Abstract
Dinitrogen complexes of the type TpR,RCr–N2–CrTpR,R are not the most labile precursors for Cr(I) chemistry, as they are sterically protected from obligatory associative ligand substitution. A mononuclear alkyne complex – TptBu,MeCr(η2-C2(SiMe3)2) – proved to be much more reactive.
Highlights
Dinitrogen complexes of the type TpR,RCr–N2–CrTpR,R are not the most labile precursors for Cr(I) chemistry, as they are sterically protected from obligatory associative ligand substitution
Our interest in the activation of O2 and other small molecules has benefited greatly from the availability of TptBu,MeCo(N2) and [(i-Pr2Ph)2nacnacCr]2(m-Z2:Z2-N2), respectively.[3,4]. While these two molecules differ in the mode of coordination of the designated leaving group, both undergo facile ligand substitution to yield a plethora of compounds incorporating the TptBu,MeCo and (i-Pr2Ph)2nacnacCr fragments.[5,6]
We were interested in the intersection of these two chemistries, and we report the preparation of dinitrogen complexes of various TpCr fragments, which exhibited some notable differences in reactivity
Summary
Dinitrogen complexes of the type TpR,RCr–N2–CrTpR,R are not the most labile precursors for Cr(I) chemistry, as they are sterically protected from obligatory associative ligand substitution. A mononuclear alkyne complex – TptBu,MeCr(g2-C2(SiMe3)2) – proved to be much more reactive.
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