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17284-66-1

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17284-66-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 17284-66-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,2,8 and 4 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 17284-66:
(7*1)+(6*7)+(5*2)+(4*8)+(3*4)+(2*6)+(1*6)=121
121 % 10 = 1
So 17284-66-1 is a valid CAS Registry Number.

17284-66-1Relevant articles and documents

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Roberts,Thompson

, p. 3488,3492 (1971)

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Syntheses of Highly Substituted Benzenes via Diels-Alder Reactions with 2H-Pyran-2-ones

Ziegler, Thomas,Layh, Marcus,Effenberger, Franz

, p. 1347 - 1356 (2007/10/02)

The 2H-pyran-2-ones (α-pyrones) 1 react as dienes in Diels-Alder reactions with acetylene derivatives.The primarely formed cycloadducts immediately aromatize to benzenes by CO2 elimination.Thus, methyl acetylenedicarboxylate (2a) gives dimethyl phthalates 3, and methyl acetylenediphosphonate (2b) gives dimethyl 1,2-phenylenediphosphonates 8.The reactions of 1-(dimethylamino)-1-methoxyethene (9) with 1 regioselectively produce N,N-dimethylanilines 10 and isomeric homophthalate derivatives 12.Naphthoquinones 14 could be generated from 1,4-benzoquinone (13) and 1 in the presence of acetic anhydride and Pd/C.Hydroxy-2H-pyran-2-ones 4 react via their trimethylsilyl ether 6 analogously with 2a to give dimethyl (trimethylsiloxy)phthalates 7 which are easily converted to phenols 5 by acid-catalyzed hydrolysis.

Structure of diospyrin

Sidhu,Pardhasaradhi

, p. 1313 - 1316 (2007/10/13)

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