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73453-45-9

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73453-45-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 73453-45-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,4,5 and 3 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 73453-45:
(7*7)+(6*3)+(5*4)+(4*5)+(3*3)+(2*4)+(1*5)=129
129 % 10 = 9
So 73453-45-9 is a valid CAS Registry Number.

73453-45-9Downstream Products

73453-45-9Relevant articles and documents

Reactions of Acetoacetic Ester Blocked Cyclohexyl Isocyanate

Wicks, Zeno W.,Wu, Kuang-Jong

, p. 2446 - 2448 (1980)

Acetoacetic ester has been widely reported to be a blocking agent for isocyanates.However, we find that only a trace of isocyanate is formed by thermolysis of acetoacetic ester blocked cyclohexyl isocyanate, 1, at 150 deg C and atmospheric pressure.The major portion is unchanged even after 8 h, with some conversion to acetylmalonic ester, 2, and acetyl-N,N'-dicyclohexylmalonamide, 3.Alcoholysis does not yield the "normal" urethane as blocked isocyanates do but rather esters of 1 with some diesters of 2 and smaller amounts of 3.Significant amounts of N-cyclohexylacetamide, N-cyclohexylmalonamate ester, and some N,N'-dicyclohexylmalonamide are also obtained.Aminolysis leads to N-substituted acetamides and N-cyclohexylmalonamate but no substituted ureas, the "normal" products for aminolysis of blocked isocyanates.In the presence of acid catalysts, alcoholysis leads to N-cyclohexylmalonamates with acetate esters as the other product.

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