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Synthesis, structural authentication, and structurally defined metalation reactions of lithium and sodium da-zincate bases (da = diisopropylamide) with phenylacetylene

Clegg, W. and Garcia-Alvarez, J. and Garcia-Alvarez, P. and Graham, D.V. and Harrington, R.W. and Hevia, E. and Kennedy, A.R. and Mulvey, R.E. (2008) Synthesis, structural authentication, and structurally defined metalation reactions of lithium and sodium da-zincate bases (da = diisopropylamide) with phenylacetylene. Organometallics, 27 (11). pp. 2654-2663. ISSN 0276-7333

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Abstract

In a study aimed at developing the diisopropylamido (DA) chemistry of zincates, the new lithium DA-zincate [(TMEDA)·Li(tBu)(DA)Zn(tBu)] (4) has been synthesized by an interlocking cocomplexation approach comprising mixing of its three component chemicals, LDA, tBu2Zn, and TMEDA, in a 1:1:1 ratio in hexane solution. Previously made by transamination from the corresponding TMP-zincate, the known sodium congener [(TMEDA)·Na(tBu)(DA)Zn(tBu)] (2) was also synthesized by this approach, substituting NaDA for LDA. Closely resembling each other, their molecular structures determined by X-ray crystallography can be categorized as contact ion-pair ates of TMEDA-chelated alkali metal cations linked to trigonal-planar dialkyl-Zn anions via bridging DA ligands. Reaction of 4 and 2 with phenylacetylene affords the bimetallic acetylides [{(TMEDA)·Li(CCPh)2Zn(tBu)}2·(TMEDA)] (5) and [{(TMEDA)·Na(CCPh)2Zn(tBu)}2 ] (6), respectively. X-ray crystallographic studies reveal 5 is a pseudodimer (tetranuclear) with two (LiCZnC) rings linked at the Zn atoms by a bridging, nonchelating TMEDA ligand; in contrast 6 adopts a distorted cubane of alternating PhCC and metal (2 Na, 2 Zn) corners. For comparison, the synthesis and crystal structures of the neutral zinc complexes [(TMEDA)·Zn(CCPh)2] (7) and [(TMEDA)·Zn(tBu)(CCPh)] (8), formally components of the ate complexes 5 and 6, are also reported. In addition, the 1H and 13C NMR spectra of 2, 4, 5, 6, 7, and 8 recorded from solutions in C6D6 are disclosed. (Abstract from: http://pubs.acs.org/doi/abs/10.1021/om8001813)

Item type: Article
ID code: 17069
Notes: Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record. http://suprimo.lib.strath.ac.uk/primo_library/libweb/action/display.do?ct=display&doc=SUSFX954925505259&indx=1&mode=Basic&vid=SUVU01&vl(96071691UI1)=all_items&dscnt=0&vl(54032236UI0)=lsr02&srt=rank&ct=facet&frbg=&fctV=include%20only%20journals%20or%20serials&scp.scps=scope%3A(SU)&indx=1&dum=true&dstmp=1271932199458&fctN=facet_fmt&fn=search&vl(freeText0)=Organometallics&tab=local
Keywords: synthesis, structural authentication, structurally defined, metalation, reactions, lithium, sodium da-zincate bases (da = diisopropylamide), phenylacetylene, Chemistry, Physical and theoretical chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Science > Chemistry
Science > Chemistry > Physical and theoretical chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 22 Apr 2010 12:08
    Last modified: 28 Mar 2014 05:16
    URI: http://strathprints.strath.ac.uk/id/eprint/17069

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