Scheme 5. Gram scale preparation and use of catalytic 3,5dimethylphenyl iodine. Scheme 6. Synthesis of indolo[3,2-a]carbazole alkaloid.COMMUNICATIONS

The α decay rate of 210 Po was measured in a film sample (210 Po @Bi 2 O 3) and a slice sample (210 Po @Bi metal), respectively. The former was used as a reference sample. The half-lives of 210 Po @Bi 2 O 3 and 210 Po @Bi metal environments were observed to be (138.40 ± 0.21 d) and (138.87 ± 0.87 d) at room temperature, respectively. It was found that the half-life of 210 Po is consistent with international recommendations within the uncertainty limits, and we did not find any deviation of the α decay rate of 210 Po between film sample (210 Po @Bi 2 O 3) and slice sample (210 Po @Bi metal).