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82787-99-3

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82787-99-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 82787-99-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,7,8 and 7 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 82787-99:
(7*8)+(6*2)+(5*7)+(4*8)+(3*7)+(2*9)+(1*9)=183
183 % 10 = 3
So 82787-99-3 is a valid CAS Registry Number.

82787-99-3Relevant articles and documents

REACTION OF BENZOTHIOPHENE-5- AND 6-METHANOLS WITH n-BUTYLLITHIUM. DIRECTED LITHIATION IN THE BENZENE RING

Cross, Peter E.,Dickinson, Roger P.

, p. 2391 - 2400 (2007/10/02)

The preparation of 3-methylbenzothiophene-6-methanol (3) is described.Treatment of 3 with n-butyllithium followed by CO2 gave, in addition to the expected 2-carboxylic acid 2, a substantial quantity of the lactone 11 formed via lithiation at the 7-position.It was concluded that lithiation at 7-position is favoured by a co-operative effect of the anion of the alcohol and the ring sulphur atom, as well as the 3-methyl group which reduces the rate of lithiation at the 2-position.In the case of compounds in which the alcohol group is at the 5-position or which lack the 3-methyl group, lithiation in the benzene ring was much less favoured .

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