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137812-16-9

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137812-16-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137812-16-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,8,1 and 2 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 137812-16:
(8*1)+(7*3)+(6*7)+(5*8)+(4*1)+(3*2)+(2*1)+(1*6)=129
129 % 10 = 9
So 137812-16-9 is a valid CAS Registry Number.

137812-16-9Downstream Products

137812-16-9Relevant articles and documents

Diels-Alder reactions of activated 2H-thiopyrans

Ward, Dale E.,Gai, Yuanzhu,Zoghaib, Wajdi M.

, p. 1487 - 1497 (2007/10/02)

The Diels-Alder reactivity of various 2H-thiopyrans bearing electron-donating substituents has been investigated.The approximate order of the reactivity among the 2H-thiopyrans studied was 4,6-disubstituted >> 5-substituted > 4-substituted, 3,5-disubstituted >> 3-substituted.Good yields of predominantly endo adducts are obtained with reactive dienophiles.With less reactive dienophiles, reactions are much slower and yields are attenuated due to the competing thermal decomposition of the dienes under the reaction conditions.The adducts obtained are equivalent (via desulfurization) to those from unreactive cis-substituted dienes. Key words: Diels-Alder, 2H-thiopyran.

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