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304857-39-4

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304857-39-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 304857-39-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,4,8,5 and 7 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 304857-39:
(8*3)+(7*0)+(6*4)+(5*8)+(4*5)+(3*7)+(2*3)+(1*9)=144
144 % 10 = 4
So 304857-39-4 is a valid CAS Registry Number.

304857-39-4Upstream product

304857-39-4Relevant articles and documents

New Lewis-Basic N-Oxides as Chiral Organocatalysts in Asymmetric Allylation of Aldehydes

Malkov, Andrei V.,Bell, Mark,Orsini, Monica,Pernazza, Daniele,Massa, Antonio,Herrmann, Pavel,Meghani, Premji,Kocovsky, Pavel

, p. 9659 - 9668 (2007/10/03)

Allylation of aromatic and heteroaromatic aldehydes 1a-k with allyltrichlorosilane 2 can be catalyzed by the new heterobidentate, terpene-derived bipyridine N-monoxides 4, 6a,b, and 8-11 (≤10 mol %) to afford (S)-(-)-3 with high enantioselectivities (≤99% ee). The stereochemical outcome has been found to be controlled by the axial chirality of the catalyst, which in turn is determined by the central chirality of the annulated terpene units. Solvent effects on the conversion and the level of asymmetric induction have been elucidated, and MeCN has been identified as the optimal solvent for these catalysts.

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