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128856-03-1

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128856-03-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128856-03-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,8,5 and 6 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 128856-03:
(8*1)+(7*2)+(6*8)+(5*8)+(4*5)+(3*6)+(2*0)+(1*3)=151
151 % 10 = 1
So 128856-03-1 is a valid CAS Registry Number.

128856-03-1Downstream Products

128856-03-1Relevant articles and documents

Zirconocene-catalyzed cationic Diels-Alder reactions

Wipf, Peter,Xu, Wenjing

, p. 4551 - 4562 (2007/10/02)

In situ prepared Cp2ZrCl+ catalyzes the formation of dioxolenium ions from α,β-unsaturated epoxy esters. As a consequence of this activation process, acrylate, methacrylate and crotonate derivatives undergo a rapid and stereoselective cationic [4+2] cycloaddition with a wide range of dienes. Ring-extended carboxylic acid derivatives are formed in 1-7 h at 0-21°C and in 50-90% yield after saponification of the intermediate diol esters. Simple Lewis acid catalysis by Cp2ZrCl+ can be excluded on the basis of the experimental results.

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