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117833-93-9

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117833-93-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 117833-93-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,8,3 and 3 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 117833-93:
(8*1)+(7*1)+(6*7)+(5*8)+(4*3)+(3*3)+(2*9)+(1*3)=139
139 % 10 = 9
So 117833-93-9 is a valid CAS Registry Number.

117833-93-9Relevant articles and documents

Synthesis of Chiral Vinylglycines

Beaulieu, Pierre L.,Duceppe, Jean-Simon,Johnson, Carolyne

, p. 4196 - 4204 (2007/10/02)

(R)- or (S)-benzyl 4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate (7a) and (R)- or (S)-1,1-dimethylethyl 4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate (7b), readily available from serine, react with Wittig reagents to give alkenes 8.Selective deprotection followed by oxidation of the resulting unsaturated amino alcohols 9 provides vinylglycines 5 of defined configuration (>95percent ee) and double-bond geometry.D-Vinylglycines are obtained from L-serine, and conversely, D-serine gives β,γ-unsaturated amino acids with the L configuration.The double-bond geometry is controlled by the nature of the phosphorous ylide employed.The scope and limitations of this new methodology for the preparation of chiral vinylglycines is examined.

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