Axially asymmetric metal alkyls: VIII. The ruthenium metallacycle [Ru{(2-CH2C6H4)2}(PPhMe2)3 and o-metallated [ 6H4(Me)2}X(PPhMe2)3] (X  Cl, Br)

S. David Chappell, Lutz M. Engelhardt, Allan H. White, Colin L. Raston

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Reaction of cis-[RuCl2(PPhMe2)4] with {(TMEDA)Li}2{(2-CH2C6H4) 2} yields the thermally unstable metallacycloheptadiene, [Ru{(2-CH2C6H4)2}(PPhMe 2)3] (1), which in the solid has a distorted square pyramidal structure with the two ligating carbon atoms in the basal plane (mean RuC 2.14 Å), although there is an agostic-H interaction to an o-hydrogen of a phenyl group (2.80 Å) trans to the apical P-centre, and a secondary interaction to one of the β-carbon atoms of the metallacycle (2.63(4) Å) effectively saturating the metal centre. Treatment of trans-[RuCl2(PPhMe2)4] with 2-[(THF) nClMgCH2]C6H4C6H 4Me-2′ in refluxing THF yields the o-metallated product, [Ru{PC6H4(Me) 2}Cl(PPhMe2)3] (2) which has been characterized by NMR spectroscopy, and by an X-ray structure determination for the corresponding bromide, [Ru{PC6H5(Me)2}Br(PPhMe2) 3] (2′).

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalJOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume462
Issue number1-2
DOIs
Publication statusPublished - 14 Dec 1993
Externally publishedYes

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