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91138-81-7

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91138-81-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91138-81-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,1,3 and 8 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 91138-81:
(7*9)+(6*1)+(5*1)+(4*3)+(3*8)+(2*8)+(1*1)=127
127 % 10 = 7
So 91138-81-7 is a valid CAS Registry Number.

91138-81-7Downstream Products

91138-81-7Relevant articles and documents

Clarification of the stereochemical course of nucleophilic substitution of arylsulfonate-based nucleophile assisting leaving groups

Braddock, D. Christopher,Pouwer, Rebecca H.,Burton, Jonathan W.,Broadwith, Phillip

experimental part, p. 6042 - 6049 (2009/12/24)

(Chemical Equation Presented) Secondary alcohols modified as tosylates, PEG-sulfonates, or quisylates undergo inversion of configuration at the reacting center when treated with lithium halide in acetone at reflux, where the PEG-sulfonates and quisylates are substantially more reactive. In sterically hindered cases, elimination is a competing process. In contrast, when treated with TiCl4, simple secondary sulfonates give chloride products with partial inversion of configuration. Any observed retention of configuration in a given alkyl sulfonate substrate under these conditions is likely due to neighboring group participation or diastereoselective attack on a carbocation (or ion pair) rather than an SNi mechanism.

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