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Lawesson 's reagent , or LR , is a chemical compound used in organic synthesis as a thiation agent .. chemical compound. chemical compound. organic synthesis. organic synthesis. thiation. thiation. Lawesson 's reagent was first made popular by Sven-Olov Lawesson , who did not , however , invent it .. Sven-Olov Lawesson. Sven-Olov Lawesson. Lawesson 's reagent was first made in 1956 during a systematic study of the reactions of arenes with P4S10 .