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81236-33-1

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81236-33-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81236-33-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,2,3 and 6 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81236-33:
(7*8)+(6*1)+(5*2)+(4*3)+(3*6)+(2*3)+(1*3)=111
111 % 10 = 1
So 81236-33-1 is a valid CAS Registry Number.

81236-33-1Relevant articles and documents

SYNTHESIS OF CARBOXYLIC ESTERS USING FORMALDEHYDE DIMETHYL DITHIOACETAL S,S-DIOXIDE

Ogura, Katsuyuki,Watanabe, Jun-ichi,Iida, Hirotada

, p. 4499 - 4502 (1981)

Formaldehyde dimethyl dithioacetal S,S-dioxide (1) reacted with an alkyl bromide or a 2-alkenyl bromide (8) under phase-transfer conditions using 50percent aq.NaOH to give an alkyl or 2-alkenyl derivative of 1, whereas, in the reaction with 8 in the presence of K2CO3-KI in HMPA, 1 formed a 1-alken-3-yl derivative.Transformation of these products into the corresponding carboxylic esters was also described.

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