84098-00-0Relevant academic research and scientific papers
DI-μ-CHLORODICHLOROBIS(η4-TETRAKIS-p-METHOXYPHENYLCYCLOBUTADIENE)DIPALLADIUM: X-RAY STRUCTURE DETERMINATION, SPECTROSCOPIC PROPERTIES, AND REACTIONS WITH NUCLEOPHILES
Ridgwell, Philip J.,Bailey, Pamela M.,Maitlis, Peter M.
, p. 373 - 386 (1982)
Reaction of bis-p-methoxyphenylacetylene (An2C2) with Na2 gave 4-An4C4Pd)2Cl3>0.5 which with HCl gave (6).The complexes (Y=Br, I, NCS, or NCO) were obtained by metathesis.Reaction of 6 with NaN3 gave the η3-cyclobutenyl complex Na(N3)Cl>.With other nucleophiles OR- (6) gave the dinuclear η3-cyclobutenyl complexes 2Cl2> (R=H, Me, Et, Pri or COCH3); AgPF6 in the presence of L (MeCN, Bu-tNC, Me2NC, Me2C2 or py) gave 4-An4C4Pd)2Cl2L2>2 and in the presence of bipy gave 4-An4C4Pd(bipy)Cl>PF6.The X-ray crystal structure of the dinuclear complex 6 showed each Pd to be η4-coordinated to a square planar cyclobutadiene, and bound to three chlorines (two bridging and one terminal).The far IR spectra provide a useful guide to the structures of many of these complexes, but 6 is remarkable in that the spectrum between 200 and 300 cm-1 changes dramatically on grinding.
