787-70-2 Usage
Chemical Properties
White to light beige powder
Uses
Dendrimer building block.
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.]
Check Digit Verification of cas no
The CAS Registry Mumber 787-70-2 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,8 and 7 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 787-70:
(5*7)+(4*8)+(3*7)+(2*7)+(1*0)=102
102 % 10 = 2
So 787-70-2 is a valid CAS Registry Number.
787-70-2Relevant articles and documents
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Fraser
, p. 4920 (1961)
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METHOD OF MANUFACTURING BIPHENYLDICARBOXYLIC ACID
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, (2021/05/25)
A method for producing biphenyldicarboxylic acid according to example embodiments of the present invention is to react a biphenyl (biphenyl) with an acyl halide (acyl halide) - based compound to form an agent 1 intermediate. 1 Intermediate and 3 nd amine-based compound are reacted to form a 2 intermediate, and the step 2 intermediate is base-treated. 4,4 ' - Biphenyldicarboxylic acid can be efficiently produced.
Cobalt-catalyzed cross-coupling reactions of aryl- And alkylaluminum derivatives with (hetero)aryl and alkyl bromides
Dilauro, Giuseppe,Messa, Francesco,Bona, Fabio,Perrone, Serena,Salomone, Antonio
supporting information, p. 10564 - 10567 (2021/10/19)
A simple cobalt complex, such as Co(phen)Cl2, turned out to be a highly efficient and cheap precatalyst for a host of cross-coupling reactions involving aromatic and aliphatic organoaluminum reagents with aryl, heteroaryl and alkyl bromides. New C(sp2)-C(sp2) and C(sp2)-C(sp3) bonds were formed in good to excellent yields and with high chemoselectivity, under mild reaction conditions.