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23880-55-9

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23880-55-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 23880-55-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,8,8 and 0 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 23880-55:
(7*2)+(6*3)+(5*8)+(4*8)+(3*0)+(2*5)+(1*5)=119
119 % 10 = 9
So 23880-55-9 is a valid CAS Registry Number.

23880-55-9Downstream Products

23880-55-9Relevant articles and documents

THE PREPARATION OF ESTRADIOL-17β SULFATES WITH TRIETHYLAMINE-SULFUR TRIOXIDE

Dusza, John P.,Joseph, Joseph P.,Bernstein, Seymour

, p. 303 - 316 (1985)

Reaction of estradiol-17β with triethylamine-sulfur trioxide in pyridine gives exclusively monosulfation at the C17-hydroxyl group with the preparation of 17β-sulfooxyestra-1,3,5(10)-trien-3-ol triethylammonium salt (V).The structural assignment suggested by spectroscopic measurements was confirmed by synthetic studies. II V A synthesis of 3-sulfooxyestra-1,3,5(10)-trien-17β-ol triethylammonium salt (II) has been accomplished base on the preparation of 17β-formyloxyestra-1,3,5(10)-trien-3-ol (XIII).Fusion of the 3-sulfate triethylammonium salt II gives rise to the 17-sulfate triethylamine salt V.The preparation of estradiol-17β disulfate has also been achieved.

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