Transfer hydrogenation and transfer hydrogenolysis. VI. Mechanism of hydrogen transfer from indoline to cycloheptene catalyzed by chlorotris(triphenylphosphine)rhodium(I)

Transfer Hydrogenation Including the Meerwein‐Ponndorf‐Verley Reduction

“…It is a square-planar, 16-electron complex, which catalyzes these reactions via different pathways depending on the hydrogen donor. The intermediate rhodium complexes tend to retain a fourcoordinated square-planar configuration, whereas the molecular hydrogen pathway proceeds through an octahedral state [35,[39][40][41][42] (Scheme 20.8).…”

Heterogeneous catalytic transfer hydrogenation and its relation to other methods for reduction of organic compounds

“…In many reductions, a linear increase in rate of reduction with increase in temperature has been observed. 71,82,84,114,115 Often, where comparative reactions can be studied, the transfer of hydrogen from a donor to an acceptor with a homogeneous catalyst requires a higher temperature than with heterogeneous catalysts using the same metal. However, increase in temperature has attendant difficulties in that unwanted reactions may be encouraged, as with overreduction and isomerization.102,105,106 Where these side-reactions are unimportant, increase in temperature of reaction can afford higher yields of product for a given time of reaction.…”

Synthesis and Characterization of Mononuclear Indoline Complexes. Studies of σ and π Bonding Modes

“…Thermolysis of these products ultimately led to dehydrogenation of the indoline ring and formation of a previously characterized 12c η 2 -indole complex of the osmium cluster. RhCl(PPh 3 ) 3 was found to catalyze the transfer hydrogenation of olefins when indoline was the hydrogen donor, and dehydrogenation of a Rh−indoline intermediate was proposed to be the rate-determining step …”