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28049-00-5

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28049-00-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28049-00-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,0,4 and 9 respectively; the second part has 2 digits, 0 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 28049-00:
(7*2)+(6*8)+(5*0)+(4*4)+(3*9)+(2*0)+(1*0)=105
105 % 10 = 5
So 28049-00-5 is a valid CAS Registry Number.

28049-00-5Downstream Products

28049-00-5Relevant articles and documents

Fluorous biphasic esterification directed towards ultimate atom efficiency

Xiang, Jiannan,Orita, Akihiro,Otera, Junzo

, p. 4117 - 4119 (2002)

Aperfectly selective esterification that discriminates between primary and sterically hindered or aromatic carboxylic acids occurs in the presence of the fluoroalkyldistannoxane [{Cl(C6F13CH2 CH2)2SnOSn(CH2CH2 -C6F13)2Cl}2] (1). The reaction gives 100% yield with a strict 1:1 ratio of the carboxylic acid and alcohol reactants, and the catalyst can be recycled without any loss of activity.

A practical and green chemical process: Fluoroalkyldistannoxane-catalyzed biphasic transesterification

Xiang, Jiannan,Toyoshima, Shinji,Orita, Akihiro,Otera, Junzo

, p. 3670 - 3672 (2007/10/03)

There is no need for the recovery of the catalyst in the fluorous biphasic transesterification catalyzed by [{Cl(C6F13CH2CH2)2 SnOSn(C6F13CH2CH2) 2Cl}2] (1; see scheme), which results in quantitative conversions and yields. An FC-72 solution of the dimeric flouroalkyldistannoxane 1 can be recycled repeatedly without having to recover the neat catalyst.

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