• Keine Ergebnisse gefunden

Optically Active Cyclopentadienyl Ligands from the Chiral Pool, Part 1. The Synthetic Utility of a Camphor-Derived Pentafulvene Valeri Quindt, Mark Wallasch, Gotthelf Wolmershäuser, and Helmut Sitzmann*

N/A
N/A
Info
Herunterladen
Protected

Academic year: 2022

Aktie "Optically Active Cyclopentadienyl Ligands from the Chiral Pool, Part 1. The Synthetic Utility of a Camphor-Derived Pentafulvene Valeri Quindt, Mark Wallasch, Gotthelf Wolmershäuser, and Helmut Sitzmann*"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Jetzt herunterladen ( 1 Seite )

Volltext

(1)

Optically Active Cyclopentadienyl Ligands from the Chiral Pool, Part 1.

The Synthetic Utility of a Camphor-Derived Pentafulvene

Valeri Quindt, Mark Wallasch, Gotthelf Wolmershäuser, and Helmut Sitzmann*

Fachbereich Chemie der Universität Kaiserslautern, Erwin-Schrödinger-Str., D-67663 Kaiserslautern

Reprint requests to H. Sitzmann. Fax: +49(0) 6 31-2 05-21 87.

E-mail: sitzmann@chemie.uni-kl.de

Z. Naturforsch.57 b, 338Ð342 (2002); received November 8, 2001 Camphor, Ferrocene, Chiral Ligands

Starting from (1R)-(+)-camphor, the reaction with cyclopentadienylmagnesium chloride gave the corresponding tertiary alcohol 1, which was transformed into the optically active pentafulvene 5-(1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)cyclopentadiene (2) by acid- catalyzed water elimination. Deprotonation withtert-butyllithium yielded the corresponding lithium 5-{(1R)-1,7,7-trimethylbicyclo[2.2.1]hept-2-en-2-yl}cyclopentadienide (3), which was converted into the non-racemic 1,1⬘-bis{(1R)-1,7,7-trimethylbicyclo[2.2.1]hept-2-en-2- yl}ferrocene (4).4forms orthorhombic crystals of the space groupP212121witha= 7.7163(4), b= 10.7381(6), andc= 28.804(2) A˚ , which have been subjected to X-ray diffraction.

Referenzen

Jetzt herunterladen ( PDF - 1 Seite - 22.86 KB )

ÄHNLICHE DOKUMENTE

The Importance of Being Active

Since the 1970s, his research produces evidence that the fruit fly, Drosophila melanogaster, is capable of spontaneous behavioral activity, and that the flies use it to control

Active tectonic deformation at the transition from the

The mean velocity of the stations south of the Mur-Mürz valley and the Vienna basin transfer fault system, relative to the stations located in the north, amounts to 1.1 mm/year..

Formation of Quaternary Stereogenic Centers by Wagner-Meerwein Rearrangement – Synthesis of Optically Active Cyclopentadienyl Complexes from Borneol and Fenchol

The development of optically active cyclopentadienyl complexes as enantioselective catalysts calls for simple synthetic procedures for cyclopentadienes with optically active

Starting from diethanolamine, a series of N-substituted diethanol derivatives were prepared which were converted in the subsequent reaction step into the corresponding carboxylic acids by treatment with chloroacetic acid

This was subsequently dissolved in hot anhydrous ethanol (300 ml), the NaCl precipitate filtered off, washed with hot ethanol (5 × 50 ml) and the solution was evaporated again to

Optically Active Cyclopentadienyl Ligands from the Chiral Pool, Part 1. The Synthetic Utility of a Camphor-Derived Pentafulvene Valeri Quindt, Mark Wallasch, Gotthelf Wolmershäuser, and Helmut Sitzmann*

Starting from (1R)-(+)-camphor, the reaction with cyclopentadienylmagnesium chloride gave the corresponding tertiary alcohol 1, which was transformed into the optically

Where does the optically detectable aerosol in the European Arctic come from?

Long-term aerosol optical depth (AOD) data from Ny-˚ Alesund and Sodankyl¨ a as well as short data from a campaign on a Russian drifting station were analysed by air

Scientific Highlights from Observations of Active Galactic Nuclei with the MAGIC Telescope

Si- multaneous optical R-band observations, by the Tuorla Observatory Blazar Monitoring Program revealed that during the MAGIC observations, the gamma-ray source was in a generally

Orientation and organization of the presynaptic active zone protein Bassoon: from the Golgi to the synapse

Since their discovery roughly two decades ago, CAZ proteins of central nervous system synapses have been extensively investigated for their function. A range of