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Addition of boranes to N-aryl-salicylaldimines takes place initially at the reactive phenolic O–H bond to give an activated boron-containing imine and dihydrogen. In some cases a subsequent intramolecular hydrogenation step is observed and the CN imine bond is reduced to the corresponding amine. Reactions with dimesitylborane in THF are unique in that the reduced amine product is the major product observed in solution. [ABSTRACT FROM AUTHOR]

The indenyl compound (η5-C9H7)Rh(coe)2(1, coe = cis-cyclooctene) has been prepared as a thermally stable alternative to the diethylene derivative (η5-C9H7)Rh(η2-H2CCH2)2. Compound 1reacts with unsaturated phosphines Ph2PR (R = CHCH2, 2; CH2CHCH2, 3; and CC-tert-Bu, 4) to give complexes of the type (η5-C9H7)Rh(Ph2PR)2, where bonding occurs through the phosphorus atom. Addition of Ph2PCCPPh2to 1gave the dimer [(η5-C9H7)Rh(μ-Ph2PCCPPh2)]2(5). Solution and solid state data showed that these new phosphine complexes have only a moderate amount of distortion within the indenyl ring. These compounds were found to catalyse the hydroboration of vinylarenes and the first example of an internal hydroboration of diphenylvinylphosphine has been reported. [ABSTRACT FROM AUTHOR]