Crystals of Zr(P-CH2C6H4CMe3)(4), tetra(4-tert-butylbenzyl)zirconium (1), have been studied by X-ray diffraction. The crystals belong to the tetragonal system, space group I (4) over bar, with a = 16.481 (2), c = 7.131(4) Angstrom, so that chemically equivalent ligands are also structurally equivalent, unlike other known homoleptic M(CH2C6H5)(4) compounds. Zr-CH2-C-ipso bond angles of 90.0(2)degrees suggest that ligands are eta(2)-bonded. The structure is discussed along with that of Zr(CH2C6H5)4, tetrabenzylzirconium (2) (redetermined), which is crystallographically unsymmetrical but also of approximate S-4 symmetry. The distortion of (2) from tetragonal symmetry (the four Zr-CH2-C-ipso bond angles being rather different) is discussed along with crystal packing.
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