138742-89-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138742-89-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,4 and 2 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 138742-89:
(8*1)+(7*3)+(6*8)+(5*7)+(4*4)+(3*2)+(2*8)+(1*9)=159
159 % 10 = 9
So 138742-89-9 is a valid CAS Registry Number.
138742-89-9Relevant articles and documents
Synthesis of 17-(isocyanotosylmethylene) steroids: precursors to pregnane derivatives
Leusen, Daan van,Leusen, Albert M. van
, p. 393 - 401 (2007/10/02)
The synthesis is described of a series of twenty 17-(isocyanotosylmethylene) steroids 5 from 17-oxo steroids and 4-tolylsulfonylmethyl isocyanide (TosMIC).Furthermore, nine analogous 17-(isocyanosulfonylmethylene) steroids (15-21a) have been prepared usin
