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97156-48-4

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97156-48-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 97156-48-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,1,5 and 6 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 97156-48:
(7*9)+(6*7)+(5*1)+(4*5)+(3*6)+(2*4)+(1*8)=164
164 % 10 = 4
So 97156-48-4 is a valid CAS Registry Number.

97156-48-4Downstream Products

97156-48-4Relevant articles and documents

Synthesis of Alkyl- and Alkoxy-Substituted Benzils and Oxidative Coupling to Tetraalkoxyphenanthrene-9,10-diones

Mohr, Bernhard,Enkelmann, Volker,Wegner, Gerhard

, p. 635 - 638 (1994)

Intermolecular Friedel-Crafts acylation of various substituted alkyl- or alkoxybenzenes with oxalyl chloride using carbon disulfide as solvent gave rise to the benzils 1a-k.Subsequent intramolecular oxidative coupling with either thallium(III) oxide/trifluoroacetic acid or vanadium(V) oxyfluoride/boron trifluoride diethyl etherate resulted in the corresponding phenanthrene-9,10-diones 2a-d.It has been shown that oxygen functionalities at the 3,3',4, and 4'positions are necessary for coupling to occur.These substituted benzils and phenanthrene-9,10-diones constitute precursors for ligands in the field of discotic metallomesogens or polymeric mesogens.

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