The chemical compound "3,9-Bis-(3-methyl-4-methylmercapto-phenoxy)-2,4,8,10-tetraoxa-3,9-diphospha-spiro<5.5>undecan-3,9-disulf" is a complex organophosphorus compound with a unique structure. It features a spiro[5.5]undecane core, which is a cyclic structure with five carbon atoms in one ring and six in the other, connected at a single point. The compound is characterized by two phosphorus atoms that are part of the spiro framework, and it contains disulfide bridges, which are sulfur-sulfur bonds that can be important for the compound's reactivity and stability. The phenoxy groups are substituted with methyl and methylmercapto groups, which contribute to the compound's overall chemical properties. 3,9-Bis-(3-methyl-4-methylmercapto-phenoxy)-2,4,8,10-tetraoxa-3,9-diphospha-spiro<5.5>undecan-3,9-disulf is likely to be of interest in the fields of organophosphorus chemistry and materials science, potentially for its applications in areas such as catalysis or as a structural component in advanced materials.
The CAS Registry Mumber 5601-18-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,6,0 and 1 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 5601-18: (6*5)+(5*6)+(4*0)+(3*1)+(2*1)+(1*8)=73 73 % 10 = 3 So 5601-18-3 is a valid CAS Registry Number.