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As a further test of the concept of regioexhaustive functionalization, 2-chloro-6-(trifluoromethyl)pyridine, 2-chloro-5-(trifluoromethyl)pyridine and 3-chloro-4-(trifluoromethyl)pyridine were each converted into the three possible carboxylic acids. This wa ...
Various catalysts were used in a systematical study of selective catechol methylation to 3-methylcatechol (I) in a fixed-bed reactor of 35-mm diam. and 16-cm length. Reaction products were analyzed by gas chromatog. with mass spectrometric detection. Alumi ...
Indenyllithium reacts with dichlorobis(dimethylamino)diborane(4) with formation of bis(dimethylamino)bis(1-indenyl)-diborane(4) which rearranges on heating to the isomer bis(dimethylamino)bis(3-indenyl)diborane(4). The mixed isomer bis(dimethylamino)(1-ind ...
The importance of catalysis in chemistry has not to be proved anymore. Be it homogeneous or heterogeneous catalysis, the constant progresses observed in that field proves its obvious interest. The asymmetric homogeneous catalysis is a method of choice to s ...
When two different periodic potentials are present at the same time in a solid, the electron wavefunctions must conform to the resulting overall periodicity. It is the case of the broken-symmetry phases which are often observed in low-dimensional systems. ...
Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2005
In the rearrangement of exo-2,10-dibromobornane to camphene it was demonstrated that even complex elimination processes which involve the breaking and making of several bonds can be brought about in a highly concerted fashion under variable push-pull contr ...
Applying a first-principles scheme to liquid GeSe4, we show that the charge-charge structure factor does not present any feature at the location of the first sharp diffraction peak (FSDP), despite a clear FSDP in the concentration-concentration structure f ...
A Dral restriction map of the approximately 4.35 Mb circular chromosome of the vaccine strain Mycobacterium bovis BCG Pasteur was constructed by linking all 21 Dral fragments, ranging in size from 6 to 820 kb, using specific clones that spanned the Dral re ...
The structure and absolute configuration of natural lentiginosine isolated from plant sources was determined to be (1S,2S,8aS)-1,2-dihydroxyindolizidine ((+)-4) on the basis of the synthesis of both enantiomers (+)-4 and (-)-4 and their inhibition of amylo ...
Biflavones I (R = Ph, 4-MeOC6H4) were prepd. from diketone II (R1 = Me, R2 = H) via rearrangement of II (R1 = Bz, 4-MeOC6H4CO, R2 = H) to II (R1 = H, R2 = Bz, 4-MeOC6H4CO). [on SciFinder (R)] ...
