4-acetyl-5

6

7-trimethoxy-1

4a-dimethyl-4

4a-dihydro-3-H-fluoren-3-one was synthesized by treatment of 3

4

5-trimethoxybenzaldehyde and excessive actylacetone

using H

2

SO

4

or CuCl

2

as a catalyst. The structure was analyzed by 1D NMR (

1

H NMR and

13

C NMR)

2D NMR (H-H COSY

HSQC and HMBC)

LC-MS and elemental analysis and confirmed by crystal structure. The product showed strong fluorescence in ethano (λ

ex

=370 nm

λ

em

=529 nm).