Substitutionsprodukte des Cyclopentadiens, 9. Mitt.: Phenylcyclopentadien

Riemschneider, R.; Nerin, R.

doi:10.1007/bf00929554

Cited by 24 publications

(22 citation statements)

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“…Synthesis of l-aryl-3-methylsubstituted cyclopentadienes (la,b) 3-Methyl-l-phenylcyclopentadiene (la) was prepared by a modification of a procedure described in the literature [11], avoiding acidic conditions during work-up. Reaction of phenyllithium with 3-methyl-2-cyclopentene-l-one and thermal dehydration of the alcohol essentially as described for the synthesis of phenylcyclopentadiene [12] gave the desired cyclopentadiene as a white solid in about 80% yield (mp. 60 0 C; lit.…”

Section: Methodsmentioning

confidence: 99%

“…3-Methyl-I-phenyl-and 3-methyl-I-naphthyl-cyclopentadiene (la,b), prepared in 80 and 65% yield, respectively, with some modifications, by previously described procedures [11,12], were converted into their 6,6-dimethylfulvene derivatives (2a,b) by pyrrolidine-induced condensation with acetone [ '13] in > 90% yield. Reductive coupling with Mg/CCI 4 gave the Grignard derivatives 3a,b in 15% yield (Scheme 1).…”

Section: Ligand Synthesesmentioning

confidence: 99%

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ansa-Metallocene derivatives

Burger

Hortmann

Diebold

et al. 1991

Journal of Organometallic Chemistry

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Titanocene and zirconocene complexes with a phenyl or I-naphthyl substituent in one ,B-position of each Cs-ring ligand and with an interannular tetramethylethano-or dimethylsilano-bridge have been prepared. Racemic complex isomers, which are formed together with varying amounts of their meso isomers, were separated from the latter and characterised by lH NMR spectroscopy and X-ray crystallographic studies. * For Part XXII see ref. 15.

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Section: Methodsmentioning

confidence: 99%

Section: Ligand Synthesesmentioning

confidence: 99%

ansa-Metallocene derivatives

Burger

Hortmann

Diebold

et al. 1991

Journal of Organometallic Chemistry

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“…of 2,2'-dilithiobiphenyl 4 proceeded in diethyl ether at low temperature to give the respective bis(cyclopentenols) 7a-c as mixtures of diastereomers. These product mixtures were subjected to thermal dehydration without further purification [32]. 5 The bis(cyclopentadienes) arising from this dehydration react immediately to intramolecular cycloadducts 8, despite their bulky substituents.…”

Section: Syntheses Af the Biphenyl-bridged Ligand Systemsmentioning

confidence: 99%

ansa-metallocene derivatives XXXIX biphenyl-bridged metallocene complexes of titanium, zirconium, and vanadium: Syntheses, crystal structures and enantioseparation

Huttenloch¹,

Dorer²,

Rief³

et al. 1997

Journal of Organometallic Chemistry

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Chiral, biphenyl-bridged metallocene complexes of general type biph(3,4-R2CsH2)2MCI2 (biph = 1,1'-biphenyldiyI) were synthesized and characterized. For the dimethyl-substituted titanocenes and zirconocenes (R CH 3 ; M Ti, Zr). preparations with increafed overall yields and an optical resolution method were developed. The bis(2-tetrahydroindenyI) complexes (R,R = (CH 2)4; M = Ti, Zr) were obtained by an alternative synthetic route and characterized with regard to their crystal structures. Syntheses of the phenyl-substituted derivatives (R C 6 H 5; M Ti, Zr) and of a chiral, methyl-substituted vanadocene complex (R CH 3; M V) are also reported.

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“…This method is appropriate for aliphatic as well as for aromatic carbanions and has been used extensively. In 1954 Pauson reported the first synthesis of phenylcyclo- [37]. The reaction is an addition of a metallated arene to the carbonyl-group of an α,β-unsaturated ketone.…”

Section: Addition Of C-nucleophiles To Cyclopentenonesmentioning

confidence: 99%