Isolation of the Metalated Ylides [Ph₃ P-C-CN]M (M=Li, Na, K): Influence of the Metal Ion on the Structure and Bonding Situation.

ABSTRACT: The isolation and structural characterization of the cyanido-substituted metalated ylides [Ph₃ P-C-CN]M (1-M; M=Li, Na, K) are reported with lithium, sodium, and potassium as metal cations. In the solid-state, most different aggregates could be determined depending on the metal and additional Lewis bases. The crown-ether complexes of sodium (1-Na) and potassium (1-K) exhibited different structures, with sodium preferring coordination to the nitrogen end, whereas potassium binds in an unusual η² -coordination mode to the two central carbon atoms. The formation of the yldiide was accompanied by structural changes leading to shorter C-C and longer C-N bonds. This could be attributed to the delocalization of the free electron pairs at the carbon atom into the antibonding

SUBMITTER: Schwarz C 

PROVIDER: S-EPMC6519153 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature