Reactions of Acetylide Clusters Cp*WRe2(CO)9(CCR) [R = Ph, C(Me):CH2, and Cyclohexenyl] with Thiophenol. Formation of WRe2 Thiolate Alkyne and Vinylalkylidyne Derivatives
作者:Jiunn-Jang Peng、Shie-Ming Peng、Gene-Hsiang Lee、Yun Chi
DOI:10.1021/om00002a009
日期:1995.2
Heterometallic acetylide cluster Cp*WRe2(CO)(9)(CCPh) (1a) reacted with thiophenol in refluxing toluene to afford two acetylene clusters Cp*WRe2(CO)(8)(mu(3)-SPh)(CH=CPh) (2a) and Cp*WRe2(CO)(7)(mu-SPh)(CH=CPh) (3a). Their structures were determined by X-ray diffraction studies. Crystal data of 2a: space group I2/c; a = 20.017(4) Angstrom, b = 11.869(6) Angstrom, c = 29.622(5) Angstrom, beta = 98.50(2)degrees, Z = 8, R = 0.039, and R(w) = 0.032 for 3279 observed reflections with I > 2 sigma(I). Crystal data of 3a: space group P2(1)/n; a = 10.839(5) Angstrom, b = 17.112(4) Angstrom, c = 16.581(7) Angstrom, beta = 94.16(3)degrees, Z = 4, R = 0.042, and R(w) = 0.042 for 3323 observed reflections with I > 2 sigma(I). The structure of 2a possesses a V-shaped core geometry with a face-bridging thiolate ligand and a phenylacetylene adopting a mu(3)-eta(2) (parallel to) mode, whereas cluster 3a contains a triangular skeleton with an edge-bridging thiolate fragment and a unique mu(3)-eta(2)(perpendicular to) phenylacetylene ligand. Heating of 2a afforded 3a via elimination of a CO; the latter process could be partially reversed by addition of a CO atmosphere. Upon snitching to vinylacetylide clusters Cp*WRe2(CO)(9) (CCC=CH(CH2)(4)) (1c) and Cp*WRe2(CO)(9)(CCCMe=CH2) (1d), only the alkylidyne clusters Cp*WRe2(CO)(7)(mu-SPh)(2) (CCH=C(CH2)(5)) (4a) and Cp*WRe2(CO)(7)(mu SPh)(2)(CCH-CMe(2)) (4b) were obtained. Crystals of 4a are triclinic, space group P $($) over bar$$ 1; a = 10.149(1) Angstrom, b = 12.151(4) Angstrom, c = 17.442(2) Angstrom, alpha = 84.79(2)degrees, beta = 76.40(1)degrees, gamma = 70.39(2)degrees, Z = 2, R = 0.023, and R(w) = 0.022 for 4557 reflections with I > 2 sigma(I). Clusters 4, exhibiting an open triangular arrangement, possess two thiolate ligands and an asymmetric vinylalkylidyne weakly bridging a W-Re edge (mu-W-C = 1.858(7) Angstrom, mu-Re-C = 2.339(6) Angstrom).