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135746-09-7

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135746-09-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 135746-09-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,5,7,4 and 6 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 135746-09:
(8*1)+(7*3)+(6*5)+(5*7)+(4*4)+(3*6)+(2*0)+(1*9)=137
137 % 10 = 7
So 135746-09-7 is a valid CAS Registry Number.

135746-09-7Relevant articles and documents

Synthesis of 2'-hydroxychalcone epoxides

Adams,Main

, p. 4959 - 4978 (2007/10/05)

Various preparations of some 2'-tetrahydropyran-2-yloxychalcone epoxides and removal of their tetrahydropyranyl (THP) protective groups in slightly aqueous acidic dioxane are described. So synthesised were 2'-hydroxy-6'-isopropoxy- and 2'-hydroxy-6'-methoxychalcone epoxide, as well as the 2-CF3, 4-Cl and 4-NO2 analogues of the latter. 2',4'-dihydroxy-6'-methoxychalcone epoxide was similarly prepared. In some other 6'-methoxy cases protective group removal was accompanied by epoxide solvolysis and the corresponding α,β-dihydroxydihydrochalcone was the only isolable product [2-OMe, 4-OMe, 3,4,5-(OMe)3 cases] or a byproduct [4-Me case]. Similarly prepared by THP removal were 2'-hydroxy-4'-methoxychalcone epoxide and 2',4'-dihydroxychalcone epoxide, whereas an attempt to convert 2',6'-ditetrahydropyranyloxychalcone epoxide into 2',6'-dihydroxychalcone epoxide gave the product of cyclisation of the latter, 3,5-dihydroxyflavanone.

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