Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Ralf Kress"'
Publikováno v:
Zeitschrift für Naturforschung B. 76:133-162
N,N′,N′′-peralkylated guanidinium chlorides and N,N′,N′′-peralkylated guanidines were prepared from N,N′-peralkylated chloroformamidinium chlorides. The alkylation of the guanidines affords N,N′,N′′-persubstituted guanidinium chlo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be4e5750b52150e8e786073bdf461d49
https://doi.org/10.1515/znb-2020-0074
https://doi.org/10.1515/znb-2020-0074
Publikováno v:
IUCrData, Vol 1, Iss 3, p x160478 (2016)
The asymmetric unit of the title salt, C7H18N3+·C7HN4−, comprises one cation and one anion. The N,N,N′,N′,N′′,N′′-hexamethylguanidinium ion shows orientational disorder and two sets of N- and C-atom positions were found, with an occupa
Externí odkaz:
https://doaj.org/article/1ca60114c4ee41c0a343fabb64f6ab59
Publikováno v:
IUCrData, Vol 1, Iss 2, p x160166 (2016)
The asymmetric unit of the title salt, C12H24N42+.2C24H20B−, comprises half a cation and one tetraphenylborate ion. An inversion centre is situated at the mid-point of the triple C[triple-bond]C bond in the cation. The bisamidinium C—N bonds [1.3
Externí odkaz:
https://doaj.org/article/63b2a942c8e5440fa551872330128fdd
Publikováno v:
Zeitschrift für Naturforschung B. 75:697-708
Cyclopropylacetylene and N,N,N′,N′,N′′,N′′-hexamethylguanidinium chloride (1a) react to give the orthoamide derivative 8c, in the presence of sodium hydride. 8c is transformed by elemental iodine to the vinylogous guanidinium salt 6f. Ani
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca99be4b2bf3a3f8222e8e0aac23bb62
https://doi.org/10.1515/znb-2019-0231
https://doi.org/10.1515/znb-2019-0231
Publikováno v:
Zeitschrift für Naturforschung B. 75:685-695
Bis[bis(dibutylamino)methylen]hydrazine 8 is prepared from N,N,N′,N′-tetrabutylchloroformamidinium chloride (4c) and hydrazine. Bromine transforms 8 to the heterocyclic guanidinium salt 15a which is isolated as tetraphenylborate. From N,N,N′,N
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf01206d5c95dee8cf0be166b75fd224
https://doi.org/10.1515/znb-2019-0230
https://doi.org/10.1515/znb-2019-0230
Publikováno v:
Acta Crystallographica Section E: Crystallographic Communications, Vol 71, Iss 12, Pp o1061-o1062 (2015)
The reaction of the orthoamide 1,1,1-tris(dimethylamino)-4-methyl-4-(trimethylsilyloxy)pent-2-yne with bromine in benzene, yields the title salt, C15H33BrN3OSi+·Br−. The C—N bond lengths in the amidinium unit are 1.319 (6) and 1.333 (6) Å, indi
Externí odkaz:
https://doaj.org/article/11df017757b943869075c1a414f809ec
Publikováno v:
Zeitschrift für Naturforschung B. 73:437-455
β-Ionone and camphor were ethynylated to give the alkynols 14, 16, 17 which can be transformed to the alkynolethers 5b, 5i, 5j, 5k, 5l, 5m by treatment with dimethylsulfate and chlorotrimethylsilane, respectively. From the alkynolethers 5h, 5i, 5j/5
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f95dcd6a6f8beff9e281e3f2c1201d0
https://doi.org/10.1515/znb-2018-0011
https://doi.org/10.1515/znb-2018-0011
Publikováno v:
Zeitschrift für Naturforschung B. 70:9-27
N,N,N′,N′,N″,N″-Hexamethylguanidinium chloride 9c was prepared by treating the reaction mixture formed from N,N,N′,N′-tetramethylurea (1a) and phthaloyl chloride (16) with dimethyltrimethylsilylamine 15. N,N,N′,N′-Tetramethyl-chlorofo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e84495fea1e7f79ebb2f04df179000bd
https://doi.org/10.1515/znb-2014-0102
https://doi.org/10.1515/znb-2014-0102
Publikováno v:
Zeitschrift für Naturforschung B. 69:332-350
The preparation of sodium diformamide (7) from formamide and sodium methanolate under azeotropic removal of methanol with cyclohexane, or from formamide and sodium ethanolate in ethanol, is described. Diformamide (8) can be prepared by treatment of s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ef5ddf3c0c8a41e6ad3436c8b946cf1
https://doi.org/10.5560/znb.2014-3269
https://doi.org/10.5560/znb.2014-3269
Publikováno v:
IUCrData, Vol 1, Iss 3, p x160478 (2016)
The asymmetric unit of the title salt, C7H18N3+·C7HN4−, comprises one cation and one anion. TheN,N,N′,N′,N′′,N′′-hexamethylguanidinium ion shows orientational disorder and two sets of N- and C-atom positions were found, with an occupan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b20a7dcc2a67d1714b1211a4a15900a
https://doi.org/10.1107/s2414314616004788
https://doi.org/10.1107/s2414314616004788