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152668-10-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 152668-10-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,2,6,6 and 8 respectively; the second part has 2 digits, 1 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 152668-10:
135 % 10 = 5
So 152668-10-5 is a valid CAS Registry Number.

152668-10-5Downstream Products

152668-10-5Relevant articles and documents

Intramolecular Nucleophilic Acyl Substitution Reactions of Halo-Substituted Esters and Lactones. New Applications of Organosamarium Reagents

Molander, Gary A.,McKie, Jeffrey A.

, p. 7216 - 7227 (1993)

Intramolecular nucleophilic acyl substitution reactions involving a broad range of halo substituted carboxylic acid derivatives have been accomplished in excellent yield employing samarium(II) iodide as the reductive coupling agent.Although particular substrates cyclized most effectively in THF in the presence of tripiperidinophosphine oxide, carboxylic acid esters, the focus of this report, cyclize equally well without such an additive in the presence of a catalytic quantity of iron(III) complexes.Thus a comprehensive series of halo substituted esters were cyclized in excellent yield to the corresponding 4-, 5-, and 6 -membered carbocycles.The reaction is extremely mild and selective as demonstrated by experiments wherein alkyl chlorides, acetals, and olefins remain completely intact under the reaction conditions.In addition to introducing a convenient procedure for preparing stereodefined spirocyclic systems, a new ring expansion sequence has been developed that appears extremely general for the preparation of various ring systems.

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