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497239-46-0

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497239-46-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 497239-46-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,9,7,2,3 and 9 respectively; the second part has 2 digits, 4 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 497239-46:
(8*4)+(7*9)+(6*7)+(5*2)+(4*3)+(3*9)+(2*4)+(1*6)=200
200 % 10 = 0
So 497239-46-0 is a valid CAS Registry Number.

497239-46-0Downstream Products

497239-46-0Relevant articles and documents

Unusual cyclodimerization of small cyclic ethers via neighboring carbonyl-group participation and cation transfer

Kanoh, Shigeyoshi,Nishimura, Tomonari,Naka, Masashi,Motoi, Masatoshi

, p. 7065 - 7074 (2007/10/03)

Oxetanes having both a carbonyl functional group and a phenyl group at the 3-position bring about unusual cyclodimerization under the influence of trifluoromethanesulfonic acid, to give a cis/trans-isomer mixture of substituted 1,3-dioxanes via neighboring carbonyl-group participation, cation transfer including phenonium rearrangement, and cyclodimerization. Oxiranes having a carbonyl functional group also undergo a similar cyclodimerization to form a 1,3-dioxolane ring. No phenyl substituent is required in the cases of the oxiranes, because the cation transfer process involves a 1,2-hydride shift alone. These five- and six-membered cyclic acetals are quite different from ring-expanded cyclic ether dimers expected simply from the back-biting reaction known in the cationic ring-opening polymerization of oxiranes and oxetanes.

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