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33131-14-5

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33131-14-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33131-14-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,1,3 and 1 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 33131-14:
(7*3)+(6*3)+(5*1)+(4*3)+(3*1)+(2*1)+(1*4)=65
65 % 10 = 5
So 33131-14-5 is a valid CAS Registry Number.

33131-14-5Relevant articles and documents

Carbonylation of Acetylenes under Water Gas Shift Conditions: A New Method for Synthesis of Furan-2(5H)-ones

Doyama, Kazuo,Joh, Takashi,Onitsuka, Kiyotaka,Shiohara, Tomoo,Takahashi, Shigethosi

, p. 649 - 650 (1987)

Under water gas shift conditions acetylenes are selectively converted into furan-2(5H)-ones with catalysis by rhodium carbonyl clusters.

Furan-2(3H)- and -2(5H)-ones. Part 6. Di-?-methane rearrangement of the α-substituted 4-benzylfuran-2(5H)-one system

Muraoka, Osamu,Tanabe, Genzoh,Higachiura, Mie,Minematsu, Toshie,Momose, Takefumi

, p. 1437 - 1444 (2007/10/02)

The effect of the 'central methane' substitution on the di-?-methane rearrangement in 4-benzyl-2,5-dihydrofuran-2-ones 8a-d was investigated.Significant enhancement of efficiency in the rearrangement leading in high combined yields to two isomeric products, endo-12 and exo-12, is discussed in terms of both the substituent effects at the benzylic carbon and the restrained features of the ring-enrolled ?-system.The origin of the difference in chemoselectivity compared with that of the 3-benzyl counterpart 5 where a photoarylated product 6 resulted upon photoirradiation was also investigated, and was rationalized by postulating a higher reactivity at the β-position of the enone system.

The remarkable cobalt- and phase-transfer-catalyzed carbonylation of epoxy alcohols: A formal triple carbonylation reaction

Alper, Howard,Eisenstat, Amichai,Satyanarayana, Nistala

, p. 7060 - 7061 (2007/10/02)

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