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Improved reactivity of a cyclic 13/15 compound by increased steric demand.

Herein we present the synthesis and characterization of the new four-membered Ga/P cycle [tBu2 GaP(H)SitBu2 Ph]2 , which shows a cis/trans isomerization at ambient temperatures via a ring opening mechanism. The sterically demanding substituents on the phosphorus (-SitBu2 Ph) and gallium (tBu) atoms lead to an unexpected reactivity towards bulky NHC ligands (IMes and IDipp). The resulting Lewis base stabilized monomeric 13/15 compounds feature an unusual binding mode of the carbene ligand. The ring opened state also enables a masked flp reactivity, which is shown by a reaction with the polar multiple bond in Ph-NCO.

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