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91667-55-9

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91667-55-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91667-55-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,6,6 and 7 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 91667-55:
(7*9)+(6*1)+(5*6)+(4*6)+(3*7)+(2*5)+(1*5)=159
159 % 10 = 9
So 91667-55-9 is a valid CAS Registry Number.

91667-55-9Relevant articles and documents

THE SYNTHESIS OF 1,2:5,6-DI-O-ISOPROPYLIDENE-D-MANNITOL: A COMPARATIVE STUDY

Kuszmann, Janos,Tomori, Eva,Meerwald, Ingrid

, p. 87 - 100 (2007/10/02)

Three different methods of acetonation of D-mannitol using (a) acetone and zinc chloride, (b) 2,2-dimethoxypropane, 1,2-dimethoxyethane, and tin(II)chloride, and (c) 2-methoxypropane, N,N-dimethylformamide, and p-toluenesulfonic acid were studied in detail and compared, using gas-liquid chromatographic techniques.In each reaction, isomeric diacetals are formed, but method a gives the 1,2:5,6-diacetal in the highest yield (63percent).Methods b and c give a more complex mixture of acetals than proposed in the literature, and both methods are less economical than a.A new 1,2:3,6:4,5-tri-O-isopropylidene-D-mannitol could be separated, and its graded hydrolysis was compared to that of the 1,2:3,4:5,6-triacetal.

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