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The reference for the first synthesis is from a french pdf. Camille PINET (1855-1910), further articles:

• doi:10.1039/JS8752801305
• doi:10.1007/BF01169065
• doi:10.1016/j.tet.2004.04.043
• doi:10.1039/PL8971300235
• doi:10.1007/BF01517109
• doi:10.1016/j.tet.2004.04.043