ISSN:
1434-1948
Keywords:
Boranes
;
Ruthenium
;
Sandwich Complexes
;
Diboroles
;
Triple-decker
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The addition products of lithium alkyls and the pentaalkyl-2,3-dihydro-1,3-diborole derivatives 5a-f react with [{(C5Me5)RuCl}4] and [{(C5Me4Et)RuCl}4] to form the violet sandwich compounds 2*c-f and 2∧c, f. These formally 16 VE complexes are in fact electron-poor 18 VE species, because a high-lying combination of σ(B-C) orbitals interacts with the dxz orbital of the Ru atom. Addition of tert-butyl isocyanide to 2*a, or 2*d leads to the isonitrile complexes 6*a, and 6*d, as indicated by the spectroscopic data and X-ray structure analyses. At low temperature the interaction of 2*a, c, or e with H2 yields the classic dihydride complexes 7*a, c, and e, respectively, which have been studied by NMR. Oxidative addition of H3B·THF to the ruthenium atom of 2*a or c, followed by a reductive elimination of H2 and migration of the boranediyl group gives the yellow closo-RuC3B3 ruthenacarboranes 8*a and 8*c, respectively. The reaction of [(C2H4)2RhCl]2 and 2*c generates the tetranuclear complex 9*c.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
