Indenes, playing an important role as structural units or starting material for the construction of some important or- ganic compounds, have been well recognized.1 For example, sulindac is an anti-inflammatory drug which has an indene moiety in the structure.2 Recently indenes have been the sub- ject of extensive studies due to their biological activities, which include antibacterial activity,3a antiviral activity,3b antifungal activity,3c apoptosis activity,3d and cytotoxicity to ...