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5866-20-6

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5866-20-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5866-20-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,8,6 and 6 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 5866-20:
(6*5)+(5*8)+(4*6)+(3*6)+(2*2)+(1*0)=116
116 % 10 = 6
So 5866-20-6 is a valid CAS Registry Number.

5866-20-6Relevant articles and documents

Catalytic carbonylation of β-lactones to succinic anhydrides

Getzler, Yutan D. Y. L.,Kundnani, Vinod,Lobkovsky, Emil B.,Coates, Geoffrey W.

, p. 6842 - 6843 (2004)

A well-defined,highly active and selective catalyst for the synthesis of succinic anhydrides from CO and β-lactones is reported. At 200 psi of CO, the catalyst [(N,N′-bis(3,5-di-tert-butylsalicylidene)phenylenediamino)Al(THF)2][Co(CO)4] carbonylates β-propiolactones to succinic anhydrides in high yield. (R)-β-Butyrolactone is carbonylated to (S)-methylsuccinic anhydride with clean inversion of stereochemistry, while cis-2,3-dimethyl-β-propiolactone yields exclusively trans-2,3-dimethylsuccinic anhydride. These data are consistent with a mechanism involving nucleophilic attack by [Co(CO)4]- on the β carbon of the lactone, followed by CO insertion and anhydride formation. Copyright

AN IMPROVED PROCEDURE FOR THE PREPARATION AND RESOLUTION OF DL-2,3-DIMETHYLSUCCINIC ACID

Sutton, Scott C.,Nantz, Michael H.,Hitchcock, Shawn R.

, p. 39 - 44 (2007/10/03)

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