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158469-52-4

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158469-52-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 158469-52-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,4,6 and 9 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 158469-52:
(8*1)+(7*5)+(6*8)+(5*4)+(4*6)+(3*9)+(2*5)+(1*2)=174
174 % 10 = 4
So 158469-52-4 is a valid CAS Registry Number.

158469-52-4Relevant articles and documents

Synthesis of (±)-combretastatin D-1 and combretastatin D-2

Rychnovsky,Hwang

, p. 5414 - 5418 (2007/10/02)

(±)-Combretastatin D-1 was synthesized in 16 steps by way of its congener, combretastatin D-2. In the key step, the strained 15-membered lactone ring was formed using high-dilution Mitsunobu conditions in 89% yield. Saturated seco acid 4 was a much better substrate for the cyclization reaction than the unsaturated seco acid 3.

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