133475-87-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 133475-87-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,4,7 and 5 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 133475-87:
(8*1)+(7*3)+(6*3)+(5*4)+(4*7)+(3*5)+(2*8)+(1*7)=133
133 % 10 = 3
So 133475-87-3 is a valid CAS Registry Number.
133475-87-3Relevant articles and documents
Dimethyl isopropylidene malonate, the 'forgotten' dienophile
Chapuis
, p. 355 - 358 (1991)
Despite the reported unreactivity of dimethyl isopropylidene malonate 1a as a Diels-Alder dienophile, moderate yields of cycloadducts are obtained with various dienes in refluxing CHCl3 in the presence of catalytic amounts of AlCl3.
