Die reaktion von 2.6-dimethylnaphthalin mit diazoessigester

Thermal decomposition of ethyl diazoacetate in 6 molar equivalents of 2.6-dimethylnaphthalene yielded 58 per cent of carbethoxycarbene monoadducts which comprise 74 per cent ethyl 2.6-dimethyl-1a.7b-dihydro-1H-cyclopropa[a]naphthalene-(1)-carboxylate (VI), 15 per cent of the isomeric 1b.5-dimethyl compound VIII and 9 per cent of ethyl 2.7-dimethyl-5H-benzocyclohepten-(6)-carboxylate (X). The higher boiling fraction of the product contained 11 per cent of diadduct XXIV. These compounds were structurally elucidated, especially by oxidation and hydrogenation, and were characterised by U.V. and I.R. spectra. The partial rate factors of carbethoxycarbene addition, with reference to the 1.2-bond of naphthalene taken as 1.0, were 1.4 for the 1.2-bond and 4.2 for the 3.4-bond of 2.6-dimethylnaphthalene.     

Die photochemische reaktion von decacarbonyl-dirhenium mit cyclischen und acyclischen olefinen

Re₂(CO)₁₀ reacts on photochemical induction with acyclic or cyclic olefins with one to four CC bonds. The main products are octacarbonyl-μ-hydrido-μ-olefinyl-dirheniumm complexes. Isomerism of the olefinyl ligands is observed. In some cases the simple substitution products enneacarbonyl-η-olefindirhenium can be isolated. With cyclopentadiene and cycloheptatriene tricarbonyl-η⁵-cyclodienylrhenium compounds are the favoured side products. Ethylene yields Re₂(CO)₈H complexes with vinyl and 1-buten-1-yl bridges. Additionally trinuclear complexes with one and two vinyl bridges are obtained. The complexes are characterized spectroscopically.     

Zur reaktion von N-Hydroxysuccinimid mit dicyclohexylcarbodiimid

N-Hydroxysuccinimide reacts with dicyclohexylcarbodiimid in molar-proportion (3:1) forming dicyclohexylurea and succinimide oxycarbonyl-β-alanin-hydroxysuccinimid ester 7. The structure of 7 has been confirmed by NMR and chemical methods.     

Arylvanadium-verbindungen XI. Zur reaktion von trimesitylvanadium mit ketonen

Trimesitylvanadium in solution reacts with a series of ketones. Depending upon the structures of the ketones these reactions yield olefins, alcohols or a radical, respectively. Sterically hindered ketones only form coordination compounds with trimesitylvanadium or do not react at all.     

Zur reaktion von tricyclopentadienyl-lanthanoid-komplexen mit 1-alkinen

Contrary to the prediction based on published pK₃-data (for cyclopentadiene and phenylethyne), Cp₃Ln^III-complexes react readily with various 1-alkynes, HCCR, by liberating cyclopentadiene. While for Ln = Yb and R = n-alkyl the formation of the novel metallacycles [Cp₂YbCCR]₃ involving

bridges and quite exceptional ¹H NMR spectroscopic features is preferred, the “lighter” Ln-element Nd apparently avoids the formation of corresponding {Cp₂NdCCR} moieties with still intact μ-(CCR) ligands in favour of a partial regeneration of Cp₃Nd.     

Radikalische Darstellung von Polymeren mit Hydroxyl-Endgruppen. 3. Mitt. Darstellung von Polyvinylacetat

Ohne Zusammenfassung     

Die Darstellung von hochspezifischem

Ohne Zusammenfassung     

Die Darstellung von Vergleichsproben von Titanwasserstoff

Ohne Zusammenfassung     

Zur reaktion von metallkoordiniertem kohlenmonoxid mit yliden: XIV. Eisenacyl-phosphor-ylide mit elektronenreicher organometallgruppierung

Treatment of [C₅Me₅(CO)₃Fe]BF₄ (I) with the phosphines Me₃P and Et₃P under thermal or photochemical conditions yields the novel iron salts [C₅Me₅-(CO)₂(R₃P)Fe]BF₄ (R = Me (IIa), R = Et (IIb)) and [C₅Me₅(CO)(Me₃P)₂Fe]BF₄ (IIc). The reaction of I and IIa with two mol of the ylide Me₃PCH₂ leads to the formation of the ironacyl-ylides C₅Me₅(CO)(L)FeC(O)CHPMe₃ (L = CO (IVa), Me₃P (IVb)). IVa selectively reacts at the “ylidic” carbon with the electrophilic reagents MeI, MeOSO₂F, Me₃SiOSO₂CF₃ to give the ironacyl-phosphonium salts [C₅Me₅(CO)₂FeC(O)CH(R)PMe₃] X (VaVc), while IVb is partially converted to [C₅Me₅(CO)₂FeC(O)CH₂PMe₃]BF₄ (IIIa) is obtained together with [C₅Me₅-(CO)₂Fe]₂ from I and IVa.