Silyl ancillary ligands are expected to generate the reactive unsaturated metal center due to their exceptionally strong trans-influence and -effect. Nevertheless, little has been known on the influence of silyl ligands on the reactivity of transition-metal complexes. This would be mainly due to the facile cleavage of the metal-silicon bond. (Phosphinoalkyl)silyl ligands have been developed to suppress the elimination of silyl groups from the metal center. This article reviews the synthesis and properties of the transition metal complexes having chelate-type (phosphinoalkyl)silyl ligands R2P(CH2)nSiR2 (n = 1, 2).
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