ZfN: Search Results

1	Author		Requires cookie*
	Title	Reaktionskinetische Untersuchungen zur Bildung von Carbeniumionen des Triphenylmethyl-Typs K inetic Investigations of the Form ation of Carbenium Ions of the Triphenylmethyl Type
	Abstract	M a t t h i a s W a l p e r , H a n s -D i e t e r B r a u e r u n d H a r t w ig K e l m The rates of formation of three mono-and three dicarbenium ions of the triphenyl m ethyl type from the corresponding carbinols in trifluoro acetic acid -toluene mixtures were investigated using stopped flow techniques. The reaction mechanisms are discussed in view of the obtained dependencies of the rate constants on acid concentration and temperature.
	Reference	(Z. Naturforsch. 30b, 561—565 [1975]; eingegangen am 12. Mai 1975)
	Published	1975
	Keywords	Carbenium Ions, Triphenylmethyl Ions, Kinetics
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	TEI-XML for	default:Reihe_B/30/ZNB-1975-30b-0561.pdf
	Identifier	ZNB-1975-30b-0561
	Volume	30

2	Author	Bernd Wrackmeyer	Requires cookie*
	Title	Vergleich zwischen n B-und 13 C-chemischen Verschiebungen dreifach koordinierter Borverbindungen und Carbenium-Ionen Comparison between n B and 13 C Chemical Shifts of Three-Coordinate Boron Compounds and Carbenium Ions
	Abstract	The relationship between U B chemical shifts (<5 n B) of trigonal boranes and 13 C® chemical shifts (<5 13 C®) of carbenium ions was found to be more complex than previously reported. The trends observed allow for the comparison of (pp) n bonding between boron and suitable substituents with the TT-charge derealization in carbenium ions. In case of the ferrocenyl boranes and ferrocenyl carbenium ions the markedly different trend in the shielding of 11 B and 13 C® favours a fulvene-like structure for the substituted cyclopenta-dienyl ring in the latter. Structural features are analogously reflected by <5 U B and d 13 C® data for both series of compounds. Comparison of <5 13 C data of organoboranes and carbe-nium ions can be useful in conformational studies. Einführung
	Reference	Z. Naturforsch. 35b, 439—446 (1980); eingegangen am 5. November/14. Dezember 1979
	Published	1980
	Keywords	Boranes, Carbenium Ions, 13 C NMR Spectra, U B NMR Spectra
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	TEI-XML for	default:Reihe_B/35/ZNB-1980-35b-0439.pdf
	Identifier	ZNB-1980-35b-0439
	Volume	35