Bismuth(III) trifluoromethanesulfonate tetrahydrate is found to efficiently catalyze the cyclotrimerization of acetophenones into 1,3,5-triarylbenzenes in good yields.
Mesoporous Pd‐MCM‐41 catalyzed expeditious synthesis of 1,3,5‐triarylbenzenes and 4‐aryl‐NH‐1,2,3‐triazoles have been developed via denitrative cyclo‐trimerization of β‐nitrostyrenes and de‐nitrative [3+2] cycloaddition of β‐nitrostyrenes with TMSN3 respectively. The catalyst was reused at least up to eight times with minimum loss of catalytic activity.
Electrophotographic recording material containing a trisazo dye
申请人:AGFA-GEVAERT
naamloze vennootschap
公开号:EP0350984A1
公开(公告)日:1990-01-17
An electrophotographic recording material comprising a conductive support and a photosensitive layer containing a photoconductive compound that has p-type charge generating capacity and is a trisazo compound which is the reaction product of the coupling reaction between a coupler compound that does not contain a carboxylic acid or sulphonic acid group and a diazonium salt represented by the following general formula (I) :
wherein :
each of L, M and Y (same or different) represents a phenylene group including a phenylene groups substituted with one or more substituents selected from the group consisting of lower alkyl (C₁-C₂), nitro, methoxy, ethoxy or halogen, or represents said phenylene group fused-on with the necessary atoms to close a saturated or unsaturated carbocyclic or heterocyclic ring or ring system including said ring or ring-system in substituted form, and
X⁻ is an anion.
Highly Efficient Synthesis of Substituted Benzenes in the Presence of B(HSO<sub>4</sub>)<sub>3</sub>as a New and Reusable Catalyst Under Solvent-Free Conditions
A highly efficient and simple procedure for the synthesis of substituted benzenes is described. A broad range of ketones (alkyl-aryl ketones and cyclic ketones) were condensed via a cyclotrimerization reaction in the presence of catalytic amounts of boron sulfonic acid [B(HSO4)(3)], a new, highly efficient, and reusable catalyst, under solvent-free conditions. All reactions completed in short times without formation of any by-products. The catalyst was recovered and reused successfully for 15cycles of the reaction. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.