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71653-45-7

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71653-45-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 71653-45-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,6,5 and 3 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 71653-45:
(7*7)+(6*1)+(5*6)+(4*5)+(3*3)+(2*4)+(1*5)=127
127 % 10 = 7
So 71653-45-7 is a valid CAS Registry Number.

71653-45-7Relevant articles and documents

From ketones to esters by a Cu-catalyzed highly selective C(CO)-C(alkyl) bond cleavage: Aerobic oxidation and oxygenation with air

Huang, Xiaoqiang,Li, Xinyao,Zou, Miancheng,Song, Song,Tang, Conghui,Yuan, Yizhi,Jiao, Ning

supporting information, p. 14858 - 14865 (2014/12/11)

The Cu-catalyzed aerobic oxidative esterification of simple ketones via C-C bond cleavage has been developed. Varieties of common ketones, even inactive aryl long-chain alkyl ketones, are selectively converted into esters. The reaction tolerates a wide range of alcohols, including primary and secondary alcohols, chiral alcohols with retention of the configuration, electron-deficient phenols, as well as various natural alcohols. The usage of inexpensive copper catalyst, broad substrate scope, and neutral and open air conditions make this protocol very practical. 18O labeling experiments reveal that oxygenation occurs during this transformation. Preliminary mechanism studies indicate that two novel pathways are mainly involved in this process. (Chemical Equation Presented)

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