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138996-81-3

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138996-81-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138996-81-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,9,9 and 6 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 138996-81:
(8*1)+(7*3)+(6*8)+(5*9)+(4*9)+(3*6)+(2*8)+(1*1)=193
193 % 10 = 3
So 138996-81-3 is a valid CAS Registry Number.

138996-81-3Relevant articles and documents

Copper-catalyzed C–P cross-coupling of secondary phosphines with (hetero)aromatic bromide

Li, Chun-Jing,Lü, Jing,Zhang, Zhi-Xun,Zhou, Kun,Li, Yan,Qi, Guang-Hui

, p. 4547 - 4562 (2018)

A novel and convenient approach to the synthesis of various tertiary phosphines via a copper-catalyzed cross-coupling of (hetero)aromatic bromide with secondary phosphines has been developed. The reaction employs cheap copper as the catalyst, 2,6-bis(N-methylaminomethyl)pyridine (L4) as a perfect ligand and KOtBu as a base; all reactions are carried out under argon atmosphere. A variety of sterically hindered and/or functionalized substrates were found to react under these reaction conditions to provide products in good to excellent yields. Moreover, ten new tertiary phosphines were first reported in this process.

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