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344563-43-5

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344563-43-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 344563-43-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,4,5,6 and 3 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 344563-43:
(8*3)+(7*4)+(6*4)+(5*5)+(4*6)+(3*3)+(2*4)+(1*3)=145
145 % 10 = 5
So 344563-43-5 is a valid CAS Registry Number.

344563-43-5Upstream product

344563-43-5Relevant articles and documents

Buparvaquone preparation method

-

, (2020/02/10)

The invention provides a buparvaquone preparation method, which comprises: carrying out condensation, hydrolysis and decarboxylation by using o-phthalic acid diester and 2-(4-tert-butylcyclohexylmethyl)succinic acid diester as a raw material to prepare 2-[(4-tert-butylcyclohexyl)methyl]-2,3-dihydro-1,4-naphthalenedione, carrying out a substitution reaction on the 2-[(4-tert-butylcyclohexyl)methyl]-2,3-dihydro-1,4-naphthalenedione and a halogenating reagent to obtain a dihalogenated compound mixture, removing halogen hydride through an elimination reaction to obtain 2-[(4-tert-butylcyclohexyl)methyl]-3-halo-1,4-naphthalenedione, and finally carrying out a hydrolysis reaction to obtain the buparvaquone (I). According to the invention, the method has advantages of cheap and easily available raw materials, safe and simple process operation, low cost, little wastewater generation, safety and environmental protection, easily achieved reaction conditions, stable reaction intermediate, high reaction activity, high selectivity and few side reactions, and the prepared buparvaquone is few in impurity and high in purity and yield.

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