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1783-46-6

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1783-46-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1783-46-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,7,8 and 3 respectively; the second part has 2 digits, 4 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1783-46:
(6*1)+(5*7)+(4*8)+(3*3)+(2*4)+(1*6)=96
96 % 10 = 6
So 1783-46-6 is a valid CAS Registry Number.

1783-46-6Downstream Products

1783-46-6Relevant articles and documents

Carbonylation of Amines by Carbon Dioxide in the Presence of an Organoantimony Catalyst

Nomura, Ryoki,Hasegawa, Yasuhiro,Ishimoto, Mikio,Toyosaki, Takayuki,Matsuda, Haruo

, p. 7339 - 7342 (1992)

1,3-Dialkylureas (RNHCONHR; where R = Bu, i-Bu, s-Bu, t-Bu, allyl, Ph) and tetramethylurea were successfully prepared at 80 deg C under an initial CO2 pressure of 4.9 MPa, from the corresponding amines and carbon dioxide with catalysis by triphenylstibine oxide and assistance from tetraphosphorus decasulfide (Ph3SbO/P4S10).Monitoring of the reaction by 13C NMR revealed that the successive thiolation of carbamic acid to an intermediate antimony carbamate species and aminolysis of the carbamothioic acid thus formed constitute the reaction course.Cyclic ureas can also be synthesized by similar carbonylations of diamines (RNHCH2CH2NHR'; where R, R' = H, H; Me, H; Ph, H; HOCH2CH2, H; HOCHMeCH2, H; Me, Me).Furthermore, the Ph3SbO/P4S10 catalyst system enabled the preparation of trisubstituted ureas such as 1-butyl-3,3-diethylurea by a selective cocarbonylation of butylamine and diethylamine.

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