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131768-59-7

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131768-59-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131768-59-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,7,6 and 8 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 131768-59:
(8*1)+(7*3)+(6*1)+(5*7)+(4*6)+(3*8)+(2*5)+(1*9)=137
137 % 10 = 7
So 131768-59-7 is a valid CAS Registry Number.

131768-59-7Downstream Products

131768-59-7Relevant academic research and scientific papers

Studies of the synthesis of biomarkers. VII. Synthesis of 5α-(17R,20R)-14,15-secocholestane

Li, Tong-Shuang,Li, Yu-Lin,Liang, Xiao-Tian

, p. 263 - 265 (2007/10/02)

5α-(17R,20R)-14,15-Secocholestane (12) was synthesized from cholesterol (1) in 12 steps.The key intermediate, 5α-cholest-14-en-3β-yl acetate (4), underwent ozonization, reduction, hydrolysis, and oxidation to provide 5α-14,15-secocholesta-3,14,15-trione (8).One of the Clemmensen reduction products of 8 is 5α(17R,20R)-14,15-secocholest-15-ol (II), treatment of the alcohol (II) with tosyl chloride and subsequent reduction with lithium aluminum hydride yielded the target molecule (12).

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