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133752-75-7

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133752-75-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133752-75-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,7,5 and 2 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 133752-75:
(8*1)+(7*3)+(6*3)+(5*7)+(4*5)+(3*2)+(2*7)+(1*5)=127
127 % 10 = 7
So 133752-75-7 is a valid CAS Registry Number.

133752-75-7Downstream Products

133752-75-7Relevant articles and documents

Crown Ethers from o-Quinone Diazides and Oxetane

Kirmse, Wolfgang,Lelgemann, Rudolf

, p. 1865 - 1866 (2007/10/02)

The carbenes 11, generated by photolysis of the di- and tetrachloro-o-quinone diazides 10, react with oxetane in a 1:3 ratio to give the 15-membered crown ethers 19.In the presence of methanol, the oxonium ions 12 are trapped with formation of 1-(aryloxy)-3-methoxypropanes (13).In the absence of additional nucleophiles, 12 react with oxetane until the chain length is appropriate for inverting intramolecular attack of the aryl oxide at the α-carbon atom of the oxonium ion (18 -> 19). Key Words: Carbonyl carbenes/ Oxygen ylides/ Displacement, nucleophilic, intramolecular/ Carbenes/ Ylides

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