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33810-04-7

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33810-04-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33810-04-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,8,1 and 0 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 33810-04:
(7*3)+(6*3)+(5*8)+(4*1)+(3*0)+(2*0)+(1*4)=87
87 % 10 = 7
So 33810-04-7 is a valid CAS Registry Number.

33810-04-7Relevant articles and documents

Enantioselective synthesis of 3,4-disubstituted cis- and trans-1,2,5-thiadiazolidine-1,1-dioxides as precursors for chiral 1,2-diamines

Schüttler, Christian,Li-B?hmer, Zhen,Harms, Klaus,Von Zezschwitz, Paultheo

supporting information, p. 800 - 803 (2013/04/24)

Both, cis- and trans-3,4-disubstituted thiadiazolidines 5 and 6 can enantioselectively be obtained from thiadiazoles 2 which, in turn, are efficiently prepared from the respective 1,2-diketone by an improved protocol. An asymmetric ruthenium-catalyzed transfer hydrogenation followed by a diastereoselective hydride addition furnishes exclusively the cis-isomers 5 which, under acidic conditions, undergo a novel isomerization into the trans-isomers 6. These cyclic sulfamides can be transformed into 1,2-diamines as well as 2,3-diamino acids.

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