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109988-98-9

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109988-98-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 109988-98-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,9,8 and 8 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 109988-98:
(8*1)+(7*0)+(6*9)+(5*9)+(4*8)+(3*8)+(2*9)+(1*8)=189
189 % 10 = 9
So 109988-98-9 is a valid CAS Registry Number.

109988-98-9Relevant articles and documents

HYDROLYSE ACIDO-CATALYSEE D'UN SULFURE DE DIENYLE APPLICATION A LA SYNTHESE DE LA gamma-DAMSCONE

Gosselin, Pascal

, p. 1979 - 1990 (2007/10/02)

A new synthetic route to γ-Damascone 1 starting with methyl-γ-dithiocyclogeranate 2 is described.Addition of HMPT was found necessary to perform the carbophilic addition of allylmagnesium bromide on dithioester 2.A dienylsulfide, 6,6-dimethyl-2-methylene-(1-methylthio-1,3-butadiene)-1-yl cyclohexane 3 resulted from this addition, and not the expected dithioketal.Following a number of described conditions, hydrolysis of 3 to γ-damascone 1 proved to be unsatisfactory.These initial attempts but showed the necessity for an acidic medium.This finding allowed the development of a new, very mild method of hydrolysis of dienylsulfides to unsaturated ketones.

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