ISSN:
1572-8862
Keywords:
Tungsten
;
triple bond
;
alkoxide
;
amide
;
β-diketonate
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The reactions between 1,2-W2 R 2(NMe2)4 (R=Et and Ph) and 1,2-W2 R 2(OPr i )4 (R=CH2Ph and Bu t ) and Bu t -CHCOCH2COBu t (Bu t -acacH) (4 equiv)in pentane or hexane give, respectively, W2 R 2NMe2)2 (Bu t -acac)2 and W2 R 2(OPr i )2 (Bu t -acac)2 that are remarkably thermally and photochemically robust with respect to further reaction and reductive elimination to give the targeted compounds W2(Bu t -acac)4. The new compounds have been characterized by elemental analysis, infrared, and1H NMR spectroscopy and forR = Et and CH2Ph by single crystal X-ray studies. In each compound there are four coordinate W atoms united by unbridged W-W triple bonds. Crystal data for W2Et2(NMe2)2 (Bu t -acac)2 at −165°C:a=17.115(2) Å,b=10.542(1) Å,c = 19.786(3) Å.β = 98.55(1)°,Z = 4, and space group C2/c; for W2(CH2Ph)2 (OPr i )2 (Bu t -acac)2 at −157°C:a=23.547(5) Å,b = 10.784(2)Å,c = 21.105(5) Å,β = 127.20(1)°,Z = 4, and space group C2/c.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01165492
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