“…Selected IR data (KBr disc, cm −1 ): 3287,3063,2976,2867,2560,1713,1643,1536,1434,1408,1340,1325,1295,1269,1243,1072,1026,1002,919,895,819,738,673,644. (2). The same procedure was followed for the preparation of all compounds, so only the synthesis of 2 is described in detail.…”