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42723-49-9

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42723-49-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 42723-49-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,7,2 and 3 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 42723-49:
(7*4)+(6*2)+(5*7)+(4*2)+(3*3)+(2*4)+(1*9)=109
109 % 10 = 9
So 42723-49-9 is a valid CAS Registry Number.

42723-49-9Relevant articles and documents

Direct Formation of the Steroid Nucleus by a Biomimetic Cyclization

Johnson, William S.,McCarry, Brian E.,Markezich, R. L.,Boots, Sharon G.

, p. 352 - 359 (2007/10/02)

The aim of this study was to synthesize the trienynol 3 and to study its cyclization.The substrate was synthesized by a convergent route, the key step being the stereoselective Wittig-Schlosser condensation of the known aldehyde 19 with the phosphorane 18

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