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444901-21-7

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444901-21-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 444901-21-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,4,9,0 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 444901-21:
(8*4)+(7*4)+(6*4)+(5*9)+(4*0)+(3*1)+(2*2)+(1*1)=137
137 % 10 = 7
So 444901-21-7 is a valid CAS Registry Number.

444901-21-7Relevant articles and documents

BENZIMIDAZOLIDINONE DERIVATIVES

-

Page/Page column 19, (2010/02/07)

The present invention can provide novel compounds useful as orally administrable growth hormone releaser, more specifically a benzimidazolidinone derivative of formula (1) or a pharmaceutically acceptable salt thereof:(1) wherein R1 is optional

Kinetics and mechanism of the aminolysis of ethyl aryl carbonates in acetonitrile

Koh, Han Joong,Lee, Ji-Won,Lee, Hai Whang,Lee, Ikchoon

, p. 710 - 716 (2007/10/03)

The aminolysis reactions of ethyl aryl carbonates with benzylamines in acetonitrile at 25.0°C are investigated. The base-catalyzed path, k2, disappears when strong nucleophiles (X = p-CH3O and p-CH3) react with a substrate activated by a strong nucleofuge (Z = p-NO2). The large magnitude of ρ(x) (-1.7 to -2.5), ρ(z) (3.4 to 4.3), and ρ(xz) (1.4) values, and relatively large k(H)/k(D) (1.6 to 1.8) found for the uncatalyzed path (k1) can be accounted for in terms of a stepwise mechanism with rate-limiting expulsion of the phenoxide leaving group. The catalyzed process (k2) is characterized by the much smaller magnitude of ρ(x) (-1.0 to -1.7), ρ(z) (0.4 to 0.7), and ρ(xz) (0.2), the larger k(H)/k(D) (2.1 to 2.5) values, and the lower ΔH(+) values (1.8-1.9 kcal mol-1) than those of the uncatalyzed process (k1) with large negative ΔS(+) values (-65 to -67 cal K-1 mol- 1). These results are consistent with four- and six-centered transition states for the two processes, k1 and k2, respectively.

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