6181-09-5Relevant academic research and scientific papers
Synthesis and molecular structure of phenyl and tolylgermatranes
Lukevics, Edmunds,Ignatovich, Luba,Belyakov, Sergey
, p. 222 - 230 (1999)
The crystals of arylgermatranes (R=H (I), 4-CH3 (II), 3-CH3 (III), 2-CH3 (IV)), have been obtained to study the influence of a substituent position on coordination of the germanium atom. Compounds I-IV were prepared by the insertion of GeBr2 into the carbon-bromine bond of the corresponding arylbromide, conversion of aryltribromogermanes to triethoxy derivatives by alcoholysis and their transalkoxylation with triethanolamine to germatranes; or by the condensation of halobenzene with GeCl4 in the presence of copper powder followed by alcoholysis and cyclization. The crystal structure of compounds I-IV was studied via the X-ray diffraction method. The intramolecular donor-acceptor bond Ge←N in arylgermatranes (2.212-2.230 A) is longer than that in the corresponding furyl- and thienylgermatranes. Introduction of a substituent into o-position of the benzene ring decreases the N-Ge-C angle value from 177.5 to 144.2°. The quantum chemical calculations were performed to investigate structures I-IV in isolated molecules.
