Die schwingungsspektren der tetra-cyclopropyl-verbindungen von silicium, germanium und zinn

Busch, B.; Dehnicke, Kurt

doi:10.1016/s0022-328x(00)82350-5

Cited by 16 publications

(7 citation statements)

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“…In particular, the ring breathing mode (at ∼1166 cm -1 in c-C 3 H 6 ads ) and the symmetric ring deformation mode (at ∼843 cm -1 in c-C 3 H 6 ads ) are present in both spectra. Data for a whole range of molecules containing cyclopropyl groups, − including bromocyclopropane 45 and bicyclopropyl 46 and cyclopropyl complexes, display a ring breathing mode at 1183−1205 cm -1 and a symmetric ring deformation mode in the 784−887 cm -1 region. Hence, a comparison of loss frequencies in spectra 1C and 2C with the literature infrared data for cyclopropyl groups listed in Table strongly suggests the presence of cyclopropyl on the surface.…”

Section: Discussionmentioning

confidence: 99%

Metallacyclobutane and Cyclopropyl Species on Cu(111) and Cu(110)

1998

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Low-energy electron bombardment of cyclopropane submonolayers was used to prepare cyclopropyl and metallacyclobutane species on Cu(110) and Cu(111) surfaces. The thermal chemistry of both species was monitored over the 90−450 K range by taking high-resolution electron energy loss (HREELS) and temperature-programmed desorption (TPD) measurements. Cyclization of the metallacyclobutane species, to eliminate cyclopropane, was found to occur at 205 K. The metallacyclobutane species was characterized by CH stretching losses at 2806 and 2839 cm-1 for Cu(110) and Cu(111), respectively. The cyclopropyl species was found to undergo ring opening to yield a propene desorption product at 290 K. The observed surface chemistry of both of these cyclic C3 species is compared with data from the organometallic, catalysis, and surface science literature.

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Section: Discussionmentioning

confidence: 99%

Metallacyclobutane and Cyclopropyl Species on Cu(111) and Cu(110)

1998

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“…Complexity increases progressively as two or more such groups are attached to a single central atom, , and there has been considerable interest recently − in molecules such as 1 and 2 with four identical secondary alkyl groups around a central atom.…”

Section: Introductionmentioning

confidence: 99%

Conformational Dynamics of Tetraisopropylmethane and of Tetracyclopropylmethane¹

et al. 2002

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Tetraisopropylmethane (1) exists in solution as a mixture of two types of conformers (D2d and S4 time-averaged symmetry) in the ratio 93:7 at -110 degrees C, interconverting with a barrier of 9.7 kcal mol-1. Molecular mechanics calculations and the multiplicity of NMR signals at low temperature allow the assignment of these conformations. The only conformation populated in tetracyclopropylmethane (2) is the same type as the minor conformation (S4 time-averaged symmetry) populated in 1. 13C NMR spectra at about -180 degrees C show that degenerate versions of this conformation interconvert with a barrier of 4.5 kcal mol-1. Molecular mechanics calculations that characterize the six possible conformational types for these molecules, and the most important interconversion pathways, are reported. Calculated and experimental barriers match satisfactorily well.

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“…Die Röntgenstrukturanalyse17 belegt für das Molekül 7 a im Kristall ebenfalls nahezu S 4 ‐Symmetrie (Abbildung 1). Tetracyclopropylsilan Cpr 4 Si, ‐german Cpr 4 Ge und ‐stannan Cpr 4 Sn sind hingegen sämtlich D 2d ‐symmetrisch 3…”

Section: Methodsunclassified

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2013

Nachr Chem

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Bemerkenswerte Symmetrie – bemerkenswerte Synthese: Dicyclopropyldiethenylmethan 2, in mehreren Schritten hergestellt aus Dicyclopropylketon 1, wurde mit Diazomethan in großem Überschuss in Gegenwart von Palladium(II)‐acetat zum strukturell interessanten Tetracyclopropylmethan 3 (92 % isoliert) cyclopropaniert. Durch ringöffnende katalytische Hydrierung wurde 3 quantitativ in 4 überführt. Kristallstrukturanalysen belegen für 3 und 4 S4‐ bzw. D2d‐Symmetrie, in vollkommener Übereinstimmung mit den Ergebnissen von B3LYP/6‐31+G**‐Rechnungen.

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Die schwingungsspektren der tetra-cyclopropyl-verbindungen von silicium, germanium und zinn

Cited by 16 publications

References 7 publications

Metallacyclobutane and Cyclopropyl Species on Cu(111) and Cu(110)

Metallacyclobutane and Cyclopropyl Species on Cu(111) and Cu(110)

Conformational Dynamics of Tetraisopropylmethane and of Tetracyclopropylmethane¹

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Die schwingungsspektren der tetra-cyclopropyl-verbindungen von silicium, germanium und zinn

Cited by 16 publications

References 7 publications

Metallacyclobutane and Cyclopropyl Species on Cu(111) and Cu(110)

Metallacyclobutane and Cyclopropyl Species on Cu(111) and Cu(110)

Conformational Dynamics of Tetraisopropylmethane and of Tetracyclopropylmethane1

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Conformational Dynamics of Tetraisopropylmethane and of Tetracyclopropylmethane¹