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21690-63-1

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21690-63-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21690-63-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,9 and 0 respectively; the second part has 2 digits, 6 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21690-63:
(7*2)+(6*1)+(5*6)+(4*9)+(3*0)+(2*6)+(1*3)=101
101 % 10 = 1
So 21690-63-1 is a valid CAS Registry Number.

21690-63-1Relevant articles and documents

Regioselective desymmetrization of diaryltetrahydrofurans via directed ortho-lithiation: An unexpected help from green chemistry

Mallardo, Valentina,Rizzi, Ruggiero,Sassone, Francesca C.,Mansueto, Rosmara,Perna, Filippo M.,Salomone, Antonio,Capriati, Vito

supporting information, p. 8655 - 8658 (2014/07/22)

An efficient functionalization of diaryltetrahydrofurans via a regioselective THF-directed ortho-lithiation is first described. This reaction can be successfully carried out in cyclopentyl methyl ether as a greener alternative to Et2O, with better results in terms of yield and selectivity and, surprisingly, also in protic eutectic mixtures competitively with protonolysis.

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