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117820-42-5

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117820-42-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 117820-42-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,8,2 and 0 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 117820-42:
(8*1)+(7*1)+(6*7)+(5*8)+(4*2)+(3*0)+(2*4)+(1*2)=115
115 % 10 = 5
So 117820-42-5 is a valid CAS Registry Number.

117820-42-5Upstream product

117820-42-5Downstream Products

117820-42-5Relevant articles and documents

IODINATION AND DEUTERATION OF CATECHIN DERIVATIVES

Kiehlmann, E.,Lehto, N.,Cherniwchan, D.

, p. 2431 - 2439 (2007/10/02)

The preparation and 1H and 13C nuclear magnetic reonance spectra of ten monoiodocatechin derivatives are described.The iodination of catechin with N-iodosuccinimide (NIS) takes place regiospecifically at C-6 in acetone but preferentially at C-8 in dimethylformamide; both products can be derivatized at oxygen in alkali medium but lose iodine in the presence of acid. 3',4',5,7,-Tetra-O-methylcatechin reacts with NIS regiospecifically at C-8 while catechin pentaacetate resists iodination.The debromination of 6-bromo- and 6,8-dibromocatechin with sodium sulfite in CD3CN/D2O is accompained by H/D-exchange at C-6 and C-8.The synthesis of catechin pentaacetate from partially deuterated catechin and its conversion to terta-O-methylcatechin proceed without H/D-exchange and permit distinction between the H-6 and H-8 chemical shifts.

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