NDLI: Coordination chemistry of cis,cis and trans,trans 1,1′-[1,2-phenylenebis(methylene)] bis(2,2,3,4,4-pentamethylphosphetane)

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Coleman, Dennis Edwards, Peter G. Newman, Paul D. Kariuki, Benson M.
Description	Author Affiliation: Coleman D ( School of Chemistry, Cardiff University, Cardiff, UK CF10 3AT.)
Abstract	The cis,cis (5) and trans,trans (9) forms of the bidentate ligand 1,1′-[1,2-phenylenebis(methylene)] bis(2,2,3,4,4-pentamethylphosphetane) have been prepared from common precursors using two separate synthetic routes. The cis,cis isomer is attained selectively through the direct reaction of two mol equivalents of 2,2,3,4,4-pentamethylphosphetane with α,α′-dibromo- o-xylene in acetone . Protection of the 2,2,3,4,4-pentamethylphosphetane with $BH_{3}$ and conversion to the lithium phosphido - borane prior to adding the α,α′-dihalo- o-xylene leads to the isolation of the trans,trans isomer of 1,1′-[1,2-phenylenebis(methylene)] bis(2,2,3,4,4-pentamethylphosphetane) . Both isomers have been fully characterised by spectroscopic and, in the case of the all-cis isomer, single-crystal X-ray methods. The two isomers have been coordinated to Mo(0) to give complexes of the type cis-Mo(CO) $_{4}(L)$ . The solid state structures of $cis-Mo(CO)_{4}(5),$ 10, and $cis-Mo(CO)_{4}(9),$ 12, have been determined by single-crystal X-ray methods and reveal significant differences between the two forms, most notably in the chelate bite angle which is 100.68(18)° in 10 compared to 88.12(2)° in 12. Ligand 5 has also been coordinated to Pd( II) and Pd(0) and the structure of the complex $Pd(5)Cl_{2}$ (11) determined by single-crystal methods. The solid-state structure of $Pd(5)Cl_{2}$ reveals a significant tetrahedral distortion from the normal square planar geometry.
ISSN	14779226
Issue Number	16
Journal	Dalton Trans.
Volume Number	39
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2010-04-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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