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1437325-46-6

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1437325-46-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1437325-46-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,3,7,3,2 and 5 respectively; the second part has 2 digits, 4 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1437325-46:
(9*1)+(8*4)+(7*3)+(6*7)+(5*3)+(4*2)+(3*5)+(2*4)+(1*6)=156
156 % 10 = 6
So 1437325-46-6 is a valid CAS Registry Number.

1437325-46-6Downstream Products

1437325-46-6Relevant articles and documents

Symmetric and unsymmetric 3,3′-linked bispyrroles via ring-enlargement reactions of furan-derived donor-acceptor cyclopropanes

Kaschel, Johannes,Schneider, Tobias F.,Kratzert, Daniel,Stalke, Dietmar,Werz, Daniel B.

, p. 3494 - 3509 (2013/06/05)

A short and concise sequence for the synthesis of symmetrically and unsymmetrically substituted 3,3′-linked bispyrroles is described. Furan as a starting material is subjected to a twofold cyclopropanation by a diazo ester. Conversion of the ester functionalities to the respective ketones is achieved via Weinreb amide formation and the attack of a Grignard reagent. In the presence of amines the ketone moieties form imines that rearrange by ring-enlargement of the three-membered to the five-membered rings. In situ generated dihydropyrrole moieties eliminate water and afford aromatic pyrrole units. Unsymmetric bispyrroles are obtained by using different cyclopropanating agents or varying Grignard reagents for ketone formation before the addition of amines initiates the cascade to the respective bispyrroles. The Royal Society of Chemistry.

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