Axially asymmetric metal alkyls. Part 4. Synthesis and X-ray crystal structure of the tungsten(V) metallabicyclic complex [{W[(2-CH2C6H4)2]2O} 2Mg(C4H8O)4]·CH 2Cl2

Lutz M. Engelhardt, Rocco I. Papasergio, Colin L. Raston, Geoffrey Salem, Allan H. White

Research output: Contribution to journalArticlepeer-review

Abstract

Reaction of the di-Grignard reagent [{Mg(thf)nCl}2{(2-CH2C6H 4)2}], derived from [Mg(anth) (thf)3] (anth = anthracene) and (2-CICH2C6H4)2, with WCI4O in tetrahydrofuran (thf) yields a paramagnetic species, shown by an X-ray diffraction study to be [{W[(2-CH2C6H4)2] 2[graphic omitted]g(thf)4]. Within each molecule the bidentate alkyl ligands have the same chirality, the overall molecular symmetry being approximately 222. A two-fold axis containing the oxo-groups and metal centres is the only crystallographically imposed symmetry. Oxo-groups are trans in the octahedrally co-ordinated magnesium centre [Mg-O(oxo) 2.036(5), 2.029(5) Å; Mg-O(thf) 2.080(3), 2.1 20(5) Å] and occupy an apical position of square-pyramidally co-ordinated tungsten centres [W-01.744(5), 1.726(4) A; W-CH2 2.162(5)-2.191(4) Å]. Important angles of the metallacycles are: CH2-W-CH2 83.7(2), 85.8(2)°; W-CH2 C(aryl)115.3(4)-121.1(4)°; and torsion angles along the biphenyl axes, 52.9 and 63.1°.

Original languageEnglish
Pages (from-to)789-793
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number4
DOIs
Publication statusPublished - 1 Jan 1986
Externally publishedYes

Fingerprint Dive into the research topics of 'Axially asymmetric metal alkyls. Part 4. Synthesis and X-ray crystal structure of the tungsten(V) metallabicyclic complex [{W[(2-CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>)<sub>2</sub>]<sub>2</sub>O} <sub>2</sub>Mg(C<sub>4</sub>H<sub>8</sub>O)<sub>4</sub>]·CH <sub>2</sub>Cl<sub>2</sub>'. Together they form a unique fingerprint.

Cite this