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Sorry if I have the incorrect name of the final product. I'm trying to acylate the methyl mercaptan substituent to a thioester (thioacetate). I appreciate any help!

4-(methylsulfanyl)benzaldehyde to S-(4-formylphenyl) ethanethioate

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    $\begingroup$ The preferred prefix for the group $\ce{CH3-CO-S-{}}$ is “acetylsulfanyl”, which would lead to the product name “4-(acetylsulfanyl)benzaldehyde”. The former name “acetylthio”, which would lead to “4-(acetylthio)benzaldehyde”, may still be used in general nomenclature. However, the ester actually has seniority for citation as suffix, which leads to the preferred name “S-(4-formylphenyl) ethanethioate”. $\endgroup$ – Loong Feb 8 '16 at 14:16
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You could react 4-(methylthio)benzaldehyde with $\ce{HBr}$ to form a thiol, and then react the thiol with acetyl chloride in triethylamine to form 4-(thioacetate)benzaldehyde.

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