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6543-12-0

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6543-12-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 6543-12-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,5,4 and 3 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 6543-12:
(6*6)+(5*5)+(4*4)+(3*3)+(2*1)+(1*2)=90
90 % 10 = 0
So 6543-12-0 is a valid CAS Registry Number.

6543-12-0Relevant articles and documents

Original synthesis of linear, branched and cyclic oligoglycerol standards

Cassel, Stephanie,Debaig, Catherine,Benvegnu, Thierry,Chaimbault, Patrick,Lafosse, Michel,Plusquellec, Daniel,Rollin, Patrick

, p. 875 - 896 (2007/10/03)

A variety of authentic standards of linear, branched and cyclic oligomers of glycerol, with well-defined structures and degrees of polymerisation from 2 to 5, have been efficiently synthesised. Linear oligomers were obtained by means of a convergent approach based on regioselective opening of bis(epoxides) with solketal; branched compounds were synthesised using oxidative cleavage of the corresponding anhydrohexitols as the key step. A 6-exo-trig halocyclisation reaction involving heteroatom-tethered unsaturated alcohols permitted an efficient synthesis of the precursors of selected cyclic dimers; larger cyclic oligomers were prepared by two one-pot Williamson reactions using a ditriflate derived from diglycerol. All these methodologies permitted further scaling up.

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