Chasing Multiple Bonding Interactions between Alkaline‐Earth Metals and Main‐Group Fragments

Formally dianionic ligands such as alkylidenes or organoimidos play a major role in the organometallic chemistry of transition metals and are an emerging topical area of f‐element chemistry. The pursuit and development of main‐group‐metal congeners has been tackled sporadically but is clearly lackin...

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Bibliographic Details
Published in:Chemistry : a European journal 2019-06, Vol.25 (35), p.8190-8202
Main Authors: Wolf, Benjamin M., Anwander, Reiner
Format: Article
Language:English
Subjects:
Alkali metals
alkaline-earth metal
alkylidene
Chemistry
Congeners
imide
Ligands
Metals
Organic chemistry
Organometallic compounds
phosphandiide
silylene
Transition metals
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Summary:Formally dianionic ligands such as alkylidenes or organoimidos play a major role in the organometallic chemistry of transition metals and are an emerging topical area of f‐element chemistry. The pursuit and development of main‐group‐metal congeners has been tackled sporadically but is clearly lacking behind. The pronounced ionic bonding in particular, prevailing in alkali and alkaline‐earth (Ae) metal derivatives, proved cumbersome. Recent substantial progress in the respective field of divalent Ae chemistry has been triggered by the implementation of new synthesis strategies involving new AeII precursors and tailor‐made ligands. The main emphasis of this Minireview will be on the synthesis and reactivity of well‐defined Group 2 alkylidenes, organoimides, silylenes, and phosphandiides. Discrete alkaline‐earth (Ae) metal complexes with alkylidene, organoimido, silylene, and phosphandiido ligands are accessible via elaborate synthesis strategies but charge delocalization via (hetero)metal bridging or heteroatom implementation into backbone substituents R seems crucial in order to cope with the prevailing ionic bonding.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201901169