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87143-17-7

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87143-17-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87143-17-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,1,4 and 3 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 87143-17:
(7*8)+(6*7)+(5*1)+(4*4)+(3*3)+(2*1)+(1*7)=137
137 % 10 = 7
So 87143-17-7 is a valid CAS Registry Number.

87143-17-7Relevant articles and documents

In Situ Preparation of (μ-Chloro)(μ-methylene)bis(cyclopentadienyl)(dimethylaluminum)titanium (Tebbe's Reagent)

Cannizzo, Louis F.,Grubbs, Robert H.

, p. 2386 - 2387 (1985)

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Cobalt-Catalyzed Desymmetric Isomerization of Exocyclic Olefins

Lan, Yu,Liu, Qiang,Liu, Shihan,Liu, Xufang,Rong, Xianle

supporting information, p. 20633 - 20639 (2021/12/17)

Chiral cyclic olefins, 1-methylcyclohexenes, are versatile building blocks for the synthesis of pharmaceuticals and natural products. Despite the prevalence of these structural motifs, the development of efficient synthetic methods remains an unmet challenge. Herein we report a novel desymmetric isomerization of exocyclic olefins using a series of newly designed chiral cobalt catalysts, which enables a straightforward construction of chiral 1-methylcyclohexenes with diversified functionalities. The synthetic utility of this methodology is highlighted by a concise and enantioselective synthesis of a natural product, β-bisabolene. The versatility of the reaction products is further demonstrated by multifarious derivatizations.

Insertion of Alkylidene Carbenes into B-H Bonds

Yang, Ji-Min,Guo, Feng-Kai,Zhao, Yu-Tao,Zhang, Qiao,Huang, Ming-Yao,Li, Mao-Lin,Zhu, Shou-Fei,Zhou, Qi-Lin

supporting information, p. 20924 - 20929 (2020/12/23)

We have developed a protocol for insertion of alkylidene carbenes into the B-H bonds of amine-borane adducts, enabling, for the first time, the construction of C(sp2)-B bonds by means of carbene-insertion reactions. Various acyclic and cyclic alkenyl borane-amine adducts were prepared from readily accessible starting materials in good to high yields and were subsequently subjected to a diverse array of functional group transformations. The unprecedented spiro B-N heterocycles prepared in this study have potential utility as building blocks for the synthesis of pharmaceuticals. Preliminary mechanistic studies suggest that insertion of the alkylidene carbenes into the B-H bonds of the amine-borane adducts proceeds via a concerted process involving a three-membered-ring transition state.

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