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Reaction of 1,2,2,6,6-penatamethyl-piperidine-4-one (A) with ketone (B) and NH 4 Cl in DMSO at 55 O C for 5 hrs (RXN 1). Multiple trials using different equivalents of ketones and NH 4 Cl, temperatures, and dilutions were attempted.
A series of unnatural amino acids functionalized with sterically shielded pyrroline nitroxides were synthesized. Their reduction by ascorbate/glutathione indicates that L-cysteine functionalized with gem-diethylpyrroline nitroxide is reduced at the slowest rate and is comparable to that measured for the most resistant to reduction pyrroline and pyrrolidine… (More)
In the structure of the title complex salt, (Et2NH2)2[CuCl4], the asymmetric unit consists of four unique di-ethyl-ammonium cations and three unique tetra-chlorido-cuprate anions. Two of the three anions are located with their copper atoms on independent crystallographic twofold axes, while the remaining tetra-chlorido-cuprate is located at a general… (More)