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111258-54-9

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111258-54-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 111258-54-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,2,5 and 8 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 111258-54:
(8*1)+(7*1)+(6*1)+(5*2)+(4*5)+(3*8)+(2*5)+(1*4)=89
89 % 10 = 9
So 111258-54-9 is a valid CAS Registry Number.

111258-54-9Relevant articles and documents

Keto ethers. IV. Products formed on reaction of dihydro-2,2,5,5-tetramethyl-3(2H)-furanone with strong acids

Yates, Peter,Burke, Patrick Michael

, p. 1695 - 1704 (2007/10/02)

Reaction of tetrahydro-2,2,5,5-tetramethyl-3(2H)-furanone (1) with 96 or ca. 100percent sulfuric acid or hot polyphosphoric acid followed by aqueous quenching gave the following products: 2-hydroxy-2,5-dimethyl-4-hexen-3-one (3), 2,4,4-trimethyl-2-cyclopenten-1-one (7), 3,5,5-trimethyl-2-cyclopenten-1-one (8), tetrahydro-2,3,5,5-tetramethylfuran-2,3-diol (11), 2,5-dihydro-3,5,5-trimethyl-2-methylenefuran (17) and its dimer 20, 2,5-dihydro-2,3,5,5-tetramethyl-2-furanol (18), 4-hydroxy-2,4-dimethyl-2-pentenoic acid γ-lactone (22), 2,3,5-trimethyl-2-cyclopenten-1-one (23), and tetramethylfuran (25).In 96percent sulfuric acid the products arise by ring opening, ring opening followed by reclosure to carbocyclic products, methyl migration from C-2 to C-3 to give rearranged furan derivatives, and oxidation.In ca. 100percent sulfuric acid or hot polyphosphoric acid further methyl migrations can occur to give 23 and 25.

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