Hydrogenation of nitrogen

Table 3 h NMR Spectral Data for Ring Hydrogens of Nitrogenous Azoles (a) NH Derivatives... 

Hydrogenation of Nitrogen-Containing Multiple Bonds and Reductive Amination... 

HYDROGENATION OF NITROGEN-CONTAINING MULTIPLE BONDS AND REDUCTIVE AMINATION... 

Tetrahydrothiophene, added in a S Co = 2.5 1 ratio diminished the reaction rate to about 1/6 its original value. Tertiary amines such as NEt3 have no significant effect and thus permit the hydrogenation of nitrogen containing ketones. 

Addition of hydrogen to a multiple bond is hydrogenation. It is applicable to almost all types of multiple bonds and is of great importance in synthetic chemistry, particularly in the chemical industry. Probably the most important technical example is production of ammonia by the hydrogenation of nitrogen ... 

The behavior and reactivity of diimide can be understood best by considering the thermochemistry of hydrogenation of nitrogen ... 

The first step is strongly endothermic and is the main hurdle to overcome in the hydrogenation of nitrogen to ammonia. Conversely, the reverse reaction, which is the dehydrogenation of diimide, is strongly exothermic. Therefore we may expect that diimide will have a pronounced tendency to revert to molecular nitrogen. This is in fact so and, at normal temperatures, diimide exists only as a transient intermediate that cannot be isolated. It is extremely reactive and readily transfers hydrogen to carbon-carbon multiple bonds ... 

The asymmetric hydrogenation of nitrogen-free acrylic acids or acrylic acid esters proceeds in a similar enantioselective fashion. For these substrates Rh- and Ru-catalysts are used with the same frequency. 

Hydrogenation of Nitrogen-Containing Functions by Various Transition Metal Clusters... 

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