Other Auxiliary Agent

Fluorene is a polycyclic aromatic hydrocarbon with white flake crystal. It has fluorescence when impure, and has a characteristic aromatic smell similar to naphthalene. It is found in the high boiling components of automobile exhaust, corn whisker and coal tar. Combustible. It is insoluble in water, but soluble in benzene, carbon disulfide, ethanol and ether. Fluorene can be synthesized in industry and used as precursor of dye, plastics and insecticide. It can be used to synthesize 9-fluorenone, 9-fluorenol and trinitrofluorenone. Polyfluorene can be used as a light emitter in organic light emitting diodes. The 9-position proton of fluorene is acidic with pKa of 22.6 (DMSO), which can be removed by alkali (such as sodium hydroxide) to form orange yellow aromatic anion. The anion can be used as a nucleophilic reagent to replace the electrophilic reagent at 9-position. Fluorene derivative 9-fluorenyl methyl chloroformate (Fmoc CL) is used to give fluorene methoxycarbonyl protection to amino groups in peptide synthesis.

Potassium tert butyl alcohol is an important organic base, which is more basic than potassium hydroxide. Because of the induction effect of (CH3) 3Co trimethyl group, it has stronger basicity and activity than other potassium alcohols, so it is a good catalyst. In addition, as a strong base, potassium TERT butoxide is widely used in chemical industry, medicine, pesticide and other organic synthesis, such as transesterification, condensation, rearrangement, polymerization, ring opening and the production of heavy metal orthoesters. It can be used to catalyze Michael addition, pinacol rearrangement and Ramberg Backlund rearrangement; Potassium TERT butoxide can be used as a condensation agent to catalyze Darzens condensation and STOBBE condensation; It is also the most effective base in the traditional alkoxide haloform reaction for the formation of dihalogenated carbenes. Therefore, potassium tert butyl alcohol is more and more favored by chemical, pharmaceutical, pesticide and other industries. Potassium TERT butoxide is widely used, so there is a great demand for high purity potassium TERT butoxide at home and abroad. However, the production cost of potassium tert butyl alcohol is higher than that of other alkali metal alkoxides, and the production technology needs to be improved.

4-bromobenzyl alcohol, an organic chemical substance. CAS number: 873-75-6. Appearance and properties: light yellow crystalline powder.

PMDA is mainly used as epoxy resin curing agent and polyimide raw material. The crosslinking of polyester resin produces homobenzene polyetherimide resin, which is a high temperature resistant engineering material that can be used continuously and for a long time at 2600C. It is also used to prepare epoxy resin curing agent and plasticizer, urea formaldehyde resin stabilizer, phthalocyanine blue dye, corrosion inhibitor, instantaneous binder, electronic photography toner, etc.

This product can be used to prepare polychloroacetone, as a chain transfer reagent in the synthesis of polychloroacetone, to form a complex with tunethyl aluminum, as a catalyst for olefin stereospecific polymerization, and to prepare nickel complex, as an intermediate in drug synthesis.