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164171-80-6

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164171-80-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 164171-80-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,4,1,7 and 1 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 164171-80:
(8*1)+(7*6)+(6*4)+(5*1)+(4*7)+(3*1)+(2*8)+(1*0)=126
126 % 10 = 6
So 164171-80-6 is a valid CAS Registry Number.

164171-80-6Relevant articles and documents

Studies on the Lithiation, Borylation, and 1,2-Metalate Rearrangement of O-Cycloalkyl 2,4,6-Triisopropylbenzoates

Mykura, Rory C.,Songara, Pradip,Luc, Eugenia,Rogers, Jack,Stammers, Ellie,Aggarwal, Varinder K.

, p. 11436 - 11441 (2021)

A broad range of acyclic primary and secondary 2,4,6-triisopropylbenzoate (TIB) esters have been used in lithiation-borylation reactions, but cyclic TIB esters have not. We have studied the use of cyclic TIB esters in lithiation-borylation reactions and looked at the effect of ring size (3- → 6-membered rings) on the three key steps of the lithiation-borylation protocol: deprotonation, borylation and 1,2-metalate rearrangement. Although all rings sizes could be deprotonated, the cyclohexyl case was impractically slow, and the cyclopentyl example underwent α-elimination faster than deprotonation at ?78 °C and so could not be used. Both cyclobutyl and cyclopropyl cases underwent rapid borylation, but only the cyclobutyl substrate underwent 1,2-metalate rearrangement. Thus, the cyclobutyl TIB ester occupies a “Goldilocks zone,” being small enough for deprotonation and large enough to enable 1,2-migration. The generality of the reaction was explored with a broad range of boronic esters.

Terminal Trifluoromethylation of Ketones via Selective C-C Cleavage of Cycloalkanols Enabled by Hypervalent Iodine Reagents

Wu, Shuang,Li, Junzhao,He, Ru,Jia, Kunfang,Chen, Yiyun

supporting information, p. 9204 - 9209 (2021/11/30)

We report the first terminal trifluoromethylation at aryl and alkyl ketones' ?, or more remote sites via the selective C-C bond cleavage of cycloalkanols. The noncovalent interactions between alcohols and hypervalent iodines(III) reagents were disclosed to activate both alcohols and the Togni I reagent in the dual photoredox/copper catalysis for the transformation. This reaction was scalable to the gram-scale synthesis, applicable to the structurally complex steroid trifluoromethylation, and extendable to the pentafluoroethylation.

Regioselective Electrochemical Cyclobutanol Ring Expansion to 1-Tetralones

Petti, Alessia,Natho, Philipp,Lam, Kevin,Parsons, Philip J.

supporting information, p. 854 - 858 (2021/01/12)

A mild electrochemical method for the regioselective preparation of 1-tetralones under environmentally friendly conditions from readily available cyclobutanols was developed. A series of aromatic- and heteroaromatic-fused 1-tetralones was accessed through ring expansion of the functionalized cyclobutanols via electrochemical generation of alkoxy radicals and intramolecular cyclization.

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