An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Abstract Interaction of p ‐ tert ‐butylcalix[8]areneH 8 (L 8 H 8 ) with [NaVO(O t Bu) 4 ] (formed in situ from VOCl 3 ) afforded the complex [Na(NCMe) 5 ][(VO) 2 L 8 H]⋅4 MeCN ( 1 ⋅4 MeCN). Increasing [NaVO(O t Bu) 4 ] to 4 equiv led to [Na(NCMe) 6 ] 2 [(Na(VO) 4 L 8 )(Na(NCMe)) 3 ] 2 ⋅10 MeCN ( 2 ⋅10 MeCN). With adventitious oxygen, reaction of 4 equiv of [VO(O t Bu) 3 ] with L 8 H 8 afforded the alkali‐metal‐free complex [(VO) 4 L 8 (μ 3 ‐O) 2 ] ( 3 ); solvates 3 ⋅3 MeCN and 3 ⋅3 CH 2 Cl 2 were isolated. For the lithium analogue, the order of addition had to be reversed such that lithium tert ‐butoxide was added to L 8 H 8 and then treated with 2 equiv of VOCl 3 ; crystallisation afforded [(VO 2 ) 2 Li 6 [L 8 ](thf) 2 (O t Bu) 2 (Et 2 O) 2 ]⋅Et 2 O ( 4 ⋅Et 2 O). Upon extraction into acetonitrile, [Li(NCMe) 4 ][(VO) 2 L 8 H]⋅8 MeCN ( 5 ⋅8 MeCN) was formed. Use of the imido precursors [V(N t Bu)(O t Bu) 3 ] and [V(N p ‐tolyl)(O t Bu) 3 ] and L 8 H 8 , afforded [ t BuNH 3 ][{V( p ‐tolylN)} 2 L 8 H]⋅3 1/2 MeCN ( 6 ⋅3 1/2 MeCN). The molecular structures of 1 to 6 are reported. Complexes 1 , 3 , and 4 were screened as precatalysts for the polymerisation of ethylene in the presence of cocatalysts at various temperatures and for the copolymerisation of ethylene with propylene. Activities as high as 136 000 g (mmol(V) h) −1 were sometimes achieved; higher molecular weight polymers could be obtained versus the benchmark [VO(OEt)Cl 2 ]. For copolymerisation, incorporation of propylene was 7.1–10.9 mol % (compare 10 mol % for [VO(OEt)Cl 2 ]), although catalytic activities were lower than [VO(OEt)Cl 2 ].
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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