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209911-11-5

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209911-11-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 209911-11-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,9,9,1 and 1 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 209911-11:
(8*2)+(7*0)+(6*9)+(5*9)+(4*1)+(3*1)+(2*1)+(1*1)=125
125 % 10 = 5
So 209911-11-5 is a valid CAS Registry Number.

209911-11-5Relevant articles and documents

A facile synthesis of functionalized catechols

Li, Chaozhong,Angelici, Robert J.

, p. 4235 - 4238 (1998)

A general route to functionalized catechols is achieved by the reaction of 3,6-di(chloromethyl)-4,5-dimethyl-catechol with various nucleophiles in the presence of a base. The reactions are proposed to occur by way of a dehydrochlorinated intermediate which undergoes Michael additions to give the catechol products.

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