678. Olefin co-ordination compounds. Part V. Some diene complexes of palladium(II) and their alkoxy-derivatives

Abstract

Compounds of the types [diene PdX,], [(diene*OR),Pd,X,], and [ (diene*OR) , $-toluidine PdCl] have been prepared. Their properties indicate that they have similar structures to those of their platinous analogues. Generally, the compounds are more deeply coloured, more easily formed, more reactive, and less stable than the corresponding platinous compounds. The alkoxy-derivatives are the first strictly organometallic derivatives of palladium to be reported.IN Part IV we recorded the preparation of a number of chelated platinous complexes of the type [diene PtCl,] and their conversion into alkoxy-derivatives of the type [ (diene*OR),Pt,Cl,]. It was interesting to see whether palladium(11) would give similar derivatives and how they compared with their platinum analogues.Stable diene derivatives were obtained from the cyclic diolefins cycloocta-1 : 5-diene, C,H,,, and dicyclopentadiene, ClOH1,, but not from dipentene, C,,H,,, which reduced palladous salts to the metal. The compounds prepared are listed in the Table . Diene complexes of palladium( 11) atzd their alkoxy-derivatives.

1,8-Bis[(dimethoxy)phosphino]naphthalene: A New Bis-phosphonite Ligand with a Rigid C3-Backbone and Unexpected Reaction Chemistry

“…Starting compounds: 1,8-Dilithionaphthalene [35], bis-(diethylamino)chlorophosphane [36], [PdCl 2 (cod)] [37] and [(nor)Mo(CO) 4 ] [38]. Other compounds were commercially available.…”

Synthesis of the complexes [PdCIR(cod)] (R = benzyl, ethyl; cod = 1,5-cyclooctadiene). β-Elimination from [PdCIEt(cod)] to give the η1,η2 and η3 isomers of [Pd2(μ-Cl)2(C8H13)2]

“…Tetraphenyltin and tetrabenzyltin were prepared from SnCl, and the appropriate Grignard reagent. [PdCl,(cod)] was prepared according to the method of Chatt et al (18). NMR spectra were recorded on a Varian XL-300, Varian Unity plus 300, or Bmker ARX-500 spectrometer.…”

Binding Properties of Two Novel Phosphane-Modified Tetrapodants and Their Bimetallic Transition Metal Complexes

“…[25] [3 7] gand 4, an increase in binding affinity of a factor of 2.5 is (PPh 3 ) 2 IrCl(CO), [28] Pd(DBA) 2 , [38] (CH 3 CN) 4 Pd(BF 4 ) 2 , [39] found. The same positive effect on the association constant (COD)PdCl 2 [40] and all the 5-substituted resorcinol derivatives [41] was found for complexes 4(PdCl 2 ) 2 and 4(PdMeCl) 2 , al-were prepared according to literature procedures. (PPh 3 ) 2 PdCl 2 and though the increase in binding affinity is only a factor of (PPh 3 ) 2 PtCl 2 were obtained after refluxing PPh 3 and PdCl 2 or 1.5 for these complexes.…”