438631-40-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 438631-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,8,6,3 and 1 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 438631-40:
(8*4)+(7*3)+(6*8)+(5*6)+(4*3)+(3*1)+(2*4)+(1*0)=154
154 % 10 = 4
So 438631-40-4 is a valid CAS Registry Number.
438631-40-4Relevant academic research and scientific papers
A novel spiroketalization reaction of 1,7-dihydroxyhepta-2,5-diyn-4-ones
Tanaka, Koichi,Harada, Naoyuki
, p. 713 - 714 (2007/10/03)
Symmetrical halogented spiroketals were synthesized by the reaction of optically active 1,7 dihydroxyhepta-2,5-diyn-4-ones with hydrogen halide in AcOH. Spiroketals in yields of 62-97% was obtained by the dihydroxydiynones. The optical purity was determin
