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77756-15-1

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77756-15-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 77756-15-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,7,5 and 6 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 77756-15:
(7*7)+(6*7)+(5*7)+(4*5)+(3*6)+(2*1)+(1*5)=171
171 % 10 = 1
So 77756-15-1 is a valid CAS Registry Number.

77756-15-1Relevant articles and documents

SYNTHESIS OF 13C-LABELLED ESTROGEN ANALOGUES

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Page 20, (2010/02/08)

There is provided a method of producing novel 13C-labelled estrogen analogues. The method preferably proceeds via an intermediate A or B or which is a mixture of (A) or (B): wherein a13C atom is located at one or more of positions 1, 2, 3 or 4 and wherein R is an optionally substituted alkane, alkene, alkyne or aryl group. Preferably R is -CH2Ph. An alternative preferred intermediate compound is 13C-resorcinol.

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