Hydrogenation dicarboxylic acid imide

C6H3BrN408S 6-bromo-2,4-dinitrobenzenediazonium hydrogen 65036-47-7 465.15 40.546 1,2 6363 C6H3N302 pyrazine-2,3-dicarboxylic acid imide 4933-19-1 338.65 28.626 1,2... 

Hydrogen chloride Dicarboxylic acid monoamides from dicarboxylic acid imides... 

R) - and (S)-l-phenylethylamine to the diethyl esters of fumaric and maleic acid which are carried out by heating the pure compounds, without solvent, to 115-120 °C for three days (see Table 1). The reaction mixtures are then hydrolyzed and hydrogenated to give aspartic acids in high yields (85-87%) but very low optical purities (6.3-12.2%). A number of intermediates and by-products arc isolated, especially amides and imides of the dicarboxylic acids participating in the reaction. This may explain the low overall diastereoselectivity which can be calculated from the low optical rotation of the isolated aspartic acids. However, any discussion of the reaction mechanism remains difficult because the structures of the substrates and products of the actual addition step itself are not known with certainty. It is known that... 

Catalytic hydrogenation of the imide 24 (R = H) over palladium on charcoal results in partial reduction of the pyrazine ring to give the tetrahydro compound 37. The anomalous products 31 and 32 from the reaction of the anhydride of pyrazine-2,3-dicarboxylic acid and hydrazine were presumed to have been formed by reduction of the pyrazine ring by diimide. This could have been formed in situ by oxidation of hydrazine... 

Heat-curable imide resins are prepared by condensation reaction of bismaleimides with dicarboxylic acid dihydrazides. In the reaction, the bismaleimides are coupled with the dihydrazides via a Michael-type reaction between the active primary hydrogen-nitrogen residues and the double bond on the maleimides. 

Sodium hydrogen sulfate Dicarboxylic acid vinyl imides via dicarboxylic acid a-alkoxyalkyl imides... 

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