SiO}_2}}\) nanoparticles (NPs) as an eco-friendly, efficient and reusable catalyst in the synthesis of 2,3-dihydro-1H-perimidines as well as tetraketones. For tetraketones syntheses, a simple tandem Knoevenagel condensation following Michael addition procedure is performed by the reaction between benzaldehydes and 5,5-dimethyl-1,3-cyclohexanediones under solvent-free condition using \(\hbox SiO}_2}}\)
CsF mediated rapid condensation of 1,3-cyclohexadione with aromatic aldehydes: Comparative study of conventional heating vs. ambient temperature
作者:Kamalakar P. Nandre、Vijay S. Patil、Sidhanath V. Bhosale
DOI:10.1016/j.cclet.2011.01.002
日期:2011.7
A mild, efficient and high yielding protocol for the synthesis of 2,2′-arylmethelene dicyclohexane-1,3-dione derivatives at room temperature and 9-aryl-1,8-dihydrooctahydroxanthene at conventional heating using cesium fluoride as a catalyst is reported. The major advantages of this reaction are excellent yield, very short reaction time and use of inexpensive catalyst.
A simple, environmentally friendly, tandem Knoevenagel condensation and Michael addition procedure is reported. The reactions between cyclic-13-diketones and a variety of aldehydes were carried out in water to afford tetraketones (64–99%). In this green synthetic protocol, the solvent water itself catalysed the reaction by hydrogen bonding, thus avoiding the use of any other catalysts to make the work up procedure easier.
different nitrogen-doped carbondots (NCDS) are investigated for the functionalization of carbonyl compounds. The surface amines of all the NCDs were comprehensively characterized, allowing a correlation between the structural features of the nanoparticles and their catalytic performances. The most active nano-aminocatalyst was used to drive organic reactions in aqueousmedia.
A polymer composition comprises a minor amount of a pro-degradant selected from essentially carbocyclic β-diketones and metal complexes thereof, e.g. 2,2′-methylene(1,3-cyclohexanedione) or its Mn(II) or Zn complex. A film of the composition may be used for the protection of seeds or seedlings at an agricultural or horticultural locus.