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222633-66-1

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222633-66-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 222633-66-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,2,6,3 and 3 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 222633-66:
(8*2)+(7*2)+(6*2)+(5*6)+(4*3)+(3*3)+(2*6)+(1*6)=111
111 % 10 = 1
So 222633-66-1 is a valid CAS Registry Number.

222633-66-1Upstream product

222633-66-1Relevant articles and documents

Synthesis of fluorenone and anthraquinone derivatives from aryl- and aroyl-substituted propiolates

Puenner, Florian,Schieven, Justin,Hilt, Gerhard

supporting information, p. 4888 - 4891 (2013/10/08)

Fluorenone derivatives were generated from aryl-substituted propiolates via a cobalt-catalyzed Diels-Alder reaction/DDQ-oxidation and Friedel-Crafts-type cyclization. Several functional groups are tolerated, and good to excellent overall yields (up to 89%) could be achieved. For the synthesis of anthraquinone derivatives, aroyl-substituted propiolates were applied in a zinc iodide catalyzed Diels-Alder reaction with 1,3-dienes. The subsequent DDQ oxidation and Friedel-Crafts-type cyclization led to symmetrical as well as some unsymmetrical anthraquinones in good to excellent yields of up to 87% over the three-step reaction sequence.

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