503540-53-2Relevant articles and documents
Synthesis, characterization and crystal structure of a phenol-functionalized diazamesocyclic derivative with unexpected configuration
Guo, Ya-Mei,Du, Miao,Bu, Xian-He
, p. 191 - 196 (2003)
A bis-substituent diazamesocyclic compound containing bulky phenolic donor pendants, 1,4-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-1,4-diazacycloheptane, has been prepared from 1,4-diazacycloheptane (DACH) and 2-tert-butyl-4-methylphenol by the Mannich reaction, and structurally characterized by NMR, IR and X-ray diffraction techniques. The crystal structure of the title compound reveals that 1,4-diazacycloheptane (DACH) ring is folded up into unusual chair configuration, and the two phenol pendants of the compound are in unexpected trans positions, which is different from those in the transition metal complexes of DACH and its derivatives. There exist intra-molecular O-H···N hydrogen bonds between the phenolic O atoms and the DACH N donors which stabilize the crystal structure.
Homopiperazine and piperazine complexes of ZrIV and Hf IV and their application to the ring-opening polymerisation of lactide
Hancock, Stuart L.,Mahon, Mary F.,Kociok-Kohn, Gabriele,Jones, Matthew D.
experimental part, p. 4596 - 4602 (2011/12/01)
In this paper we describe the preparation and characterisation, by single-crystal X-ray diffraction, of twelve ZrIV/HfIV complexes based on piperazine or homopiperazine salan ligands. With the piperazine ligands, a mixture of species
