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  • 1
    ISSN: 0009-2940
    Keywords: Fluorophosphoranes ; Donor-acceptor interaction ; Azonium salts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of the tetrafluorophosphoranes RPF4 [R = CH3, C6H5, C6F5, (CH3)3SiCH2, and 2,5-(CH3)2C6H3] with N,N,Ń-trimethyl-N′-(trimethylsilyl))ethylenediamine (1) yields the corresponding triflurophosphoranes 2-6 by cleavage of the Si - N bond and elimination of (CH3)3SiF. In an analogous reaction the difluorophosphoranes R1R2PF2N(CH3)CH2CJ2N-(CH3)2 (R1 = R2 = C6H5, 7: R1 = C6H5, R2 = C4H4N, 8) are formed. Some of these N,N,Ń-trimethylethylenediamine-substituted di- and trifluorophosphoranes react with PF5 as a Lewis acid to form the corresponding azonium hexafluorophosphates 9-12 as a result of fluoride abstraction and intramolecular (CH3)2N→P donor-acceptor interaction. Compound 13 shows dynamic behaviour in solution. An exchange process is observed for the axial and equatorial fluorine atoms by 19F- and 31P-NMR spectroscopy. An X-ray structure analysis of the compounds 10 - 12 reveals the expected trigonal-bipyramidal geometry at phosphorus. The ethylenediamine ligand is found to form a chelate ring, whereby one axial and one equatorial site are bridged. The coordinative P - N bonds are very long (up to 207 pm).
    Additional Material: 4 Ill.
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  • 2
    ISSN: 0009-2940
    Keywords: Ethylenediamine, N,N,N′-trimethyl- ; Transition-metal complexes, P - N coordination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-{[2-(Dimethylamino)ethyl]methylamino}-1,3,2-benzodioxaphosphole as a Ligand in Transition-Metal Complexes. Crystal and Molecular Structure of a Tetracarbonyl Chromium DerivativeComplexes of the zerovalent transition metals chromium, molybdenum, iron, and platinum react with the title phosphorus-(III)-compound 3 to give a range of different products: in the coordination compounds 4 and 5, 3 functions as a bidentate ligand, coordinating to the metal through the phosphorus and the nitrogen atom of the dimethylamino group. The structure of 4 was confirmed by a single-crystal X-ray analysis, showing a ligand “bite” angle of 91.0, 91.4° in two independent molecules. In the compounds 7 - 9, involving Mo, Fe, and Pt as a central atom, 3 coordinates solely through P(III). For the platinum(O) complex 9 31P-NMR spectroscopy revealed a dynamic behaviour at room temperature.
    Additional Material: 1 Ill.
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  • 3
    ISSN: 0009-2940
    Keywords: Phospholenes ; Phosphepines ; Ring expansion reactions ; Perfluorinated diketones ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New Phospholene and Phosphepine Derivatives from λ3-Phosphorus Compounds and Hexafluoroacetone or Perfluorinated α-DiketonesThe reaction of the bis(2-chloroethyl)amino-substituted benzoxazaphosphorinone 1 with hexafluoroacetone (HFA) proceeds with insertion of the carbonyl group of HFA into the heterocycle of 1 to form the oxazaphosphepinedione 2. Triethyl phosphite (3) and triphenyl phosphite (4) react with the perfluorinated diketones 5 and 6 with formation of the pentaoxyphosphoranes 7-10 containing a dioxaphospholene ring system. The reaction of the (2-chloroethyl)amino- and bis(2-chloroethyl)amino-substituted 1,3,5,2-triazaphosphorinanediones 11-14 with the perfluorinated diketone C2F5C(:O)C(:O)CF3 (15) furnishes spirophosphorane derivatives with the dioxaphospholene ring system, 16 and 17, in two cases only. Compound 1 and 2-[bis(2-chloroethyl)-amino]-4H-1,3,2-benzodioxaphosphorin-4-one (18) react with the perfluorinated α-diketones 5 and 6 with insertion of the diketones into the heterocycle of 1 and 18 with formation of compounds 19-22 containing dioxa- and oxazaphosphepinone ring systems. The expected oxidative addition of the diketones to λ3P with formation of spirophosphoranes was not observed. Compounds 19-22 were obtained as mixtures of isomers (19a/b-22a/b). Single crystal X-ray structure analyses were conducted on 2 and 9. The seven-membered ring of 2 displays a “tub” conformation, with the O and benzo C atoms lying out of the plane of the other four atoms. The two independent molecules of 9 are similar, but differ in the degree of distortion from trigonal-bipyramidal geometry of phosphorus.
