Base-stabilized formally zero-valent mono and diatomic molecular main-group compounds

Abstract

Various compounds are known for transition metals in their formal zero oxidation state, while similar compounds of main-group elements are recently realized and limited to only a few examples. Lewis...

NHC‐Supported 2‐Sila and 2‐Germavinylidenes: Synthesis, Dynamics, First Reactivity and Theoretical Studies

“…During the last 15 years N-heterocyclic carbenes (NHCs) have been shown to be particularly suitable Lewis-bases for the thermodynamic stabilization of highly reactive maingroup element species [1][2][3][4][5] leading in the case of silicon and germanium to a series of isolable closed-shell, and openshell, multiply-bonded compounds with intriguing electronic structures and a great synthetic potential (Figure 1). [6][7][8][9][10][11][12][13][14][15][16][17][18][19] A particularly intriguing class among them are the NHCsupported ditetrelavinylidenes (NHC)E=SiR 2 (Figure 1), which may be considered as the dismutational isomers of the NHC-supported ditetrelynes RE=SiR(NHC).…”

Carbene chemistry of arsenic, antimony, and bismuth: origin, evolution and future prospects

“…In particular, the unique ability of NHCs to stabilize a broad range of low-valent and low-coordinate species by their strong σ-donating ability makes them very promising ligand motifs in main-group chemistry. 9 Following the success of NHC in main-group compounds, a wide variety of non-NHC derivatives including mesoionic (abnormal) and remote NHCs have also been explored, which show promising results regarding both fundamental bonding studies and various synthetic applications. 10 This has led to the publication of a large number of reviews over the years on the carbene-based chemistry of main group compounds.…”