Continuous-flow hydrogenation of aromatic nitro compounds was successfully performed by using polysilane-supported palladium catalysts to afford the corresponding amino compounds in high yields. Productivity was high, and a wide variety of nitro compounds were applicable under the continuous-flow conditions. It is noted that no leaching of palladium was observed by inductively coupled plasma analysis.
Polysilanes have been synthesised as potential precursors for silicon carbide fibres. One critical property of these precursors
is the ceramic yield obtained on pyrolysis. This is determined by TG and typical curves are shown. A second important property
is the suitability for spinning a fine, flexible fibre. The characterisation of ‘spinnability’ is subjective but one of the
aims of this work has been to define more precisely the temperature at which to attempt spinning. This has involved the use
of TMA and DSC.
” B. Gutmann , T. N. Glasnov , T. Razzaq , W. Goessler , D. M. Roberge , C. O. Kappe Beilstein Journal of Organic Chemsitry 2011 , 7 , 503 – 517 .
“ Continuous flow hydrogenation using polysilane-supported palladium
Authors:Bartholomäus Pieber, Kerry Gilmore, and Peter H. Seeberger
passed through two consecutive packed-bed reactors containing a chiral calcium catalyst for the asymmetric Michael-type addition. Subsequent hydrogenation of the nitro group over a palladium catalyst supported on carbon and polysilane resulted in the