Jonas reagent

Formation of 772-complexes is known for both mono- and bis-phospho-nio-benzophospholides and has been observed (Scheme 18) in the reactions of the cation 23 with Jonas reagent to give the cobalt complex 49 [49], addition of the zwitterion 25 to a Mo-Mo triple bond to afford the dinuclear complex 50 [47], and finally, upon treatment of 26 with copper iodide to yield the complex 51 [46] which is peculiar because of the presence of the same ligand in two different coordination modes. Whereas it is clear that the metal atoms in all complexes supply inappropriate templates for the formation of 77 -complexes, the preference of rf-(,n)- over a possible a-coordina-tion is less well understood [49]. 

Yasuda S, Yorimitsu H, Oshima K (2008) Synthesis of aryliron complexes by palladium-catalyzed transmetalation between [CpFe(CO)2l] and aryl Grignard reagents and their chemistry directed toward organic synthesis. Organometallics 27 4025 027 Jonas K, Schieferstein L (1979) Simple route to Li- or Zn-metalated r -cyclopentadien-yliron-olefin complexes. Angew Chem Int Ed Engl 18 549-550... 

Jonas, Artaki, Zerda and co-workers [68,110,117] have combined Raman spectroscopy, Si NMR, and the molybdic acid reagent technique to monitor the polymerization process of silicate systems as a function of solution pH (1-9) and solvent composition (methanol or methanol plus formamide). Raman and Si NMR investigations were also performed at pressures ranging from ambient to 5 kbar. As in the previously cited examples, it was possible to correlate some of the Raman bands with specific Si resonances. Table 14 lists the assignments of Raman bands observed in the 600-1050 cm" region of the spectrum [110]. 

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