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71.
Carsten von Hänisch PD Dr. 《无机化学与普通化学杂志》2008,634(1):23-29
The range of molecular silicon phosphorus compounds has been extended by some new species containing oligosilane ((R2Si)n; n ≥ 2) or oligosiloxane ((R2SiO)mSiR2; m ≥ 1) fragments bound to phosphorus atoms. Primary and secondary compounds of these types allow for the synthesis of metal derivatives. Such metalated species usually form oligomers and exhibit a versatile structural chemistry with cyclic, polycyclic, and cage‐like patterns. The main results obtained in the field of oligosilane‐ and oligosiloxane‐bridged phosphines will be presented below and the structures of the metal derivatives will be discussed. Moreover, the synthesis of an inorganic ligand on the basis of siloxane‐bridged phosphines will be presented. This compound opens up a new chapter in host‐guest chemistry. 相似文献
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75.
François P. Rotzinger PD Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2007,13(36):10298-10302
76.
Yingche Chen Kelvin Tsao Sydney L. Acton Prof. Jeffrey W. Keillor 《Angewandte Chemie (International ed. in English)》2018,57(38):12390-12394
We report the development of YC23, a novel green BODIPY‐based dimaleimide derivative that undergoes a fluorogenic addition reaction (FlARe) with a genetically encodable peptide tag (dC10α) that can be fused to a protein of interest (POI). We also demonstrate the application of this reaction for the fluorogenic labelling of a specific POI in bacterial lysate and in living mammalian cells. 相似文献
77.
Dr. Felix Anke Dr. Susanne Boye Dr. Anke Spannenberg Dr. Albena Lederer Prof. Dr. Detlef Heller PD Dr. Torsten Beweries 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(35):7889-7899
Dehydropolymerisation of methylamine borane (H3B⋅NMeH2) using the well-known iron amido complex [(PNP)Fe(H)(CO)] (PNP=N(CH2CH2PiPr2)2) ( 1 ) gives poly(aminoborane)s by a chain-growth mechanism. In toluene, rapid dehydrogenation of H3B⋅NMeH2 following first-order behaviour as a limiting case of a more general underlying Michaelis–Menten kinetics is observed, forming aminoborane H2B=NMeH, which selectively couples to give high-molecular-weight poly(aminoborane)s (H2BNMeH)n and only traces of borazine (HBNMe)3 by depolymerisation after full conversion. Based on a series of comparative experiments using structurally related Fe catalysts and dimethylamine borane (H3B⋅NMe2H) polymer formation is proposed to occur by nucleophilic chain growth as reported earlier computationally and experimentally. A silyl functionalised primary borane H3B⋅N(CH2SiMe3)H2 was studied in homo- and co-dehydropolymerisation reactions to give the first examples for Si containing poly(aminoborane)s. 相似文献
78.
Daunne Christa PD Dr. 《ZDM》2003,35(3):102-109
It is reported about a longitudinal study run at the Institute of Cognitive Mathematics of the University of Osnabrueck, in which pupils’ verbal and text productions from mathematics lessons at a grammar school are analysed by means of cognitive theoretical methods. First of all, a teaching scene from an instruction to probability calculus and further text productions from an introductory lesson about exponential functions are analysed, in which five pupils take part whose cognitive structures have been assessed and classified in individual examinations. The characteristics brought out according to these teaching scenes indicate different ideas and thinking processes of the pupils. The second part shows that the pupils’ behaviour described is not only to be regarded in isolation but it can also be found in longitudinal examinations and can therefore be considered as a stable, typical characteristic. These results lead to consequences for the planning and design of mathematics lessons based on a well-founded theory of cognition. 相似文献
79.
Journal of the Operational Research Society - 相似文献
80.
Rex Acton 《The Journal of the Operational Research Society》1960,11(4):263-264