128639-89-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 128639-89-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,6,3 and 9 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 128639-89:
(8*1)+(7*2)+(6*8)+(5*6)+(4*3)+(3*9)+(2*8)+(1*9)=164
164 % 10 = 4
So 128639-89-4 is a valid CAS Registry Number.
128639-89-4Relevant academic research and scientific papers
DIELS-ALDER CYCLOADDITION REACTIONS OF ENAMINOTHIONS WITH NITROALKENES
Baruah, P. D.,Mukherjee, S.,Mahajan, M. P.
, p. 1951 - 1962 (2007/10/02)
Diels-Alder cycloaddition reactions of enaminothiones (1) with nitroalkenes (2) result in very good yields (78-90percent) of (2R,3S,4R)-6-aryl-2-aryl/furyl-3,4-dihydro-4-dimethylamino-3-nitro-2H-thiopyrans (3) as exclusive stereoisomers.The reactions of 3
