creators_name: Canty, AJ
creators_name: Honeyman, RT
creators_name: Skelton, BW
creators_name: White, AH
creators_id: allan.canty@utas.edu.au
creators_id: 
creators_id: 
creators_id: 
type: article
datestamp: 2008-02-01 01:27:37
lastmod: 2008-07-18 10:29:54
metadata_visibility: show
title: Synthesis of 1,1-Bis(pyrazol-1 -ylmethyl)ethene and the
Structure of a Trimethylplatinum(1V) Derivative containing
an Eight-membered Chelate Ring
ispublished: pub
subjects: 259901
full_text_status: restricted
abstract: The bidentate pyrazole-donor ligand 1,1-bis(pyrazo1-1-ylmethyl)ethene, [(pz)CH2]2C=CH2, may be synthesized in high yield on reaction of the readily obtained potassium pyrazolide with commercially available (CICH2)2C=CH2. Reaction of the ligand with [{PtMe2(SEt2)}2], followed by addition of iodomethane, gives the platinum(IV) complex fac-[PtlMe3{[(pz)CH2]2C=CH2-N,N'}]. Proton NMR and X-ray structural studies show that the eight-membered chelate ring PtNNC3NN adopts a configuration in which the pyrazole rings are in different environments, forming angles of 26.0(3) and 38.2(3) with the 'PtC2N2' mean plane. Thus, the four methylene protons are also in different environments, as are the PtMe groups trans to pyrazole groups. The eight-membered chelate ring is fluxional, undergoing inversion with DGact ~ 15 kcal mol-1 (~63 kJ mol-l) at 10 C.
date: 1992
date_type: published
publication: Journal of the Chemical Society, Dalton Transactions
volume: 18
pagerange: 2663-2665
id_number: 10.1039/DT9920002663
refereed: TRUE
issn: 1477-9226
official_url: http://dx.doi.org/10.1039/DT9920002663
citation: Canty, AJ and Honeyman, RT and Skelton, BW and White, AH (1992) Synthesis of 1,1-Bis(pyrazol-1 -ylmethyl)ethene and the Structure of a Trimethylplatinum(1V) Derivative containing an Eight-membered Chelate Ring. Journal of the Chemical Society, Dalton Transactions, 18 . pp. 2663-2665. ISSN 1477-9226
document_url: http://eprints.utas.edu.au/2936/1/Dalton1992_2C_2663.pdf