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200562-81-8

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200562-81-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 200562-81-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,0,5,6 and 2 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 200562-81:
(8*2)+(7*0)+(6*0)+(5*5)+(4*6)+(3*2)+(2*8)+(1*1)=88
88 % 10 = 8
So 200562-81-8 is a valid CAS Registry Number.

200562-81-8Downstream Products

200562-81-8Relevant articles and documents

Stereocontrolled Thio-Claisen rearrangement of S-allylic ketene aminothioacetals by an hydroxysubstituted adjacent stereogenic centre

Beslin, Pierre,Lelong, Bruno

, p. 17253 - 17264 (1997)

(Z)-S-alkylic ketene aminothioacetals were prepared from N,N-Dimethyl β-hydroxythioamides 2-8 by deprotonation with LDA (2 eq.) at -78°C followed by S-alkylation with allylic bromide. Rearrangement of these compounds occured easily at room temperature affording major syn N,N-dimethyl β-hydroxy α-allylic thioamides 9-21 with a syn/anti ratio of 80/20 to 98/2. The syn configuration of the major diastereoisomer was confirmed by an univocal synthesis of syn thioamides 9 and 11. The structure assignments were confirmed by empirical 13C NMR rules. The observed induction is well suppported by a proposed transition state model.

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