Abstract
Reactions between R13Al and R2NH·CO·R3(R1= Me or Et; R2= Me, Et, But, or Ph; R3= Me or Ph) leading to materials (R12Al·NR2·CO·R3)n are described. I.r., mass, and 1H n.m.r. spectroscopic details of the products are given. Cyclic 8-membered ring structures (n= 2) are proposed for these compounds in the solution phase. Cryoscopic studies support dimeric structures for the compounds (Me2Al·NPh·CO·Me)2 and (Me2Al·NBut·CO·Me)2 in benzene, although an X-ray crystallographic study of the former, which can also be prepared from Me3Al and PhNCO, shows a trimeric structure to be more likely in the crystal. The related sulphur compound Me2Al·NPh·CS·Me, from Me3Al and PhNCS, probably also has a similar cyclic structure in solution.
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