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169898-21-9

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169898-21-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 169898-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,9,8,9 and 8 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 169898-21:
(8*1)+(7*6)+(6*9)+(5*8)+(4*9)+(3*8)+(2*2)+(1*1)=209
209 % 10 = 9
So 169898-21-9 is a valid CAS Registry Number.

169898-21-9Upstream product

169898-21-9Relevant articles and documents

Ring A building blocks for taxoids and taxamycins

Tjepkema, Michael W.,Wilson, Peter D.,Audrain, Helene,Fallis, Alex G.

, p. 1215 - 1224 (1997)

The synthesis of a series of oxygenated cyclohexene ring A synthons 20, 22-27, 34, 36, and 37 that possess suitable functionality for further elaboration for taxoid synthesis are described. These compounds have been prepared from β-ionone by a series of oxidative and addition reactions or alternatively by Lewis acid catalyzed Diels-Alder cycloadditions with the oxygen-containing trimethyl substituted dienes 31 and 33. The syntheses of a series of oxygenated cyclohexene ring A synthons 20, 22-27, 34, 36, and 37 that possess suitable functionality for further elaboration for taxoid synthesis are described. These compounds have been prepared from β-ionone by a series of oxidative and addition reactions or alternatively by Lewis acid catalyzed Diels-Alder cycloadditions with the oxygen-containing trimethyl substituted dienes 31 and 33.

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