Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 15, Pages 4847-4851Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201812058
Keywords
carbenes; heterocycles; ligands; silylenes; structure elucidation
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Funding
- A*STAR
- EPSRC [EP/K014714/1]
- Jardine-Oxford Scholarship
- EPSRC [EP/K014714/1] Funding Source: UKRI
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Introduced here is a new type of strongly donating N-heterocyclic boryloxy (NHBO) ligand, [(HCDippN)(2)BO](-) (Dipp = 2,6-diisopropylphenyl), which is isoelectronic with the well-known N-heterocyclic iminato (NHI) donor class. This 1,3,2-diazaborole functionalized oxy ligand has been used to stabilize the first acyclic two-coordinate dioxysilylene and its Ge, Sn, and Pb congeners, thereby presenting the first complete series of heavier group 14 dioxycarbene analogues. All four compounds have been characterized by X-ray crystallography and density-functional theory, enabling analysis of periodic trends: the potential for the [(HCDippN)(2)BO](-) ligand to subtly vary its electronic-donor capabilities is revealed by snapshots showing the gradual evolution of arene coordination on going from Si to Pb.
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