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31683-47-3

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31683-47-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 31683-47-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,6,8 and 3 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 31683-47:
(7*3)+(6*1)+(5*6)+(4*8)+(3*3)+(2*4)+(1*7)=113
113 % 10 = 3
So 31683-47-3 is a valid CAS Registry Number.

31683-47-3Relevant articles and documents

Pd-catalyzed sp-sp3cross-coupling of benzyl bromides using lithium acetylides

Buter, Jeffrey,Doze, Anna M.,Feringa, Ben L.,Mondal, Anirban,Visser, Paco

, p. 7529 - 7532 (2021/08/05)

Organolithium-based cross-coupling reactions have emerged as an indispensable method to construct C-C bonds. These transformations have proven particularly useful for the direct and fast coupling of various organolithium reagents (sp, sp2, and sp3) with aromatic (pseudo) halides (sp2). Here we present an efficient method for the cross-coupling of benzyl bromides (sp3) with lithium acetylides (sp). The reaction proceeds within 10 min at room temperature and can be performed in the presence of organolithium-sensitive functional groups such as esters, nitriles, amides and boronic esters. The potential application of the methodology is demonstrated in the preparation of key intermediates used in pharmaceuticals, chemical biology and natural products.

Palladium-Catalyzed Coupling of Terminal Alkynes with Benzyl Ammonium Salts

Xu, Silin,Zhang, Zhenming,Han, Chunyu,Hu, Wenkai,Xiao, Tiwen,Yuan, Yanan,Zhao, Junfeng

, p. 12192 - 12197 (2019/10/11)

A highly efficient palladium-catalyzed Sonogashira coupling of benzylic ammonium salts with terminal alkynes is developed. This strategy provides a facile access to a series of internal alkyne derivatives in moderate to excellent yields via C-N bond cleavage and C(sp3)-C(sp) bond formation. The broad substrate scope and high functional group tolerance make this reaction attractive for organic synthesis.

Propargylsilanes as Reagents for Synergistic Gold(I)-Catalyzed Propargylation of Carbonyl Compounds: Isolation and Characterization of σ-Gold(I) Allenyl Intermediates

Fernández, Sergio,González, Jairo,Santamaría, Javier,Ballesteros, Alfredo

supporting information, p. 10703 - 10707 (2019/06/25)

Reported herein is the isolation and characterization, for the first time, of a σ-gold allenyl complex as an intermediate in gold catalysis. This intermediate was captured during the study of a novel gold(I)-catalyzed propargylation of carbonyl compounds with propargylsilanes. Notably, the gold-catalyzed propargylation reaction, which proceeds with aldehydes and ketones, can be driven to the formation of either homopropargyl silyl ethers or the in situ synthesis of corresponding 2-silyl-4,5-dihydrofurans.

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