Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Manfred Heuschmann"'
Publikováno v:
Heteroatom Chemistry. 27:75-82
The CuI-catalyzed addition of iodine to the CC triple bond of 3,3-diethoxy-1-phenyl propyne (1) unexpectedly leads to the new cyclization products 2,3-diiodo-1H-inden-1-one (2) and 1-ethoxy-2,3-diiodo-1H-indene (3). Both compounds were isolated and c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::097df91965375a14ab02830ace4e9d91
https://doi.org/10.1002/hc.21303
https://doi.org/10.1002/hc.21303
Publikováno v:
Helvetica Chimica Acta. 88:1491-1518
Cycloadditions of 2-cyclopropylidene-1,3-dimethylimidazolidine (1), a strong, electron-rich C-nucleophile, with a variety of aryl-substituted 1,2,4-triazines occur at temperatures between −100 and +100°, depending on the substitution pattern. At l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::36d604af0be6dbf54bf29eeca6cf67d6
https://doi.org/10.1002/hlca.200590120
https://doi.org/10.1002/hlca.200590120
Publikováno v:
Tetrahedron. 56:4213-4218
The regioselectivity of the two-step Diels–Alder reaction of unsymmetrically substituted tetrazines 4 with 2-cyclopropylidene-imidazolidine 6 is investigated. The first reversible step of the cycloaddition affording zwitterions 7 and 8 is controlle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6dff5cecd7dc13ce79938534b83b384b
https://doi.org/10.1016/s0040-4020(00)00346-x
https://doi.org/10.1016/s0040-4020(00)00346-x
Autor:
Manfred Heuschmann, Johannes Betz
Publikováno v:
Tetrahedron Letters. 36:4043-4046
Two equivalents of vinylmagnesium bromide add to imines 1 in the presence of cerium trichloride to form homoallylic amines 3 as 2:1-adducts, Z-diastereomers being preferred by a margin of 88:12 to 71:29. Suitable chiral imines 1g-i are transformed to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b78f488a6cda99acfc4a367a4454f58
https://doi.org/10.1016/0040-4039(95)00670-8
https://doi.org/10.1016/0040-4039(95)00670-8
Autor:
Manfred Heuschmann, Johannes Betz
Publikováno v:
ChemInform. 26
Two equivalents of vinylmagnesium bromide add to imines 1 in the presence of cerium trichloride to form homoallylic amines 3 as 2:1-adducts, Z-diastereomers being preferred by a margin of 88:12 to 71:29. Suitable chiral imines 1g-i are transformed to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::182b37e3735e43dad4b222f35d01193e
https://doi.org/10.1002/chin.199544074
https://doi.org/10.1002/chin.199544074
Autor:
Ursula Gruseck, Manfred Heuschmann
Publikováno v:
Chemische Berichte. 123:1905-1909
2-Methylen-1,3-dioxolane (1) and the methyl acrylates or crotonates 2 form [2+2] cycloadducts 3 which are reduced to give alcohols 6. Oxidation of these alcohols at low temperatures leads to unstable aldehydes 7, which either rearrange to dihydropyra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1033e31e39a4c029a5301300e788355
https://doi.org/10.1002/cber.19901230924
https://doi.org/10.1002/cber.19901230924
Autor:
Ursula Gruseck, Manfred Heuschmann
Publikováno v:
Chemische Berichte. 123:1911-1926
Donor-acceptor-substituted vinylcyclobutanes 1 rearrange to cyclohexenes 2 at temperatures between 20 and 195°C. In solvents of low polarity, [2+2] cycloreversion competes with ring enlargement. Under acidic conditions, addition of nucleophiles to v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a3ad0001c68f77edd9d90f4348bf419
https://doi.org/10.1002/cber.19901230925
https://doi.org/10.1002/cber.19901230925
Autor:
Ursula Gruseck, Manfred Heuschmann
Publikováno v:
ChemInform. 21
2-Methylen-1,3-dioxolane (1) and the methyl acrylates or crotonates 2 form [2+2] cycloadducts 3 which are reduced to give alcohols 6. Oxidation of these alcohols at low temperatures leads to unstable aldehydes 7, which either rearrange to dihydropyra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3509a3f8bb2a7a1e7430c258b8496aec
https://doi.org/10.1002/chin.199048102
https://doi.org/10.1002/chin.199048102
Autor:
Manfred Heuschmann, Ursula Gruseck
Publikováno v:
ChemInform. 21
Donor-acceptor-substituted vinylcyclobutanes 1 rearrange to cyclohexenes 2 at temperatures between 20 and 195°C. In solvents of low polarity, [2+2] cycloreversion competes with ring enlargement. Under acidic conditions, addition of nucleophiles to v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::283f546a2fe652887ec682aa79f38bac
https://doi.org/10.1002/chin.199046090
https://doi.org/10.1002/chin.199046090
Publikováno v:
Helvetica Chimica Acta; Jun2005, Vol. 88 Issue 6, p1491-1518, 28p