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1257268-23-7

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1257268-23-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1257268-23-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,5,7,2,6 and 8 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1257268-23:
(9*1)+(8*2)+(7*5)+(6*7)+(5*2)+(4*6)+(3*8)+(2*2)+(1*3)=167
167 % 10 = 7
So 1257268-23-7 is a valid CAS Registry Number.

1257268-23-7Downstream Products

1257268-23-7Relevant articles and documents

New facile enantio- and diastereo-selective syntheses of (-)-triptonide and (-)-triptolide

Zhang, Hongrui,Li, Haifeng,Xue, Jijun,Chen, Rui,Li, Ying,Tang, Yu,Li, Chunxin

, p. 732 - 736 (2014)

A novel formal asymmetric synthesis of (-)-triptonide and (-)-triptolide, featuring a new alternative access to their known key intermediate 4, has been achieved through two synthetic routes in 9 steps with 13.6% total yield and 10 steps with 18.5% overall yield, respectively. This synthesis is scalable and hence has high potential for application to further synthetic elaboration and biologic investigation on such natural products.

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