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- W2064080254 abstract "The coordinatively unsaturated 12-electron complex dichloro t-butylimido bispyridine titanium(IV) (2a) has been shown to react with CO(2) to give N,N-bis-t-butyl urea. Two analogous sterically hindered coordinatively saturated 14-electron complexes dichloro t-butylimido trispyridine titanium(IV) (10a) and dichloro 2,6-(i-Pr)(2)phenylimido trispyridine titanium(IV) (10b) also gave their corresponding symmetrical ureas upon treatment with CO(2). Further experiments support the intermediary of metallocycles formed from heterocumulene metathesis reactions. The unsymmetrical urea N-benzyl, N-t-butyl urea (11) was produced from treatment of 2,6-(i-Pr)(2)phenylimido trispyridine titanium(IV) (10b) with CO(2) and interception with BnNH(2). Equimolar quantities of N,N-bistrimethylsilybenzylamine or N,N-bistrimethylsilyphenethylamine were shown to promote the reaction between t-butylimido bispyridine titanium(IV) (2a) and CO(2) to give near quantitative yields of symmetrical urea. Other symmetrical ureas could be produced from TiCl(4), amine and CO(2) in moderate to quantitative yields depending on the stoichiometry of amine present." @default.
- W2064080254 created "2016-06-24" @default.
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- W2064080254 date "2012-01-01" @default.
- W2064080254 modified "2023-10-16" @default.
- W2064080254 title "Synthesis of ureas from titanium imido complexes using CO<sub>2</sub>as a C-1 reagent at ambient temperature and pressure" @default.
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- W2064080254 doi "https://doi.org/10.1039/c1ob06576a" @default.
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