Inspired by the Salters Approach (UK) and ChemCom (USA), units for a new curriculum for chemistry teaching are being developed in Germany based on theories of scientific literacy, motivation, and situated learning. The curriculum follows a context-based approach. Rather than using the structure of the discipline, it generates basic chemical concepts from issues relevant to the learners, starting with the learners' ideas and questions. The teaching methodology of the course builds strongly on self-directed and cooperative forms of learning activities in the classroom. Currently, a large implementation program is under way with working groups of teachers in 14 of the 16 federal states (Bundesländer) in Germany. This program combines the development of teaching units, their implementation in schools, and the professional development of teachers. Now in its third year, the project has yielded positive results and funds for continuation have been granted.
F3SiPH2 wird nach Gl.(1)
in Ausbeuten um 60% gebildet, während Br2SiF2 und Br3SiF auf Grund von Dismutationen nicht zu den entsprechenden Silylphosphinen führen. Es werden die NMR‐ und IR‐Daten mitgeteilt. F3SiPH2 wird von HE(CF3)2 (E = P, As) nicht gespalten. während es mit JE(CF3)2 nach Gl.(2)
analog dem H3SiPH2 reagiert. Auf Grund geringerer Basizität des P‐Atoms im F3SiPH2 reagiert es langsamer als H3SiPH2. Die mit BCl3, BBr3, AlCl3 entstehenden Addukte sind weniger beständig als die des H3SiPH2. Demzufolge wird H3SiPH2 leichter gespalten als F3SiPH2.
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