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Dive into the research topics where Rolf Appel is active.

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Featured researches published by Rolf Appel.


Journal of Organometallic Chemistry | 1976

Vereinfachte synthese von organosilylphosphinen

Rolf Appel; Klaus Geisler

Abstract Organosilylphosphines can easily be synthesized by cleavage of diarylphosphines with lithium and further reaction with chlorotimethylsilane. Additionally three other possibilities for the synthesis of phenylbis(trimethylsilyl)phosphine are described.


Tetrahedron Letters | 1986

1,3-Diphospha-1,3-butadiene

Rolf Appel; Peter Fölling; Winfried Schuhn; Falk Knoch

Abstract The first stable acyclic 1,3-diphosphabutadiene was prepared by reaction of phosphaalkene 2 with 2,4,6-tri-tert-butylphenylphosphaketene 1 .


Tetrahedron Letters | 1980

(Phosphinomethylen)phosphane, 1,3,4,6-tetraphosphahexadiene-(1,5) und neue 1,3-diphosphetane aus R-N=CCl2 und PhPTms2

Rolf Appel; Benno Laubach

Abstract Interaction of different halogenated isocyanide dichlorides with phenylbis(trimethylsilyl)phosphine either yields 1,3,4,6-tetraphosphahexadienes-(1,5) via the (phosphinomethylene)phosphines or 1,3-diphosphetanes by way of the “monophosphacarbodiimides”.


Journal of Organometallic Chemistry | 1987

Niederkoordinierte phosphorverbindungen ☆: LIII. 1,3-Diphosphaallyl-nickelkomplexe

Rolf Appel; W. Schuhn; Falk Knoch

Abstract (R = 2,4,6-tri-t-butylphenyl) and (R = 2,4,6-tri-t-butylphenyl) are two new nickel complexes with a 1,3-diphosphaallyl ligand. Both structures have been determined by X-ray analysis.


Journal of Organometallic Chemistry | 1986

1η-komplexierung eines 1-phosphaallens mit nickeltetracarbonyl

Rolf Appel; F. Knoch; V. Winkhaus

Abstract η 1 -[9CO 3 Ni(RPCCPh 2 )] (R = 2,4,6-tri-t-butylphenyl), the first complex of a 1-phosphaallene has been isolated and the structure has been determined by X-ray analysis.


Journal of Organometallic Chemistry | 1988

Niederkoordinierte phosphorverbindungen: LXVII. Zur komplexierung phosphorsubstitueirter butadiensysteme☆

Rolf Appel; B. Niemann; W. Schuhn; N. Siabalis

Abstract Treatment of the 1,3-diphospha(1,3)butadiene (I) with Ni(CO)4 or Fe2(CO)9 affords η1- or η4-coordination to a M(CO)3 fragment. Complex formation by the reaction of 1,4-diphospha(1,3)butadiene (IV) with C7H8M(CO)4 orM(CO)5THF (M = Cr, Mo, W) yields the doubly η1-coordinated compounds, which readily undergo E/Z-isomerization compared to IV. Bonding of a Mo(CO)4 fragment to the 1,2,4-triphospha(1,3)butadiene (VIII) was attained by two different reactions.


Journal of Molecular Structure | 1978

Vibrational Spectra of the Cyclic SN-Compounds S4N4, S4N4H4 and S3N3Cl3

Angelika Turowsli; Rolf Appel; Wolfgang Sawodny; Karl Molt

Abstract The IR and Raman spectra of solid and dissolved S 4 N 4 , S 4 N 4 H 4 , S 4 N 4 D 4 and S 3 N 3 Cl 3 have been recorded and are assigned according to D 2d , C 4v and C 3v symmetry respectively. In the solid state, many forbidden bands and splittings of degenerate vibrations are observed because of the symmetry lowering in the crystals. Due to the different size and shape of the rings and to strong coupling of the normal modes there is no clear correlation between the SN ring stretching vibrations and the strength of the SN bonds, except for the one of the E modes. However, the stretching force constant show the trend expected from changes in interatomic distances.


Journal of Organometallic Chemistry | 1975

Zur kenntnis nichtmetallischer iminverbindungen : LXVIII . 2,4,1η5,3η3-diazadiphosphetidin, ein phosphorstickstoff-vierring mit 3- und 5-bindigem phosphor☆

Rolf Appel; Mechthild Halstenberg

Zusammenfassung In Fortfuhrung unserer Versuche, viergliedrige Phosphor-StickstoffHeterocyclen durch Reaktion yon Aminoiminophosphinen (I) [1,2] mit geeigneten Imiddonoren wir Iminophosphoranen [3] oder Iminosulfuranen [4] zu synthetisieren, haben wit jetzt auch Bis(trimethylsilyl)schwefeldiimid mit I umgesetzt. Wir fanden, dass die Reaktion erwartungsgemass unter Imid-Ubertragung verlauft, die Natur der gebildeten Reaktionsprodukte abet stark von dem angewandten Molverhaltnis abhangt. Uberraschenderweise wurde mit einem Unterschuss an Schwefeldiimid eine Substanz isoliert, die keinen Schwefel enthielt und bei der es sich nach der Elementaranalyse um ein Addukt aus I und dem daraus dutch Imid-Ubertragung entstandenen Bis(trimethylsilyl)amino-bis(trimethylsilylimino)phosphoran (II) handelt. Besonders einfach und ohne Nebenprodukte lasst sich III dementsprechend aus I und II nach Gl. 1 darstellen. Aufgrund von Molmassebestimmungen, NMR- und Massenspektren nehmen wit an, dass dieser Verbindung die Struktur eines 2,4-Bis(trimethylsilyl)-l,3-bis[bis(trimethylsilyl)amino]-1-trimethylsilylimido-2,4,1 η 5 , 3η 3 - diazadiphosphetidins (III) zukommt.


Phosphorus Sulfur and Silicon and The Related Elements | 1990

Phospha-carba-oligo-enes, Synthesis and Reactivity

Rolf Appel

Abstract The synthesis of various mono-, di- and mphosphabutadienes, of two hiphosphapentadienes and of several mono-, di- and tetraphospha-hexadienes is being reported. Their chemistry demonstrates an astonishing relationship to the corresponding olefinic compounds.


Phosphorus Sulfur and Silicon and The Related Elements | 1988

NIEDERKOORDINIERTE PHOSPHORVERBINDUNGEN 61.1 VERBRÖCKTE P,P,P′,P′-TETRAKIS(METHYLENE)-BISPHOSPHORANE

Rolf Appel; Peter Schulte; Falk Knoch

Abstract Synthesis and properties of up to now unknown P,P,P′,P′-Tetrakis(methylene)-[sgrave]3μ5-bisphosphoranes are reported.

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