Pyrrole‐based pincer ligands containing iminophosphorane moieties and their coordination chemistry with group 1 metals and magnesium

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چکیده

Abstract The Staudinger reaction of 2,5‐bis((di‐ tert ‐butylphosphaneyl)methyl)‐1 H ‐pyrrole ( t Bu PNP)H; PNP=C 4 2 N‐2,5‐CH P ) with equiv. Me 3 SiN cleanly furnishes 1,1′‐((1 ‐pyrrole‐2,5‐diyl)bis(methylene))bis(1,1‐di‐ ‐butyl‐ N ‐(trimethylsilyl)‐λ 5 ‐phosphanimine) 1 ; (NPNPN)H, NPNPN=C NSiMe in excellent yield. Pyrrole is easily deprotonated by alkali metal amides, [MN(SiMe ] (M=Li, Na, K, Cs) to yield the corresponding pyrrolides, 1‐M . Compound 1‐Li features a κ‐ , coordination whereby both iminophosphorane side‐arms are coordinated lithium cation (with additional short Li⋅⋅⋅H contacts, whereas heavier congeners form dimeric structures. This results κ‐N,N within one [(NPNPN)M] (M=Na, unit, and structure then completed η ‐coordination pyrrolyl ligand neighbouring metal. Furthermore, heteroleptic magnesium alkyl complexes, 1‐MgR isolated from [MgR (R= CH SiMe CMe Ph) (PNP*)H (1 equiv).

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ژورنال

عنوان ژورنال: Zeitschrift für anorganische und allgemeine Chemie

سال: 2021

ISSN: ['0044-2313', '1521-3749']

DOI: https://doi.org/10.1002/zaac.202100080