Le laurate de nitro-4 phenyle dans l'eau forme des agregats dans lesquels les groupes esters s'hydrolysent lentement. Des sels, de formule generale RN(CH 3 ) 3 + X − rompent ou detruisent les agregats. Les groupes esters sont alors deproteges et les vitesses d'hydrolyse observees croissent. L'importance de l'accroissement de vitesse depend de R
Le laurate de nitro-4 phenyle dans l'eau forme des agregats dans lesquels les groupesesters s'hydrolysent lentement。Desels, deformule generale RN(CH 3 ) 3 + X − rompent ou detruisent les agregats。Les groupesesters sont alors deproteges et les vitesses d'hydrolyse 观察羊角面包。L'importance de l'accroissement de vitesse depends de R
Ditopic crown ether–guanidinium ion receptors for the molecular recognition of amino acids and small peptides
作者:Andreas Späth、Burkhard König
DOI:10.1016/j.tet.2010.01.028
日期:2010.3
A series of ditopic synthetic receptors based on a crown ether–guanidinium ion recognition motif is reported. The compounds show binding affinity to selected amino acids, including important neurotransmitters. The effect of the distance of the ammonium and the carboxylate ion, the rigidity of the spacer, and the use of pre-organized pyrrole– and pyrene–guanidinium groups on binding affinity and selectivity
pH Influenced molecular switching with micelle bound cavitands
作者:Yeon Joo Kim、Mark T. Lek、Michael P. Schramm
DOI:10.1039/c1cc12901e
日期:——
A series of resorcinarene host–amphiphilic guest complexes have been developed where guest orientation in the host is drastically influenced by pH. Guests appended with a trimethylammonium and a tert-butyl group switch orientation by 180° in response to a buildup of negative charge in the cavitand host.
Porpholactones and their derivatives have attracted increasing attention for their promising application as photosensitizers. Reduction of the β‐lactone moiety in porpholactone to β‐hemiacetal, named porpholactol, allows the synthesis of chlorin‐typephotosensitizers with enhanced near‐infrared absorption as well as β functionalization of water‐soluble conjugates. By employing β‐hydrophilic conjugates
Cyclotrimerization of phenylacetylene catalyzed by a cobalt half-sandwich complex embedded in an engineered variant of transmembrane protein FhuA
作者:A. Thiel、D. F. Sauer、M. A. S. Mertens、T. Polen、H.-H. Chen、U. Schwaneberg、J. Okuda
DOI:10.1039/c8ob01369a
日期:——
An (η5-cyclopentadienyl)cobalt(I) complex was covalently incorporated into an engineered variant of the transmembrane protein ferric hydroxamate uptake protein component: A, FhuA ΔCVFtev, using a thiol–ene reaction. A CD spectrum shows the structural integrity of the biohybrid catalyst. MALDI-TOF of the segment containing the anchoring site for the cobalt complex Cys545 confirmed successful conjugation