Rust) 160 (calc. 165.2); Amax= 247mp (log€ = 3.89);222mp (log E = 4.38) [3]) is obtained in 79 % yield.
Chromium and Tungsten Carbene Complexes of Thieno[3,2-b]thiophene
✍ Scribed by Marilé Landman; Helmar Görls; Simon Lotz
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 308 KB
- Volume
- 2001
- Category
- Article
- ISSN
- 1434-1948
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Treatment of (CO) 5 W=C(NMe 2 )CH=CH-Ar-(OH)(H)CϵCH (1a-b) [a: -Ar-=1,4-C 6 H 4 -; b: -Ar-= 2,5-C 4 H 2 S-] with W(CO) 5 (THF) in methanol yields the nonsymmetrical bis(alkenylcarbene)-bridged ditungsten complexes (CO) 5 W= C(NMe 2 )CH=CH-Ar-CH=CH(OMe)C=W(CO) 5 (3a-b). Similarly, the symmetrical bis
the line-shape changes allow the detection of two different dynamic processes, which may be assigned to inhibited rotations about the partial C C and C N double bonds of the E-isomers (Scheme 2). Above ca. 0°C conversion into the isomer with Z-configurated CC double bond, which contains an intramol