cis-3,4-bis[(E)-1-butenyl]tetrahydro-2-furanol, the pheromone of theBiprorulus bibax, was synthesized by the iridium catalyzed oxidative lactonization.
The first Oppenauer oxidation of primary alcohols with acetone or 2-butanone by an amino alcohol-based Ir bifunctional catalyst was accomplished. The reaction proceeds with 1 mol % catalyst in acetone or 2-butanone at 30-80 degrees C to give the corresponding aldehydes in 33-96% yield.
The aim of this study is to show directly, by an elaborated chemical etching technique, some regular arrangements of dislocations, all or nearly all of which form the predicted planer networks in F.C.C. metals. The composition of the etching reagent used here was as follows: methyl alcohol, 25∼50 cc; hydrochloric acid,32 cc; nitric acid, 50 cc; and hydrofluoric acid, 2 cc; (a modification of the one devised by Lacombe and Beaujard. (1947),). The etchpit networks could be detected on the surface of Al single crystals, although not decisively. Their regularity was much worse than that of Al-alloys (described in the 2nd report). The mean spacing between etchpits is 1∼3 μ, and the mean size of hexagonal sub-structure, if any, gives about 10 to 20 μ in linear dimension. A domain composed of the same scheme of the sub-structure seems to extend to 50∼100 μ. The density of etchpits thus obtained is the order of 106 cm−2. In the 1st report, the preliminary consideration and the results obtained from the observation of Al single crystals are discussed.
The asymmetric fluorination of β-keto carbonyl compounds has attracted interest due to the enhanced pharmaceutical activity of F-containing compounds. Here, the enantioselective electrophilic fluorination of aryl acetic acid derivatives is reported and can afford after cleavage of the thiooxazolidinone moiety chiral α-monofluorinated carboxylic acids without loss of stereochemical information (see reviews below).
We show that N,N-dimethylformamide-stabilized Pd nanoclusters (NCs) have high catalytic activity in the reaction of substituted 2-iodoanilines with alkynes to give 2,3-disubstituted indoles. This indole synthesis does not require phosphine ligands and proceeds with low Pd catalyst loadings. The Pd NCs were separated from the mixture after the reaction, and recycled at least three times. Transmission electron microscopy images showed that the Pd particle size before the reaction was 1.5-2.5 nm. The particle size after the reaction was 2-3 nm. X-ray photoelectron spectroscopy showed that the binding energy of the Pd NCs before the reaction was 335.0 eV.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
