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1237539-05-7

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1237539-05-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1237539-05-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,3,7,5,3 and 9 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1237539-05:
(9*1)+(8*2)+(7*3)+(6*7)+(5*5)+(4*3)+(3*9)+(2*0)+(1*5)=157
157 % 10 = 7
So 1237539-05-7 is a valid CAS Registry Number.

1237539-05-7Downstream Products

1237539-05-7Relevant articles and documents

Direct access to upper rim substituted mono- and diaryloxy calix[4]arenes via bis(spirodienone) route

Thulasi, Sreeja,Babu, Jisha,Babukuttannair, Adarsh,Sreemathi, Viji,Varma, Ramavarma Luxmi

, p. 5270 - 5276 (2010)

A seemingly ipso-like nucleophilic substitution of the upper rim of p-tert-butylcalix[4]arene is accomplished by an indirect method involving calixF4larene derived bis(spirodienone). This method not only provides both mono and 1,3-diaryloxy calixarenes but also enables the synthesis of upper rim monothio substituted calix[4]arenes. A modification of the methodology can be successfully extended for the selective synthesis of mono- and 1,3-diquinone calyx[4]arenes having free hydroxyl groups at the lower rim, in fewer steps.

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