periodic table, gold(III), have been prepared (see picture). The complexes are very susceptible towards nucleophilic attack; there is also structural evidence for AuIII–Ag interactions.

The reaction of [H(OEt 2 ) 2 ][B(C 6 F 5 ) 4 ] with Zn[N(SiMe 3 ) 2 ] 2 , MgBu 2 , and {Mg[N(SiMe 3 ) 2 ] 2 } 2 in diethyl ether proceeds in very high yields to give the salts 4), respectively. The structures of 2 and 4 were determined by X-ray crystallography; the compounds contain distorted-tetrahedral metal centers and are isostructural. [(Et 2 O) 3 ZnCH 2 CH 3 ][B(C 6 F 5 ) 4 ] (1) as well as 2-4 catalyze the ring-opening polymerization of epoxides and -caprolactone. Cyclohexene oxide is polymerized extremely rapidly to high molecular weight materials, while the polymerization of propene oxide gives low molecular weight materials via a cationic mechanism. The zinc species are more stable than their magnesium analogues and show higher productivities. -Caprolactone is polymerized efficiently to high molecular weight polymers.

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