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Synthesis and reactivity of cyclopentadienyl chloro, imido and alkylidene tungsten (VI) complexes
- Source :
- e_Buah Biblioteca Digital Universidad de Alcalá, instname
- Publication Year :
- 1998
- Publisher :
- Elsevier BV, 1998.
-
Abstract
- This paper describes the synthesis and characterization of alkylidene pentamethylcyclopentadienyl imido tungsten(VI) complexes via α-hydrogen abstraction processes from suitable alkyl derivatives. Reaction of WCp*Cl4 with one equivalent of NH2R (R=tBu, 2,6-Me2–C6H3), two equivalents of NEt3 and subsequent oxidation with PCl5 affords the pentamethylcyclopentadienyl imido tungsten derivatives, WCp*(NtBu)Cl3 2 and WCp*(N-2,6-(Me2)–C6H3)Cl3 4. Alkylation of complexes 2 and 4 with 1.5 equivalents of ZnMe2 under appropriate conditions yields the trimethyl derivatives WCp*(NtBu)Me3 5 and WCp*(N-2,6-(Me2)–C6H3)Me3 6. Exposure of complex 6 to sun-light leads to the formation of WCp*(N-2,6-(Me2)–C6H3)(CH2)Me 7 through a α-hydrogen abstraction process. Analogously, complex 2 reacts with 1.5 equivalents of Mg(CH2Ph)-(thf)2 or three equivalents of LiCH2SiMe3 to give the alkylidene complexes, WCp*(NtBu)(CHPh)(CH2Ph) 8 and WCp*(NtBu)(CHSiMe3)Cl 9, through a spontaneous α-hydrogen abstraction process in these cases.
- Subjects :
- Ciencia
Science
Alkylidene
chemistry.chemical_element
Alkylation
Tungsten
Biochemistry
Medicinal chemistry
Inorganic Chemistry
Cyclopentadienyl complex
CIENCIA
Materials Chemistry
Organic chemistry
Reactivity (chemistry)
Cyclopentadienyl
Physical and Theoretical Chemistry
Alkyl
chemistry.chemical_classification
Imido
Organic Chemistry
SCIENCE
Química inorgánica
chemistry
Chemistry, inorganic
Subjects
Details
- ISSN :
- 0022328X
- Volume :
- 564
- Database :
- OpenAIRE
- Journal :
- Journal of Organometallic Chemistry
- Accession number :
- edsair.doi.dedup.....a99b16b02c865238327c048012f65007