Abstract
The complex (η 5-C 5H 5)W[C(Ph)C(CMe 3)C(Ph)]Cl 2 has been studied by X-ray diffraction techniques. This complex crystallizes in the centrosymmetric monoclinic space group P2jt] 1/ c (C 2 h 5; No. 14) with a 9.8594(38), b 10.8206(17), c 20.580(11) Å, β 92.882(38)°, V 2192.8(15) Å 3 and D(calcd) 1.72 g cm −3 for mol. wt. 567.2 and Z = 4. Diffraction data were collected with a Syntex P2 1 diffractometer and the structure was solved and refined to R F 3.1% and R w F 2.6% for all 2599 data with 2θ = 4.5–45.0°. The tungsten atom has a coordination environment resembling a “four-legged piano stool”. The tungstenacyclobutadiene system is non-planar and localized, individual distances around the WC 3 system being (cyclically) WC(6) 1.943(5), C(6)-C(1) 1.485(7), C(1)C(13) 1.372(8), and C(13)W 2.132(5) Å; the W…C(1) distance of 2.339(5) Å is essentially non-bonding.
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