In recent years, polyureas with dynamic hindered urea bonds (HUBs), a class of promising biomedical polymers, have attracted wide attention as a result of their controlled hydrolytic properties. The effect of the chemical structures on the properties of polyureas and
The lithiation of N,N'-di-tert-butylethylenediamine by MeLi in benzene has been shown by (1)H NMR spectroscopy to proceed via the partially lithiated species [cis-{Li[&mgr;-N(t-Bu)CH(2)CH(2)N(H)t-Bu]}(2)], 2, and [{Li[N(t-Bu)CH(2)CH(2)N(H)t-Bu]}(2)Li{N(t-Bu)CH(2)CH(2)Nt-Bu}Li], 3, prior to the formation of the dilithiated species {Li[N(t-Bu)CH(2)CH(2)Nt-Bu]Li}, 4. The solid state
New chemistry from the reaction of N, N'-disubstituted ethylenediamines with glyoxal: synthesis of 2-imidazolidinecarboxaldehydes and 1, 4, 6, 9-tetraalkyl-1, 4, 6, 9-tetraaza-5, 10-dioxaperhydroanthracenes.
Willer RL, et al.
The Journal of Organic Chemistry, 50(13), 2368-2372 (1985)
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