(Solved): Mesitylene (1,3,5-trimethyl benzene) is reacted with \( \mathrm{W}(\mathrm{CO ...

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Mesitylene (1,3,5-trimethyl benzene) is reacted with \( \mathrm{W}(\mathrm{CO})_{6} \) to yield compound \( \mathbf{A} \). A obeys the 18 electron rule and exhibits two singlets in the \( { }^{1} \mathrm{H} \) NMR centred on \( 2.25 \mathrm{ppm}(9 \mathrm{H}) \) and at \( 5.23(3 \mathrm{H}) \). An IR spectrum of \( \mathbf{A} \) indicates that there are carbonyl stretches at \( 1825 \mathrm{~cm}^{-1} \) and \( 1942 \mathrm{~cm}^{-1} \) with relative peak areas of 9 and \( 6.4 \) respectively. The \( { }^{1} \mathrm{H} \) NMR spectrum of pure mesitylene exhibits two singlets at \( 2.25 \mathrm{ppm}(9 \mathrm{H}) \) and \( 6.78(3 \mathrm{H}) \). Identify \( \mathbf{A} \) and explain your interpretation of the spectroscopic information provided. Calculate the \( \mathrm{CO}-\mathrm{M}-\mathrm{CO} \) bond angle using the information provided.