A series of aminosilanes (R 'HNbSiR: have been prepared. In case of bulky substituents R' the aminolysis of Ph^SiCb stops at the (R'HN)ClSiPh2 stage. Replacement of the Cl atom is achieved with LiNHR' which allows the synthesis of mixed bisaminosilanes (R'HN)(R"HN)SiPh2 . The X-ray structures of three of these compounds have been determined. There are no intermolecular N-H -N hydrogen bonds in ...

Carboxypeptidase S-1 from Penicillium janthinellum has been isolated by affinity chromatography and characterized. The enzyme activity is unusually stable in organic solvents, e.g. 80% methanol. The hydrolysis of peptide substrates is apparently dependent on three ionizable groups. One group, with pKa of 4.0-4.5, is a catalytically essential residue in its deprotonated form, and another group w...

Reaction conditions, temperature and pressure ranges, for various chemical recycling proc‐ esses of polyesters are sketched in Figure 1. So far, various recycling processes for polyesters have been investigated and developed, as reviewed by Paszun and Spychaj [1]: alcoholysis with methanol or ethanol, glycolysis with ethylene glycol or propylene glycol, alkali hydrolysis with sodium hydroxide, ...

Rotaxanes consisting of achiral axle and achiral ring components can possess supramolecular chirality due to their unique geometrical architectures. To synthesize such chiral rotaxanes, we adapted a prerotaxane method based on aminolysis of a metacyclophane type prerotaxane that had planar chirality, which is composed of an achiral stopper unit and a crown ether type ring component. The prerota...