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99221-27-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99221-27-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,2,2 and 1 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 99221-27:
149 % 10 = 9
So 99221-27-9 is a valid CAS Registry Number.

99221-27-9Relevant articles and documents

Synthesis of 4-Benzoyl-4-methylcyclohexa-2,5-dienone and its Benzoyl Substitued Derivatives: Isolated 4-Acylcyclohexa-2,5-dienones

Jackson, Lorraine B.,Waring, Anthony J.

, p. 1791 - 1798 (2007/10/02)

The synthesis are reported of 4-benzoyl-4-methylcyclohexa-2,5-dienone, and its 4-(4-chlorobenzoyl) and 4-(4-methoxybenzoyl) analogues.These are the first isolated 4-acylcyclohexa-2,5-dienones containing the dienone function in a monocyclic ring system.All are sensitive to nucleophilic attack at the benzoyl carbonyl group, being cleaved to 4-methylphenol and its derivatives of the appropriate substitued benzoic acid.Treatment with acids failed to give the desired dienone-phenol rearrangement, with a benzoyl migration from C-4 to C-3, but instead gave 4-methylphenyl benzoate or its derivatives, by a reversal of a Fries rearrangement with C-4 to O-aroyl migration.

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