[HN Gopher] New nitrogen products are in the air ___________________________________________________________________ New nitrogen products are in the air Author : apsec112 Score : 29 points Date : 2020-08-23 21:32 UTC (1 hours ago) (HTM) web link (news.yale.edu) (TXT) w3m dump (news.yale.edu) | ttul wrote: | https://www.nature.com/articles/s41586-020-2565-5 | | The activation of abundant molecules such as hydrocarbons and | atmospheric nitrogen (N2) remains a challenge because these | molecules are often inert. The formation of carbon-nitrogen bonds | from N2 typically has required reactive organic precursors that | are incompatible with the reducing conditions that promote N2 | reactivity1, which has prevented catalysis. Here we report a | diketiminate-supported iron system that sequentially activates | benzene and N2 to form aniline derivatives. The key to this | coupling reaction is the partial silylation of a reduced iron- | dinitrogen complex, followed by migration of a benzene-derived | aryl group to the nitrogen. Further reduction releases N2-derived | aniline, and the resulting iron species can re-enter the cyclic | pathway. Specifically, we show that an easily prepared | diketiminate iron bromide complex2 mediates the one-pot | conversion of several petroleum-derived arenes into the | corresponding silylated aniline derivatives, by using a mixture | of sodium powder, crown ether, trimethylsilyl bromide and N2 as | the nitrogen source. Numerous compounds along the cyclic pathway | are isolated and crystallographically characterized, and their | reactivity supports a mechanism for sequential hydrocarbon | activation and N2 functionalization. This strategy couples | nitrogen atoms from N2 with abundant hydrocarbons, and maps a | route towards future catalytic systems. | donaldcuckman wrote: | Hmm | stevespang wrote: | aniline is a potent carcinogen. | WantonQuantum wrote: | I find it interesting that I initially interpreted the headline | "New nitrogen products are in the air" as a story about | pollution. I.e., new nitrogen products (pollutants) have been | detected in the atmosphere. ___________________________________________________________________ (page generated 2020-08-23 23:00 UTC)