Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Georg Rüedi"'
Autor:
Georg Rüedi, Hans-Jürgen Hansen
Publikováno v:
Helvetica Chimica Acta. 87:1968-1989
The substituted isoborneols 1a–1g and 5,6-dehydroisoborneols 6a–6c, readily prepared in excellent yields from (+)-camphor and (+)-5,6-dehydrocamphor (2) by aryl, vinyl, or alkyl Grignard addition in the presence of stoichiometric amounts of CeCl3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8cf579626c8bdbd6ab28d41a9a18b80d
https://doi.org/10.1002/hlca.200490179
https://doi.org/10.1002/hlca.200490179
Publikováno v:
Helvetica Chimica Acta. 87:1990-2021
The 2-exo-substituted fenchol derivatives 1–7, easily prepared from (−)-fenchone in good-to-excellent yields, were pyrolyzed by dynamic gas-phase thermo-isomerization (DGPTI). At temperatures of ca. 620°, the substrates with a hydroxyallyl (1–
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::461db9c21adfc6589c656934977641b6
https://doi.org/10.1002/hlca.200490180
https://doi.org/10.1002/hlca.200490180
Autor:
Hans-Jürgen Hansen, Georg Rüedi
Publikováno v:
Helvetica Chimica Acta. 87:1628-1665
A new method for the smooth and highly efficient preparation of functionalized macrocyclic ketones has been developed. Pyrolysis of medium- and large-ring 3-vinylcycloalkanones by dynamic gas-phase thermo-isomerization (DGPTI) at 600–630° yielded,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5f8d572bbfb92d6c4f0052739a60943
https://doi.org/10.1002/hlca.200490150
https://doi.org/10.1002/hlca.200490150
Publikováno v:
Synlett. :2315-2318
Treatment of α-methylene ketones with excess sodium nitrite and aqueous HCl in THF at reduced temperatures provides an effective tool for the preparation of a variety of 1,2-diketones. The diastereoselective synthesis of the corresponding (Z)-1,2-di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69e203497665b2063b4b3ff583edc59e
https://doi.org/10.1055/s-2004-832815
https://doi.org/10.1055/s-2004-832815
Autor:
Georg Rüedi, Hans-Jürgen Hansen
Publikováno v:
Helvetica Chimica Acta. 84:1017-1047
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ae693d1dc47540780dd94106aefc544
https://doi.org/10.1002/1522-2675(20010516)84:5<1017::aid-hlca1017>3.0.co
https://doi.org/10.1002/1522-2675(20010516)84:5<1017::aid-hlca1017>3.0.co
Publikováno v:
Tetrahedron Letters. 45:7887-7889
A new and very convenient one-carbon ring contraction method is reported. Pyrolysis of α-substituted cycloalkanones at 600–650 °C under flow conditions produces the ring contracted compounds under loss of carbon monoxide. Substrates varying in ri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4841d462cbf1d77bc02be81b7d7b9a7f
https://doi.org/10.1016/j.tetlet.2004.08.149
https://doi.org/10.1016/j.tetlet.2004.08.149
Publikováno v:
Synlett. :1210-1212
Thermo-isomerization of medium- and large-ring 1-phenylcycloalkanols 1e-i at around 650 °C in a flow reactor system delivers the open-chain phenones 4e-i. A reaction mechanism via an open-chain diradical intermediate, followed by an intramolecular h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a51edbac10bb499e73f4810760d55818
https://doi.org/10.1055/s-2003-39915
https://doi.org/10.1055/s-2003-39915
Autor:
Hans-Jürgen Hansen, Georg Rüedi
Publikováno v:
ChemInform. 35
Thermal isomerization of cyclic 3-cyclopropyl ketones under FVP conditions at 620 °C provides a new and convenient route to δ,e-unsaturated cycloalkanones. The synthetic potential of this novel three-carbon ring expansion has been demonstrated by t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8270e892e2d12ff80caceb91bee7a51
https://doi.org/10.1002/chin.200440075
https://doi.org/10.1002/chin.200440075
Publikováno v:
Organic letters. 6(18)
[reaction: see text] A diradical-promoted (n + 2 - 1) ring expansion reaction based on vinyl side chain insertion (+2C) and decarbonylation (-1C) has been developed. Flash vacuum pyrolysis (FVP) of medium- and large-ring 2-trimethylsilyloxy-2-vinyl-c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25923e9a5156392c02640b7bd95b9513
https://pubmed.ncbi.nlm.nih.gov/15330617
https://pubmed.ncbi.nlm.nih.gov/15330617
Publikováno v:
Organic letters. 6(17)
A thermal three-carbon ring expansion based on side chain ring insertion of a cyclopropane moiety is described. Flash vacuum pyrolysis (FVP) of 1-cyclopropyl-cycloalk-3-enol derivatives leads to the three-carbon ring expanded enones with clean retent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::133396c1652d930cce9db82f9f09c396
https://pubmed.ncbi.nlm.nih.gov/15330665
https://pubmed.ncbi.nlm.nih.gov/15330665