    Additional Material: 2 Ill.
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  • 4
    ISSN: 0009-2940
    Keywords: 1,3,5-Trimethylbiuret ; Ethylenediamine, N,N,N′-trimethyl- ; Iron complexes ; Chromium complexes ; Molybdenum complexes ; 1,3,5,2-Triazaphosphorinanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Compounds with the 1,3,5,2-Triazaphosphorinane Skeleton: Synthesis and Coordination Chemistry of Novel N,N,N′-Trimethylethylenediamine-Substituted Compounds with Three-and Four-Coordinate PhosphorusSubstitution of chlorine for the N,N,N′-trimethylethylenediamine group in the 1,3,5-trimethylbiuret derivative 2 produced 4. The reaction of the 1,3,5,2-triazaphosphorinane 4 with sulfur furnished the expected P(=S) derivative 5. Reaction of 4 with methyl iodide led to the formation of the ammonium iodide 6 by methylation of the nitrogen atom of the terminal NMe2 group while the phosphorus atom of 4 remained unaffected. The structure of 6 was confirmed by a single-crystal X-ray structure analysis. In the unusual reaction of 4 with Br2 the bromodimethylammonium-bromophosphonium dibromide 7 was formed. The reaction of 4 with Fe2(CO)9 furnished the expected Fe(CO)4 complex 8 while with (C7H8)Cr(CO)4 (C7H8=norbornadiene) 9 was obtained. In 9, norbornadiene is replaced by one molecule of 4, which is coordinated by phosphorus and the nitrogen atom of the NMe2 group. In the reaction of 4 with C7H8Mo(CO)4 (C7H8=norbornadiene) the complexes 10a and 10b were formed. In 10a, the P(III) atom of 4 is coordinated to Mo; the second coordination site at Mo(CO)4 is occupied by the nitrogen atom of the terminal NMe2 group. In 10b, the nitrogen atoms of the PN(Me) and of the NMe2 grouping are coordinated to Mo, with formation of a five-membered ring.
    Additional Material: 1 Tab.
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  • 5
    ISSN: 0009-2940
    Keywords: Benzoxazaphosphorinones ; Rearrangements ; Ring-expansion reaction ; Insertion reaction ; Gold complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of some Dihydrobenzoxazaphosphorinones with Nucleophiles; Unusual Oxidation, Insertion, and Rearrangement Products and their Characterisation by Single-Crystal X-Ray AnalysisThe reaction of 2-chloro-1,2-dihydro-1-methyl-4H-3,1,2-oxazaphosphorin-4-one (2) and its 2-diethylamino-substituted derivative 3 with various nucleophiles yielded novel and sometimes unexpected products. Hydrolysis of 2 furnished the 2-hydroxybenzoxazaphosphorinone 4. In the presence of small amounts of water, two molecules of 4 were transformed into 5, accompanied by cleavage of one of the heterocyclic rings. The reaction of 2 with sodium chlorodifluoroacetate led, possibly in an Arbuzov-type reaction, to compound 6. The 1,5-diaza-4,8-cyclooctanedione system 7 was formed by reaction of 2 with 1,2,4,5-tetrakis(trimethylsilyloxy)benzene with concomitant loss of the phosphorus-containing group. 2,2′-Bis(trimethylsiloxy)biphenyl reacted with 2 in the expected fashion to form the diphosphorus compound 8. From 8 the chlorogold(I) complex 9 was obtained. The reaction of 3 with tetrachloro- and tetrabromo-o-benzoquinone did not lead to the expected spirocyclic products by oxidative addition of the quinone system to λ3P. Instead, cleavage and expansion of the heterocyclic ring system with formation of the tricyclic derivatives 10 and 11 took place. Compounds 5-10 were subjected to X-ray structure analysis. Compound 5 exists as two modifications 5a and 5b, which differ mainly in the relative orientation of the phenyl rings; intramolecular N-H…O hydrogen bonds are observed. Bond lengths at the halo-substituted carbon atom in 6 indicate steric crowding. The central 8-membered ring of 7 displays a “tub” conformation. Compound 8 undergoes a conformational change on complexation to the two gold(I) centres; one of the torsion angles C-O(exocyc.)-P-N is -163° in 8, but 95° in 9. The structure determination of 10 served only to confirm the (unexpected) connectivity; the crystal quality was too poor to allow quantitative conclusions.
