共查询到20条相似文献，搜索用时 46 毫秒
1.
《Russian Chemical Bulletin》1994,43(7):1284-1284
Information
Congresses, Conferences, Symposia, Meetings, and Seminars held in 1994 相似文献2.
《Russian Chemical Bulletin》1994,43(1):182-182
Information
Congresses, Conferences, Symposia, Meetings, and Seminars held in 1994 相似文献3.
《Russian Chemical Bulletin》1994,43(2):325
Information
Congresses, conferences, symposia, meetings, and seminars held in 1994 相似文献4.
《Russian Chemical Bulletin》1994,43(4):721
Information Congresses, Conferences, Symposia, Meetings, and Seminars in the Field of Chemical Sciences Held with the Participation of the Russian Academy of Sciences
Congresses, conferences, symposia, meetings, and seminars held in 1994 相似文献5.
《Russian Chemical Bulletin》1994,43(2):325-325
Information Congresses, Conferences, Symposia, Meetings, and Seminars in the Field of Chemical Sciences Held with the Participation of the Russian Academy of Sciences
International conference on chemical and biological disarmament and conversion (MOSCON-94) 相似文献6.
《Russian Chemical Bulletin》1999,48(8):1597-1597
Information
Congresses, Conferences, Symposia, Meetings, and Seminars in the Field of Chemical Sciences held with participation of the Russian Academy of Sciences in 1999 相似文献7.
AbstractsGeneral analytical chemistry
Fundamentals, methods, apparatus, reagents, automation, data processing 相似文献8.
AbstractsGeneral analytical chemistry
Fundamentals, methods, apparatus, reagents, automation, data processing 相似文献9.
News and Announcements
Measurement science summer school in Poznan, Poland 相似文献10.
W. Czysz F. T. Bartsch C. K. Laird R. H. S. M. Matucha et al. 《Fresenius' Journal of Analytical Chemistry》1988,330(1):67-75
Referate1 Allgemeine analytische Chemie
1.1 Grundlagen, Methoden, Apparate, Reagentien, Automation, Datenverarbeitung 相似文献11.
Abstracts1 General analytical chemistry
相似文献12.
《Fresenius' Journal of Analytical Chemistry》1976,280(1):33-56
Referate
1.1 Grundlagen, Methoden, Apparate, Reagentien, Automation, Datenverarbeitung 相似文献13.
W. Czysz W. Schmidt B. R. Glutz R. H. S. C. Hesse et al. 《Fresenius' Journal of Analytical Chemistry》1988,330(3):250-257
Referate1 Allgemeine analytische Chemie
1.1 Grundlagen, methoden, apparate, reagentien, automation, datenverarbeitung 相似文献14.
Abstracts1 General analytical chemistry
1.1 Fundamentals, methods, apparatus, reagents, automation, data processing 相似文献15.
《Russian Chemical Bulletin》2000,49(3):575-578
Information
Congresses, Conferences, Symposia, Meetings, and Seminars in the Field of Chemical Sciences Held with Participation of the Russian Academy of Sciences 相似文献16.
W. D. Halls 《Fresenius' Journal of Analytical Chemistry》1989,334(7):671-695
Posters
Thursday, August 31, 1989 相似文献17.
The relative reactivity (substrate selectivity) of five-membered heterocycles on electrophilic substitution (pyrrole >> furan > selenophene > thiophene) and their positional selectivity (furan > selenophene thiophene > pyrrole) are not consistent. The indicated differences in positional selectivity ( : ratios) of the parent heterocycles show up essentially in orientation on electrophilic substitution reactions of their derivatives and the corresponding benzannelated systems. It was shown that the positional selectivity was reduced in a sequence corresponding to the change in relative stability of the onium states of the elements (O+ < Se+ S+ < N+) and reflects the predominant role of the heteroatoms in stabilizing the -complexes formed on -substitution, in which the positive charge is distributed between the heteroatom and one -carbon atom (in -isom ers four atoms of the ring participate in delocalization of the charge). This interpretation was confirmed by quantum-chemical calculations carried out by the RHF/6-31G(d), MP2/6-31G(d)//RHF(6)-31G(d), and B3LYP/6-31G(d) ab initio methods. 相似文献
18.
Abstracts1 General analytical chemistry
1.1 Fundamentals, methods, apparatus, reagents, automation, data processing 相似文献19.
Abstracts1 General analytical chemistry
1.1 Fundamentals, methods, apparatus, reagents, automation, data processing 相似文献20.
W. Czysz R. H. S. E. Svatek F. Jancik J. S. Dunnett et al. 《Fresenius' Journal of Analytical Chemistry》1991,340(5):280-340