Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Peter G. Jones"'
Publikováno v:
Liebigs Annalen. 1996:1301-1311
The two 2,3-diethynyl-1,3-butadiene derivatives 1b and 1c were prepared from 2,3-dichloro-1,3-butadiene (26) and the Grignard reagents 19b and 19c by Kumada coupling. Desilylation of 1b provided the parent molecule 1a. The title compounds were used f
Publikováno v:
Liebigs Annalen. 1997:2315-2320
Publikováno v:
Liebigs Annalen. 1997:1499-1504
The catalytic hydrogenation of [2.2]paracyclophane 1 has been reinvestigated with the following results: a) Best yields (95%) of the perhydrocyclophane 3 are obtained when 1 is hydrogenated over ruthenium on charcoal in ethanol at 200°C and 300 atm
Publikováno v:
Liebigs Annalen. 1997:203-209
Areno-anellated [3.3.n]propellanes with n = 2, 3, and 4 are easily accesible by palladium-catalyzed domino coupling processes of the pentalene system 8 with various aryl iodides. The X-ray structure investigations reveled a noteworthy elongation of t
Autor:
Helmut Greiving, Henning Hopf, Peter Bubenitschek, Jean-Pierre Desvergne, Henri Bouas-Laurent, Peter G. Jones
Publikováno v:
Liebigs Annalen. 1995:1949-1956
In order to transfer the so-called topochemical control established by Schmidt and coworkers to fluid solutions, the [2.2]paracyclophane framework was substituted with two acryloyl substituents, one on each of the two decks. The 4 products thus forme
Publikováno v:
Liebigs Annalen. 1995:1981-1985
Osmylation of the Diels-Alder adduct 3 afforded the cis-diol 4, which was dehydrated by acid treatment to the phenol 6. Reaction with tetrafluoroboric acid converted the diol 4 by intramolecular acyl shift into the acetate 7. The relative stereochemi
Publikováno v:
Liebigs Annalen. 1995:1575-1578
Benzenesulfonamides represent a hydrogen donor-acceptor moiety that is changed to a bisacceptor by deprotonation. The dimerization constant of N-tosyl-n-butylamine (7) and N-tosyl-L-alanine (9-H) in CDCl3 and the binding constant of the tetrabutylamm
Publikováno v:
Liebigs Annalen. 1995:1539-1545
Diastereoselective alkylation of the α-position of (S)-(prolinolylmethyl)oxazoles and -oxadiazoles 1 leading to side-chain modified products 2 and 3 was achieved by reaction with LDA and alkylating agents or aldehydes. The products 2 and 3 are precu
Publikováno v:
Liebigs Annalen. 1995:609-612
The structures of the 1:1 and 1:2 addition products of dicyanoacetylene (2) to [2.2]paracyclophane (1) have been determined by X-ray structural analysis as 3 and 5, respectively. In contrast to literature reports, the latter possesses the „crossed
Publikováno v:
Liebigs Annalen. 1995:195-198
A convenient synthesis of the fluorenylidene and the 4,5-diazafluorenylidene moiety is described. The palladium-catalyzed coupling of 6,6′-dimethyl-2,2′-bipyrdine-3,3′-diyl bis(triflate) (2) with phenylacetylene leads to the 4,5-diazafluorenyli