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Multiple Bonds Between Main‐Group Elements and Transition Metals, CLXIV. Alkylrhenium(VI) Oxides‐Synthesis and Characterization
Author(s) -
Kiihn Fritz E.,
Herrmann Wolfgang A.,
Minkb Janos
Publication year - 1997
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19971300225
Subject(s) - chemistry , raman spectroscopy , transition metal , characterization (materials science) , metal , medicinal chemistry , stereochemistry , organic chemistry , nanotechnology , catalysis , physics , optics , materials science
Most alkylrhenium(VII) oxides, e.g. (( cyclo )‐C 3 H 5 )Re0 3 ( 2 ) are rather sensitive to temperature and moisture with the prominent exception of methyltrioxorhenium ( 1 ). The corresponding alkylrhenium(VI) oxides of formula [RR′(O)‐ Re( μ ‐O)] 2 [RR′( cyclo )‐C 3 H 5 ( 3 ), i Pr ( 4 ); RCH 3 , R′C 2 H 5 ( 5 ), RCH 3 , R′ i Pr ( 6 )] are much more stable in this regard. They can be handled in air at room temperature. They were synthesized from Re 2 0 7 and dialkylzinc precursors, fully characterized and are available in much higher yields than their Re VII congeners. Mixed tetraalkyltetraoxodirhenium(VI) complexes (R # R′) synthesized from 1 and dialkylzinc compounds form as a mixture of cis / trans isomers. They are oily liquids at room temperature. The ReO and Re‐Re stretching force constants as a measure of the bond strengths, were determined from IR and Raman data.