The Production Process of 9,9'-Diphenyl-9H,9'H-3,3'-bicarbazole

The production process of 9,9'-diphenyl-9H,9'H-3,3'-bicarbazole, also known as PCBP-209, involves several steps that require careful preparation and execution to ensure the quality and purity of the final product.

1. Synthesis of the starting material: The synthesis of the starting material, diphenyl-carbazole, involves the reaction of phenol with carbon disulfide in the presence of a Lewis acid catalyst such as aluminum chloride.
   The product is then treated with hydrazine to convert it into the desired carbazole.
   
2. Condensation: The carbazole is then condensed with another carbazole molecule, using a condensation reaction, to form a dimer.
   The dimer is then treated with a reducing agent such as lithium aluminum hydride to convert it into the desired bicarbazole.
   
3. Substitution: The bicarbazole is then subjected to substitution reactions, where the phenyl groups are replaced with other substituents.
   In the case of PCBP-209, the substitution reactions are carried out with a reactive sulfur compound, such as methyl iodide or chlorosulfonic acid, to introduce the methyl and chlorine groups onto the bicarbazole molecule.
   
4. Purification: After the substitution reactions are complete, the product is purified through several chromatography techniques, such as flash chromatography or high-performance liquid chromatography (HPLC).
   The purified product is then collected and dried.
   
5. Characterization: The final product is then characterized through several methods, such as nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry, to confirm its identity and purity.
   

In conclusion, the production process of 9,9'-diphenyl-9H,9'H-3,3'-bicarbazole involves several steps, including the synthesis of the starting material, condensation, substitution, purification, and characterization.
The quality and purity of the final product are critical to its performance and application in chemical reactions and other industrial processes.