Chlorotrioxorhenium. Neue Synthesen, Reaktionen und Derivate

Abstract

lb-e) are generated from R e 2 0 t and either ZnX2, (noxides in good yields. These synthetic routes have the advan-C4H9)3SnX, [(n-C,H&N]X, or [ (CAHS)4P]X in clean reactions. tage to proceed under very mild conditions. The adducts of Compounds la-f form with stable six-coordinate adducts 2,2'-bipyridine with halorhenium(VI1) oxides show characte-XRe03.L (2a-f, 3a, 4a, 5a: L = N,N'-ligand) upon addition ristic thermogravimetric (TG) behavior that reflects the volaof the free ligand L, e.g. 2,2'-bipyridine. l a is readily alky-tility of the uncoordinated complexes X-Re03. CI

Oxorhenium Complexes as Aldehyde‐Olefination Catalysts

“…All compounds were purchased from Aldrich unless stated otherwise. The ligand p ‐tolyl‐DAB,20 compounds 1 – 3 ,13 4 ,21 5 ,22 7 − 9 ,23 10 ,13 [ReOCl 3 (PPh 3 ) 2], 24 [ReOCl 3 (dppe)],25 13, 26 14, 27 15, 25 16, 28 17, 25 18, 27 and 19 27 were synthesized according to published procedures. Complexes 13 – 19 were a kind offer from Dr. Isabel Santos and Dr. António Paulo from the Instituto de Tecnologia Nuclear, Sacavém, Portugal.…”

Organorhenium Oxides

“…Both compounds are easily and quantitatively available from Re 2 O 7 and can be used in situ for the reaction with the organylating reagents without rhenium loss (eqs 4 and 5). 9,10 Covalent perrhenates such as Me 3 SiOReO 3 and Me 3 SnOReO 3 are also suitable precursor compounds of R-ReO 3 complexes. 11 It has been shown that organozinc precursors are useful for the preparation of long-chain alkylrhenium oxides (2-14) 12 and σ-arylrhenium oxides (25-33) 13 while methyl-(1), alkenyl-(15-18, 22-24), and alkynyl-(19-21) rhenium(VII) oxides and nonperalkylated cyclopentadienylrhenium(VII) oxides (35,36) are available with organotin precursors.…”

Insights into a Nontoxic and High‐Yielding Synthesis of Methyltrioxorhenium (MTO)

“…After removal of the solvent, pure MTO can easily be obtained by recrystallization or sublimation. The employed rhenium precursors gave generally good yields ranging from 66–92 % and are, by far, superior to dirhenium heptoxide ( 5 ), chloro trioxorhenium22 ( 6 ) or trimethylsilyl perrhenate23 ( 7 ) as more reactive rhenium sources (Table 2). The best results were obtained with acetic and isobutyric acid derivatives.…”