Diisopropyl-Imidazol-2-Ylidene Pr2Im

At —78°C (2-propanol/dry ice cooling bath), NH3 (ca. 200 mL) is condensed into a 500-mL one-necked round-bottomed Schlenk flask equipped with an pressure outlet (evolution of H2 and NH3), which is charged with a mixture of the 

In terms of the principal properties (solubility, storage, reactivity), these derivatives resemble the carbenes in part C. 

A CHELATING RHODIUM A-HETEROC YCLIC CARBENE COMPLEX BY TRANSMETALLATION FROM A SILVER-NIIC INTERMEDIATE 

Submitted by CHIN HIN LEUNG, ANTHONY R. CHIANESE, BENJAMIN R. GARRETT,1 CHRISTOPHER S. LETKO,r and ROBERT H. CRABTREE  

l-(t-Butyl)imidazole.8 A 500-mL three-necked round-bottomed flask containing a Teflon-coated stir bar is fitted with a 125-mL addition funnel on one of the side necks. 

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