ChemInform Abstract: A New Method for the Preparation of 1,3,5‐Triarylbenzenes Catalyzed by Nanoclinoptilolite/HDTMA.

Abstract

Cyclotrimerization of ketones [(I) and (III)] leading to triarylbenzenes (II) or substituted benzenes like (IV), resp., is accomplished using nanozeolite surface modified by hexadecyltrimethylammonium bromide as recyclable catalyst.

Environmentally friendly and highly efficient synthesis of benzoxazepine and malonamide derivatives using HPA/TPI‐Fe3O4 nanoparticles as recoverable catalyst in aqueous media

“…The crystallinity of H 6 P 2 W 18 O 62 /TPI‐Fe 3 O 4 NPs was investigated by XRD method . The positions and relative intensities of all diffraction peaks match well with those from the JCPDS card (75–1610).…”

“…The FT‐IR spectrum of H 6 P 2 W 18 O 62 /TPI‐Fe 3 O 4 NPs has a distinct band with shoulders at about 1035 cm −1 , confirming a strong interaction of the pyridine‐modified Fe 3 O 4 NPs with H 6 P 2 W 18 O 62 . In addition, observation of the fingerprinting FT‐IR bands of the Wells–Dawson structure in the 750–1010 cm −1 region confirms the loading of H 6 P 2 W 18 O 62 onto the surface of TPI‐Fe 3 O 4 NPs (Figure ) …”

“…As can be seen in TGA curve, the 3% decrease of mass of the catalyst from 200 to 500°C is related to the modification by TPI on the sorbent. Also, the prepared HPA/TPI‐Fe 3 O 4 NPs are stable up to 200°C …”

“…HPA/TPI‐Fe 3 O 4 NPs was synthesized according to a previously reported procedure . The immobilization of H 6 P 2 W 18 O 62 ⋅24H 2 O onto the TPI‐Fe 3 O 4 NPs was done in methanol solution (100 ml) containing 0.6 g of H 6 P 2 W 18 O 62 ⋅24H 2 O and TPI‐Fe 3 O 4 NPs (1.2 g), and the mixture was refluxed for 3 h. Then, the heterogeneous catalyst was collected and extracted in a Soxhlet extractor using methanol for 12 h and thereafter was dried at 105°C at reduced pressure.…”