    Additional Material: 6 Ill.
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  • 6
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The N,N,N′-trimethylethylenediaminetetrafluorophosphate, 4, was formed in the unusual reaction of N,N,N′-trimethyl-N′-trimethylsilylethylenediamine, 1, with the N—P-bonded tetrafluorophosphoranes, dimethylaminotetrafluorophosphorane, 2, or morpholinotetrafluorophosphorane, 3. There was no evidence for the cleavage of a P—F bond in the tetrafluorophosphoranes (with formation of Me3SiF); instead, the Si—N compounds, R2N—SiMe3 (R2 = Me2 or O(CH2CH2)2) were formed. The 19F and 31P NMR spectra of 4 at room temperature indicated dynamic behavior. The X-ray crystal structure analysis of 4 revealed the presence of a five-membered ring, formally as a result of intramolecular donor-acceptor interaction (P—N = 196.5 pm) between the nitrogen atom of the Me2N group and phosphorus.
    Additional Material: 3 Ill.
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  • 7
    ISSN: 0044-2313
    Keywords: Diazaphosphorinane derivatives ; ammonium-phosphonium dichloride ; C—Cl bond cleavage ; NMR spectroscopy ; mass spectrometry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Intramolecularly Stabilized Diazaphosphorinane Derivatives with the Trimethylethylenediamine and the Tetramethylguanidine Group as Substituents at Phosphorus: Investigation of intramolecular Me2N → P InteractionsIn the reaction of trimethylchlorophosphonium chloride 1 with N-trimethylsilyl-N′,N′,N″,N″-tetramethylguanidine 2 the expected guanidine-substituted trimethylphosphonium chloride 3 was formed, presumably via the ammonium chloride 3a which could not be isolated. By contrast, the reaction of the related chloromethyldimethylchlorophosphonium chloride 5 with N-trimethylsilyl-N,N′,N′-trimethylethylenediamine 6 and N-trimethylsilyl-N′,N′-dimethylethylene diamine, 7, respectively, furnished in an unusual fashion six-membered heterocycles, the ammonium-phosphonium dichlorides 10 and 11. Their formation involved cleavage of both the P—Cl and the C—Cl bond, followed by intramolecular C←N-acceptor-donor interaction. A similar C←N interaction was not observed in the reaction of 5 with 2, and the acyclic product 12 was formed. The reaction of chloromethylmethylchlorophosphine 13 with the hydrogen peroxide/urea 1:1-adduct led to chloromethylmethylphosphinic acid 14. Attempts at the reaction of 14 with 2 or with SOCl2 were unsuccessful. The reaction products were characterized by 1H-, 13C-, 31P- and, in two cases, by 15N-NMR-spectroscopy.
    Notes: Durch Umsetzung von Trimethylchlorphosphoniumchlorid 1 mit N-Trimethylsilyl-N′,N′,N″,N″-tetramethylguanidin 2 wurde, vermutlich über das nicht isolierbare Ammoniumchlorid 3a, das erwartete, guanidinsubstituierte Trimethylphosphoniumchlorid 3 gebildet. Die Umsetzung des mit 1 verwandten Chlormethyldimethylchlorphosphoniumchlorids 5 mit N-Trimethylsilyl-N,N′,N′-trimethylethylendiamin 6 bzw. N-Trimethylsilyl-N′,N′-dimethylethylendiamin 7 lieferte in einer ungewöhnlichen Reaktion sechsgliedrige Heterocyclen, die Ammonium-Phosphonium-Dichloride 10 und 11. Ihre Bildung erfolgte durch Spaltung einer P—Cl- und einer C—Cl-Bindung und Ausbildung einer C ← N-Akzeptor-Donator-Koordination. Analoges Verhalten wurde bei der Umsetzung von 5 mit N-Trimethylsilyl-N′,N′,N″,N″-tetramethylguanidin 2 nicht beobachtet. Reaktionsprodukt war die acycliche Verbindung 12, die keine C←N-Wechselwirkung zeigte. Die Umsetzung von Chlormethylmethylchlorphosphin 13 mit Wasserstoffperoxid-Harnstoff-1:1-Addukt führte zur Bildung von Chlormethylmethylphosphinsäure 14. Die Umsetzung von 14 mit 2 oder SOCl2 gelang nicht. Die Reaktionsprodukte wurden durch 1H-, 13C-, 31P- und, in zwei Fällen, durch 15N-NMR-Spektroskopie charakterisiert.
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