Phenyl 2-(Trimethylsilylethynyl)phenyl Ketone and 2-(Trimethylsilylethynyl)benzaldehyde

The two aromatic ring planes in phenyl 2-(trimethylsilylethynyl)phenyl ketone, C₁₈H₁₈OSi, form a dihedral angle of 67.16 (6)°. The Si atom lies 0.1330 (6) Å out of the plane formed by the disubstituted aromatic ring. The carbonyl unit is not coplanar with either aromatic ring, forming O-C-C-C torsion angles with magnitudes of 41.4 (3) and 33.3 (3)°. The triple bond length is 1.199 (3) Å and the C=O and C-Si bond distances are 1.218 (2) and 1.837 (2) Å, respectively. In 2-(trimethylsilylethynyl)benzaldehyde, C₁₂H₁₄OSi, the molecule lies on a crystallographic mirror plane. The triple bond has a length of 1.192 (3) Å and the C=O and C-Si bond distances are 1.196 (3) and 1.839 (3) Å, respectively.

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