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97759-70-1

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97759-70-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 97759-70-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,7,5 and 9 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 97759-70:
(7*9)+(6*7)+(5*7)+(4*5)+(3*9)+(2*7)+(1*0)=201
201 % 10 = 1
So 97759-70-1 is a valid CAS Registry Number.

97759-70-1Downstream Products

97759-70-1Relevant articles and documents

SYNTHESES OF β-LACTAMS BY RING CONTRACTION OF ISOTHIAZOLIDINONES

Easton, Christopher J.

, p. 153 - 158 (2007/10/02)

Several methods have been developed for the preparation of β-lactams from isothiazolidinones.Oxidation of 2-t-butyl-4,4-diphenyl- and 2,4,4-trimethyl-isothiazolidin-3-ones (4a) and (4b) with sulphuryl chloride afforded the 5-chloroisothiazolidinones (5a) and (5b), which were converted into 1-t-butyl-3,3-diphenyl- nd 1,3,3-trimethyl-4-phenylthioazetidin-2-ones (6a) and (6b) by treatment with phenyl-lithium.Alternatively, reaction of the isothiazolidinones (4a) and (4b) with phenyl-lithium gave N-t-butyl-2,2-diphenyl- and N,2,2-trimethyl-3-phenylthiopropionamides(12a) and (12b), which were transformed into the β-lactams (6a) and (6b) by halogenation at C-3, followed by treatment with potassium amide.These are examples of methods used to prepare β-lactams from isothiazolidinones.The verstility of these reactions and their relevance to penicilin biosynthesis is discussed.

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