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149694-49-5

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149694-49-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 149694-49-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,9,6,9 and 4 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 149694-49:
(8*1)+(7*4)+(6*9)+(5*6)+(4*9)+(3*4)+(2*4)+(1*9)=185
185 % 10 = 5
So 149694-49-5 is a valid CAS Registry Number.

149694-49-5Relevant articles and documents

Efficient synthesis of furan-2-ylacetates, 7-(alkoxycarbonyl)benzofurans, and 7-(alkoxycarbonyl)-2,3-dihydrobenzofurans based on cyclization reactions of free and masked dianions: A "cyclization/dehydrogenation" strategy

Bellur, Esen,Langer, Peter

, p. 10013 - 10029 (2005)

A variety of furan-2-ylacetates have been prepared by dehydrogenation of monocyclic 2-alkylidene-tetrahydrofurans, which are readily available by cyclizations of open-chained 1,3-dicarbonyl dianions with 1-bromo-2- chloroethane. 5′H-[2,3′]Bifuranyl-2′-one

Efficient synthesis of functionalized furans and benzofurans based on a '[3+2] cyclization/oxidation' strategy

Bellur, Esen,Freifeld, Ilia,Langer, Peter

, p. 2185 - 2187 (2005)

Functionalized furans and benzofurans were prepared by DDQ oxidation of 2-alkylidenetetrahydrofurans, which are readily available by one-pot cyclizations of 1,3-dicarbonyl dianions or 1,3-bis-silyl enol ethers.

Regioselective synthesis of functionalized furans by cyclization of 1,3-bis-silyl enol ethers with 1-chloro-2,2-dimethoxyethane

Bellur, Esen,Goerls, Helmar,Langer, Peter

, p. 2074 - 2090 (2007/10/03)

Cyclization of 1,3-bis-silyl enol ethers with 1-chloro-2,2-dimethoxyethane allowed an efficient, regio- and diastereo-selective synthesis of a variety of 2-alkylidene-4-methoxy-tetrahydrofurans. The TFA-mediated elimination of methanol resulted in the formation of functionalized furans. Simi larly, 2,3,3a,4,5,6-hexahydro-2,3-benzofurans were prepared and transformed into 4,5,6,7-tetrahydro-2,3-benzofurans by treatment with TFA Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.

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