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89597-28-4

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89597-28-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 89597-28-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,5,9 and 7 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 89597-28:
(7*8)+(6*9)+(5*5)+(4*9)+(3*7)+(2*2)+(1*8)=204
204 % 10 = 4
So 89597-28-4 is a valid CAS Registry Number.

89597-28-4Relevant articles and documents

Tandem Mukaiyama Michael-aldol reactions catalysed by samarium diiodide

Giuseppone, Nicolas,Collin, Jacqueline

, p. 8989 - 8998 (2007/10/03)

Samarium diiodide is an efficient precatalyst for tandem Michael-aldol reactions, which allow the formation of two carbon-carbon bonds by successive additions of a ketene silyl acetal and an aldehyde on cyclic α,β-unsaturated ketones. The adducts are isolated as silyl ethers, in good yields, and in some cases with high diastereoselectivities when the reactions are performed at low temperatures. Comparative study of the activities of other lanthanide iodides for the same tandem reactions is presented. A key step for a formal synthesis of PGF2α has been performed by a tandem Michael-aldol samarium-catalysed sequence.

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