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33813-99-9

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33813-99-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33813-99-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,8,1 and 3 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 33813-99:
(7*3)+(6*3)+(5*8)+(4*1)+(3*3)+(2*9)+(1*9)=119
119 % 10 = 9
So 33813-99-9 is a valid CAS Registry Number.

33813-99-9Downstream Products

33813-99-9Relevant articles and documents

Studies on a Convergent Route to Side-Chain Analogues of Vitamin D: 25-Hydroxy-23-oxavitamin D3

Toh, H. T.,Okamura, William H.

, p. 1414 - 1417 (2007/10/02)

Permanganate oxidation of vitamin D3 affords the 7,8-diol 4a, which was successively silylated to 4b and then oxidatively cleaved and reduced to afford 3c.The latter was converted in several steps to phosphine oxide 3b, a useful A-ring fragment for analog

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