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208999-51-3

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208999-51-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 208999-51-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,8,9,9 and 9 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 208999-51:
(8*2)+(7*0)+(6*8)+(5*9)+(4*9)+(3*9)+(2*5)+(1*1)=183
183 % 10 = 3
So 208999-51-3 is a valid CAS Registry Number.

208999-51-3Downstream Products

208999-51-3Relevant articles and documents

Intramolecular 4+3 cycloadditions. Allylic sulfones as precursors to vinylthionium ions

Harmata, Michael,Kahraman, Mehmet

, p. 3421 - 3424 (1998)

Treatment of a THF solution of (E)-3 with n-BuLl followed by quenching with an electrophile generally results in regioselective alkylation alpha to the sulfone with the alkene possessing (E) stereochemistry in the major product. High selectivity for the (E) alkylation product can be achieved in the presence of small amounts of HMPA. When those (E) alkylation products possessing a diene moiety in the side chain are treated with Lewis acids, 4+3 cycloaddition products are formed in good to excellent yields.

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