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128702-25-0

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128702-25-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128702-25-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,7,0 and 2 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 128702-25:
(8*1)+(7*2)+(6*8)+(5*7)+(4*0)+(3*2)+(2*2)+(1*5)=120
120 % 10 = 0
So 128702-25-0 is a valid CAS Registry Number.

128702-25-0Downstream Products

128702-25-0Relevant articles and documents

The oxidative cross-coupling of substituted 2-naphthols. Part I: The scope and limitations

Hovorka,Scigel,Gunterova,Tichy,Zavada

, p. 9503 - 9516 (1992)

Highly selective oxidative cross-coupling of differently substituted 2-naphthols mediated by Cu(II)-tert-butyl amine complexes is described. The 'cross'-products are obtained in good to excellent yields and the selectivity up to >90% is observed depending on the substitution of naphthol nuclei. The alternative procedures - the cross-coupling of free naphthols with CuCl(OMe) as well as the coupling of sodium naphtholates with anhydrous copper(II) chloride - were also studied. All these methods enable a simple and high-yield access to the unsymmetrically substituted binaphthols. A successful optical resolution of methyl 2,2'-dihydroxy-1,1'-binaphthalene-3-carboxylate by means of liquid chromatography on triacetylcellulose and the subsequent configurational correlation with a binaphthol derivative of known absolute configuration is reported.

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