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1243148-31-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1243148-31-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,3,1,4 and 8 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1243148-31:
123 % 10 = 3
So 1243148-31-3 is a valid CAS Registry Number.

1243148-31-3Relevant articles and documents

Preparation of cobalt-containing ligands with NHC- And/or P-coordinating sites and their application in heck reactions: The formation of an unexpected cobalt-containing zwitterionic complex

Guo, Chi-Shing,Weng, Chia-Ming,Hong, Fung-E.

, p. 3220 - 3228 (2010)

An unexpected cobalt-containing zwitterionic complex, [{(μ-PPh 2CH2PPh2)Co2(CO)4}(μ, η-(R1)PC=CCH2(R2)}] (8 R1 = Ph2Bz; R2 = 3-CoBr 3-1-benzimidazole), has been obtained during an attempt to modify the imidazole moiety in the alkyne-bridging dicobalt complex. [{(μ-PPh 2CH2PPh2)Co2(CO)4)-{μ, η-Ph2PC=CCH2(IM)}] (5; IM = benzimidazole) to a carbene-type substituent by reaction with benzyl, bromide. As revealed in the crystal structure of 8, it is clear that the benzyl bromide was nucleophilically attacked by the phosphane moiety of 5 with the result the addition of the benzyl, moiety. This phosphane site in 8 is in a tetrahedral environment and presumably cationic in nature. In addition, an unusual anionic species CoBr 3- was found to have attached itself to the free nitrogen site of the imidazole moiety. Thus 8 can be regarded as an unusual metal-containing zwitterionic complex. When the phosphane site of 5 was replaced by a non-reactive substituent, for example, [{(μ-PPh2CH 2PPh2)Co2(CO)4}(μ,η-RC= CCH2(IM)}] (5′: R = H; 5-O: R = Ph2(O)P), nucleophilic attack took place exclusively on the imidazole moiety and led to the formation of [{(μ-PPh2CH2PPh2)Co 2(CO)4}(μ,η-RC=CCH2(IM′)} +]Br- [9′: R = H; 9-O: R = Ph2(O)P; IM′ = 3-benzyl-1H-benzimidazole]. Complex 9′ could act as a carbene precursor, which was demonstrated by the formation of the bis-9′- coordinated palladium complex [trans-({(μPPh2CH 2PPh2)Co2(CO)4}{μ,η-HC= CCH2(IM′)})2PdBr2] (11) on treatment with [Pd(cod)Cl2]. Fair-to-good efficiencies were observed in Heck reactions employing either isolated 11 or in situ 9′/PdCl2 (2:1) as the catalytic precursor.

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