2,2'-Diiodo-9,9'-spirobifluorene

Details:

Melting point     >300 °C(lit.)
Boiling point     482.5±38.0 °C(Predicted)
density     1.347±0.06 g/cm3(Predicted)
storage temp.     Sealed in dry,Room Temperature
pka    3.77±0.10(Predicted)
form     Powder
color     White to light beige
BRN     523308
InChIKey    NEQFBGHQPUXOFH-UHFFFAOYSA-N
CAS DataBase Reference    787-70-2(CAS DataBase Reference)
EPA Substance Registry System    [1,1'-Biphenyl]-4,4'-dicarboxylic acid (787-70-2)
Safety Information
Hazard Codes     Xi,Xn
Risk Statements     36/37/38-20/21/22
Safety Statements     26-37/39-36
WGK Germany     3
RTECS     DV2975000
HS Code     29173990
MSDS Information
Provider    Language
SigmaAldrich    English
Biphenyl-4,4'-dicarboxylic acid Usage And Synthesis
Chemical Properties    White to light beige powder
Purification Methods    The dicarboxylic acid is a white amorphous or microcrystalline substance which does not melt or sublime. It is best purified by precipitation of an aqueous alkaline solution with mineral acid, washing well with H2O and drying in vacuo at 100o. It is characterized by conversion to diphenyl-4,4’-dicarbonyl chloride (with PCl5 [Work J Chem Soc 1317 1940], or by phase transfer catalysis with SOCl2 + BuEt3N+Cl-in 1,2-dichloroethane [Burdett Synthesis 441 1991]) which crystallises from *C6H6 with m 184o. The di-acid chloride gives the dimethyl ester with MeOH, and has m 215-217o (plates from MeOH, m’s of 214o and 224o were also reported). The diethyl ester is similarly prepared with EtOH and has m 122o (from EtOH). [Beilstein 9 II 665, 9 III 4519, 9 IV 3563.]
Biphenyl-4,4'-dicarboxylic acid Preparation Products And Raw materials
Preparation Products    4,4'-BIPHENYLDICARBONYL CHLORIDE-->4,4'-Bis(hydroxymethyl)biphenyl