BromocresolPurple

• CAS No：

  115-40-2

• Molecular Formula ：

  C21H16Br2O5S

• Molecular Mass ：

  540.22

• Exact Mass ：

  537.908508

• PSA ：

  92.21000

• LogP ：

  5.92

• EINECS ：

  204-087-8

• InChIKeys ：

  ABIUHPWEYMSGSR-UHFFFAOYSA-N

• H-bond Acceptor ：

  5

• H-bond Donor ：

  2

• RBN ：

  2

• Appearance ：

  Purplish-brown Solid

• Density ：

  1.8±0.1 g/cm3

• Melting Point ：

  240 °C (dec.)(lit.)

• Bolling Point ：

  590.2±50.0 °C at 760 mmHg

• Flash Point ：

  36 °C

• Refractive Index ：

  1.695

• Solubility ：

  Practically insoluble in water;ethanol: soluble 1mg/mL

• Storage Condition ：

  Store at RT.

• Vapor Pressure ：

  1.15X10-15 mm Hg at 25 deg C (est)

• BRN ：

  359618

• Stability ：

  Stable. Incompatible with strong oxidizing agents.

• HS Code ：

  29349990

• UN No. ：

  UN19933/PG3

• WGK_Germany ：

  3

• Risk Code ：

  36/37/38-10-20/21/22

• Safety Instructions ：

  26-36-37/39-16

• Dangerous Mark ：

  Xi,Xn

• P Code ：

  P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501

• Hazard Statements ：

  H315

As indicator, pH 5.2 yellow; pH 6.8 purple.

Dissolve o-toluidine in dilute sulfuric acid, cool, add sodium nitrite solution with stirring, and control the reaction temperature below 5°C. After the reaction is completed, heat to 40-50°C until no bubbles occur, cool and filter, and refine the o-cresol by fractional distillation. Mix o-cresol with o-toluenesulfonic anhydride and zinc chloroform, stir and heat, react at 115-120℃ for 7h, remove the remaining o-cresol by steam, and filter to obtain o-cresol red: o-cresol red is dissolved after purification Glacial acetic acid, add the mixed solution of bromine and glacial acetic acid under stirring. After the addition is complete, heat at 40-50℃ for 4h, cool and filter to obtain bromocresol purple.