Unexpectedly Large Structural Variations in Benzyl‐Substituted Sila[1]ferrocenophanes

Author:

Nezamzadeh Ahmadreza1ORCID,Bhattacharya Satavisha1,Zhu Jianfeng2,Müller Jens1ORCID

Affiliation:

1. Department of Chemistry University of Saskatchewan 110 Science Place Saskatoon Saskatchewan S7N 5C9 Canada

2. Saskatchewan Structural Sciences Centre University of Saskatchewan 110 Science Place Saskatoon Saskatchewan S7N 5C9 Canada

Abstract

AbstractA set of four planar‐chiral sila[1]ferrocenophanes equipped with a benzyl group in the α‐position, either on one or both Cp rings, and substituted on the bridging silicon atom, either by methyl or phenyl groups, were prepared. While NMR, UV/Vis, and DSC measurements did not show anything uncommon, single crystal X‐ray analyses revealed unexpectedly large variations of the dihedral angles between both Cp rings (α tilt angle). While DFT calculations predicted α between 19.6 and 20.8°, measured values were found between 16.6(2) and 21.45(14)°. However, experimentally determined conformers differ significantly from those calculated for the gas phase. For the sila[1]ferrocenophane with the largest mismatch between the experimental and predicted α angle, it was shown that the orientation of benzyl groups have a significant influence on the ring‐tilted structure. Packing of molecules in the crystal lattice forces benzyl groups into unusual orientations, resulting in a significantly reduced α angle through steric repulsions.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

Wiley

Subject

General Chemistry,Catalysis,Organic Chemistry

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