642-81-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642-81-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,4 and 2 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 642-81:
(5*6)+(4*4)+(3*2)+(2*8)+(1*1)=69
69 % 10 = 9
So 642-81-9 is a valid CAS Registry Number.
InChI:InChI=1/C15H23NO4/c1-8-3-9(2)15(20)11(4-8)12(17)5-10-6-13(18)16-14(19)7-10/h8-12,17H,3-7H2,1-2H3,(H,16,18,19)/t8-,9-,11+,12+/m0/s1
642-81-9Relevant academic research and scientific papers
KINETICALLY AND THERMODYNAMICALLY CONTROLLED SYNTHESIS OF 2,6-DISUBSTITUTED CYCLOHEXANONE SEMICARBAZONES. A MOLECULAR MECHANICS STUDY OF A1,3-STRAIN
Castello, Assumpta,Jaime, Carlos,Marquet, Jorge,Moreno-Manas, Marcial
, p. 3791 - 3802 (2007/10/02)
Reasonable values for Me-Me, H-Me and Me-H A1,3-strain have been evaluated by molecular mechanics calculations on differently substituted methylenecyclohexanes (5.46-6.75, 1.03 and 0.71 kcal/mol, respectively).The chair-to-chair inversion barri