Showing papers in "Tetrahedron in 1996"

TL;DR: In this paper, an approach to chiral Baylis-hillman adducts is presented. But it does not address the problem of chiral activation and self-dimerization of alkenes.

TL;DR: In this article, a review of short F…H contacts from all of the organofluorine compounds deposited in the Cambridge Structural Database System (CSDS) was carried out and in parallel a theoretical estimate of the energy of such contacts with inter nuclear distance was executed.

TL;DR: Under appropriate conditions, tetraalkylammonium hydrogensulfate can be just as efficient as bromide for facilitating Heck-type reactions as discussed by the authors, and an appropriate selection of the [Pd / Base / QX] catalyst system can allow this type of reactions to be efficiently realised at will, in a strictly anhydrous medium, in water-orgamic solvent mixture or in water alone.

TL;DR: In this article, the main chemical reactions reported between 1992-October 1995 using solid phase support, focusing upon those suitable for synthesizing small molecules, are presented in graphical format in a table according to reaction types.

TL;DR: In this article, a separation of the aromaticity index HOMA, based on experimental geometry, into energetic and geometric contributions is proposed for carbocyclic π-electron systems.

TL;DR: In this paper, the synthesis and electrochemical behavior of a series of fullerene derivatives containing an additional electroactive group, such as ferrocene and tetrathiafulvalene, are investigated.

TL;DR: In this article, aryl halides with pendant amides or sulfonamides are cyclized to form five and six-membered rings, and a similar process can be applied to a ring with pendants.

TL;DR: Aromaticity index (HOMA) = 1 - [dearomatization term due to bond length alternations (GEO) + energetic term (EN)] is extended for hetero-π-electron systems as mentioned in this paper.

TL;DR: In this paper, the amino calix[4]arenes with isocyanates were synthesized by reaction of the amino acyclicarithm of the calix [4] arenes with α-isocyanate and their dimerisation in apolar solvents was established by the formation of mixed dimers consisting of two different urea derivatives.

TL;DR: A review of the literature pertaining to fullerene-based thin film materials is presented in this paper, where the authors define a thin film material as a thermally evaporated and/or solution cast film, polymeric film, or self-assembled monolayer.

TL;DR: In this paper, a unique synthesis of functionalised α-tetralones has emerged from cyclic and acyclic carbon nucleophiles with 2 substituted 1,3-oxazinanes.

TL;DR: Good linear relationships exist between experimental diamagnetic susceptibility enhancements for a wide range of aromatic and hetero-aromatic ring systems and the corresponding resonance energies and/or aromaticity indices as mentioned in this paper.

TL;DR: In this article, the mass spectra (FAB, negative ion) of fullerenols indicated their structure as C 60 derivatives with at least 16 hydroxy groups, and the corresponding polyhydroxylated fullerene derivatives (fullerenol) in moderate overall yields.

TL;DR: In this paper, a 3:1 mixture of cis-stilbene and trans aziridines 2m and 21 is obtained with chiral catalysts in up to 73% ee.

TL;DR: The damage did not involve 1O2 as the active species but rather resulted from a single electron-transfer mechanism between guanosine and 3C60, as shown by comparison experiments with eosin-attached DON-1 and by the use of singlet oxygen quenchers.

TL;DR: In this paper, the authors investigated non-isothermal kinetics induced by microwave heating particularly in terms of spatial distribution of temperature and showed that it is possible to induce localized superheating (eventually thermal runaway in solid case) which leads to localized reaction rate enhancements.