A novel palladium-catalyzed C-H double carbonylation introduces two adjacent carbonyl groups for the synthesis of isatins from readily available anilines. The reaction proceeds under atmospheric pressure of CO with high regioselectivity and without any additives. Density functional theory investigations indicate that the palladium-catalyzed double carbonylation catalytic cycle is plausible.

A novel palladium‐catalyzed CH double carbonylation introduces two adjacent carbonyl groups for the synthesis of isatins from readily available anilines. The reaction proceeds under atmospheric pressure of CO with high regioselectivity and without any additives. Density functional theory investigations indicate that the palladium‐catalyzed double carbonylation catalytic cycle is plausible.

China's current individual income tax has a wide range of taxes, and there are many different kinds of tax obligations.China is also a large population, and individual income tax is paid mainly through withholding. In a volatile market, the boundary between withholding and paying taxes is easily blurred, resulting in a series of tax risks. In this paper, the author analyzes the tax payment and withholding tax in the tax sense; and explaining the confusion caused by the withholding and tax payment, and then explores the countermeasures from the perspective of tax authorities and enterprises.

A novel palladium‐catalyzed C—H double carbonylation introduces two adjacent carbonyl groups for the synthesis of isatins from readily available anilines.