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20498-68-4

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20498-68-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20498-68-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,9 and 8 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 20498-68:
(7*2)+(6*0)+(5*4)+(4*9)+(3*8)+(2*6)+(1*8)=114
114 % 10 = 4
So 20498-68-4 is a valid CAS Registry Number.

20498-68-4Relevant articles and documents

Cobalt Catalyst Determines Regioselectivity in Ring Opening of Epoxides with Aryl Halides

Potrz?saj, Aleksandra,Musiejuk, Mateusz,Cha?adaj, Wojciech,Giedyk, Maciej,Gryko, Dorota

supporting information, p. 9368 - 9376 (2021/06/28)

Ring-opening of epoxides furnishing either linear or branched products belongs to the group of classic transformations in organic synthesis. However, the regioselective cross-electrophile coupling of aryl epoxides with aryl halides still represents a key challenge. Herein, we report that the vitamin B12/Ni dual-catalytic system allows for the selective synthesis of linear products under blue-light irradiation, thus complementing methodologies that give access to branched alcohols. Experimental and theoretical studies corroborate the proposed mechanism involving alkylcobalamin as an intermediate in this reaction.

Ni-catalysed regioselective 1,2-diarylation of unactivated olefins by stabilizing Heck intermediates as pyridylsilyl-coordinated transient metallacycles

Thapa, Surendra,Dhungana, Roshan K.,Magar, Rajani Thapa,Shrestha, Bijay,Kc, Shekhar,Giri, Ramesh

, p. 904 - 909 (2018/02/07)

We report a Ni-catalysed diarylation of unactivated olefins in dimethylpyridylvinylsilane by intercepting Heck C(sp3)-NiX intermediates, derived from aryl halides, with arylzinc reagents. This approach utilizes a modifiable pyridylsilyl moiety as a coordinating group that plays a dual role of intercepting oxidative addition species to promote Heck carbometallation, and stabilizing the Heck C(sp3)-NiX intermediates as transient metallacycles to suppress β-hydride elimination, and facilitate transmetalation/reductive elimination. This method affords 1,2-diarylethylsilanes, which can be readily oxidized to 1,2-diarylethanols that occur as structural motifs in 3-aryl-3,4-dihydroisocoumarin and dihydrostilbenoid natural products.

Catalytic functionalization of methyl group on silicon: Iridium-catalyzed C(sp3)-H borylation of methylchlorosilanes

Ohmura, Toshimichi,Torigoe, Takeru,Suginome, Michinori

supporting information, p. 17416 - 17419,4 (2012/12/12)

A methyl group of methylchlorosilanes undergoes C-H borylation in an iridium-catalyzed reaction with bis(pinacolato)diboron in cyclohexane at 80 °C, giving (borylmethyl)chlorosilanes selectively.

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