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91970-87-5

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91970-87-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91970-87-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,9,7 and 0 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 91970-87:
(7*9)+(6*1)+(5*9)+(4*7)+(3*0)+(2*8)+(1*7)=165
165 % 10 = 5
So 91970-87-5 is a valid CAS Registry Number.

91970-87-5Relevant articles and documents

Synthesis of new bipyridine N,N′-dioxides and their application in asymmetric allylation of benzaldehyde and aldol addition to acetophenone

Bedná?ová, Eva,Ne?as, David,Císa?ová, Ivana,Du?ek, Michal,Lamaty, Frédéric,Kotora, Martin

, p. 29 - 48 (2018/11/23)

Abstract: Two methods for the synthesis of new axially chiral bipyridine N,N′-dioxides based on catalytic [2+2+2] cyclotrimerization of diynes with nitriles were developed. The N,N′-dioxides were used as catalysts in enantioselective allylation of benzaldehyde with allyltrichlorosilane and aldol reaction of trichlorosilyl ketene acetal of methyl acetate with acetophenone. Graphical abstract: [Figure not available: see fulltext.].

Photoaddition reactions of acetylpyridines with silyl ketene acetals: SET vs [2 + 2]-cycloaddition pathways

Cho, Dae Won,Park, Hea Jung,Yoon, Ung Chan,Lee, Hyang-Yeol,Mariano, Patrick S.

, p. 10304 - 10313 (2013/01/15)

Photoaddition reactions of silyl ketene acetals with 2-, 3- and 4-acetylpyridine have been explored. The results show that the acetylpyridines react with an electron rich, dimethyl-substituted silyl ketene acetal via a pathway in which excited state singl

Base-catalyzed dehydrogenative Si-o coupling of dihydrosilanes: Silylene protection of diols

Grajewska, Agnieszka,Oestreich, Martin

supporting information; experimental part, p. 2482 - 2484 (2010/11/18)

The direct dehydrogenative coupling of 1,3- and 1,4-diols and dihydrosilanes is efficiently catalyzed by CsO(10 mol%), cleanly affording six- and seven-membered 1,3-dioxo-2-silacycles with dihydrogen as the sole by-product. Conversely, 1,2-diols do not yield the expected 1,3-dioxo-2- silacyclopentanes, essentially forming cyclic disiloxanes instead. Aside from the synthetic convenience, the procedure itself is also useful for straight-forward diol derivatization prior to GLC analysis. Georg Thieme Verlag Stuttgart · New York.

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