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125130-99-6

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125130-99-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 125130-99-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,5,1,3 and 0 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 125130-99:
(8*1)+(7*2)+(6*5)+(5*1)+(4*3)+(3*0)+(2*9)+(1*9)=96
96 % 10 = 6
So 125130-99-6 is a valid CAS Registry Number.

125130-99-6Relevant articles and documents

53. Acid-Catalyzed Cyclization Rections of Substituted Acetylenic Ketones: A New Approach for the Synthesis of 3-Halofurans, Flavones, and Styrylchromones

Obrecht, Daniel

, p. 447 - 456 (2007/10/02)

Acetylenic acetals of type I (Scheme 1) and acetylenic ketones of type III (Scheme 1), 37 and 38 (Scheme 7) are versatile synthetic precursors for the synthesis of various heterocycles by acid-catalyzed cyclization reactions.By this way, substituted 3-halofurans of type II and IV (Scheme 1) and flavones and styrylchromones (Scheme 7) can be synthesized in good-to-excellent yields.The high degree of regioselectivity in the synthesis of the 3-halofurans (Scheme 4) is the result of the regioselective β-addition of HX (X = Cl, Br, I) to the acetylenic aldehyde and acetylenic ketone moieties.A possible mechanism is depicted in Scheme 5.Since 3-halofurans can easily be metalated and substituted, this approach constitutes a new synthesis of highly substituted furans.

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