in water; acetic acid PPh3 dissolved at 90°C in glacial AcOH, soln. of ammonium perrhenate in concd. HCl added dropwise over 10 min, allowed to stay at 90°C overnight; ppt. filtered off, washed (AcOH and Et2O); elem. anal.;

in hydrogenchloride; acetic acid soln. of (C4H9)4NReO4 in concd. HCl slowly added to soln. of P(C6H5)3 inacetic acid under stirring, dropping funnel rinsed with glacial CH3COOH , mixt. stirred for 5 h; ppt. filtered off, washed with glacial CH3COOH and diethyl ether, dried overnight in vac. desiccator over P2O5;

in water; acetone KReO4 and aq. HCl refluxed for 30 min, aq. NaN3 added, mixt. refluxed for 30 min, soln. of P(C6H5)3 in acetone added, soln. refluxed for 30 min,longer refluxing time leads to oxotrichloro complex; ppt. collected by vac. filtration, washed with warm water, ethanol, and acetone;

in hydrogenchloride; benzene concd. HCl;

in acetonitrile under N2; a mixt. of Re-contg. compd. (1.20 mmol), Si-contg. compd. (1.20 mmol), and PPh3 (2.64 mmol) in MeCN was heated under reflux for 2 h; the soln. was filtered hot; the complex was washed with MeCN and dried under vac.; the filtrate was left to cool and after 24 h a mixt. of greenand orange crystals was formed;

triethylamine in methanol T=25°C; 48 h;

triethylamine in methanol T=25°C; 48 h;