Assembly of ethylzincate compounds into supramolecular structures

Alkali metal oxides trapped by diethylzinc

“…A similar distortion is observed in the structure of a-K 2 (ZnEt 2 ) 4 (m 6 -O). 13 The Zn-O and Zn-C bond lengths in 5 are similar to those observed in structure 2. The K-O bond in 5 (2.816(1) Å) is naturally longer than the Na-O bond in 2 (2.278(1) Å).…”

“…1 H NMR (600 MHz, THF-d 8 ): d = 1.12 (t, CH 3 ), À0.247 (q, CH 2 ). 13 C NMR (151 MHz, THF-d 8 ): d = 9.64 (CH 3 ), 0.00 (CH 2 ).…”

“…Hedstro ¨m et al reported that combination of metallic potassium and ZnEt 2 resulted in a low-yield byproduct, a-K 2 (ZnEt 2 ) 4 (m 6 -O). 13 They speculated that oxygen in the final product originated from adventitious water. Our earlier discussion, however, suggests that the partial hydrolysis of ZnEt 2 cannot lead to such clusters.…”

Synthesis, Structure and Solution Studies on Mixed Aryl/Alkyl Lithium Zincates

“…Few solvent‐free mixed aryl/alkyl heteroleptic zincate structures are known. Lennartson and Hedström prepared polymeric [NaZnEt 2 Ph] ⋡ , and George and Purdy prepared the polymeric potassium zincate, [KZn(CH 2 SiMe 3 ) 2 Ph] ⋡ , by metallation of benzene (vide supra) , . Another alkali‐metal zincate, potassium tricyclopentadienylzincate, exists as a two‐dimensional network .…”

“…Lennartson and Hedström prepared polymeric [NaZnEt 2 Ph] ∞ , and George and Purdy prepared the polymeric potassium zincate, [KZn(CH 2 SiMe 3 ) 2 Ph] ∞ , by metallation of benzene (vide supra). [13,21] Another alkali-metal zincate, potassium tricyclopentadienylzincate, exists as a two-dimensional network. [22] Structures of solvent-free homoleptic alkylzincates are also few in number but include lithium tetramethylzincate, [23] which exists as a three-dimensional network, and MZn(CH 2 SiMe 3 ) 3 (M = Li, Na, K), which all exhibit supramolecular assemblies; a linear polymeric chain in the case of Li, and three-dimensional and two-dimensional coordination networks for Na and K, respectively.…”