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83338-72-1

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83338-72-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 83338-72-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,3,3 and 8 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 83338-72:
(7*8)+(6*3)+(5*3)+(4*3)+(3*8)+(2*7)+(1*2)=141
141 % 10 = 1
So 83338-72-1 is a valid CAS Registry Number.

83338-72-1Relevant articles and documents

A Facile Synthesis of Ketene O,N-Acetals and Ketene O,O-Acetals by Tosylate Elimination

Reuther, Wolfgang,Ruland, Alfred,Baus, Ulf

, p. 235 - 240 (2007/10/02)

Reaction of the alcohols 4 and 5 with p-toluensulfonyl chloride leads to the sulfonic esters 6 and 7, respectively, which on treatment with potassium tert-butylate easily react to give the ketene O,N-acetals 8 and O,O-acetals 9, respectively.The (E/Z) isomers 8 arising from the elimination reaction of 7 were identified by their 1H-NMR data after X-ray analysis of one of the isomers of 8e.On one example it is shown that the elimination reaction proceeds stereoselectively "anti".

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