• Bulletin of the Korean Chemical Society
• /
• v.26 no.9
• /
• pp.1331-1332
• /
• 2005

• Bulletin of the Korean Chemical Society
• /
• v.32 no.4
• /
• pp.1179-1182
• /
• 2011

In the present work, successful implementation of ultrasound irradiations for the rapid synthesis of 1,5-benzodiazepine derivatives under solvent-free conditions is demonstrated. Use of a novel catalyst i.e. camphor sulphonic acid in combination with ultrasound technique is reported for the first time. Comparative study for the synthesis of 1,5-benzodiazepines using conventional as well as ultrasonication method is discussed.

• Bulletin of the Korean Chemical Society
• /
• v.32 no.12
• /
• pp.4297-4303
• /
• 2011

Under solvent-free conditions, the synthesis of propargylic alcohols by direct addition of terminal alkynes to aldehydes promoted by ZnO as a novel, commercially, and cheap catalyst is described. Furthermore, the catalyst can be reused for several times without any significant loss of its catalytic activity.

• Journal of the Korean Chemical Society
• /
• v.52 no.4
• /
• pp.369-379
• /
• 2008

• Journal of the Korean Chemical Society
• /
• v.54 no.6
• /
• pp.723-726
• /
• 2010

An efficient and simplified protocol for $NaHSO_4/SiO_2$ catalyzed solvent-free synthesis of $\beta$-enaminone and 2-methylquinolin-4(1H)-one derivatives under microwave irradiation is described. A series of functionalized derivatives have been synthesized in shorter reaction times with moderate to good yields. The use of milder catalyst in non-conventional method offers significant advantages over conventional methods, such as higher selectivities, simplicity, solvent-free reaction and non-environmental polluting conditions.

• Journal of the Korean Chemical Society
• /
• v.52 no.1
• /
• pp.52-56
• /
• 2008

facile and efficient method for the preparation of Z-aldoximes is improved by means of H3PMo12O40 catalyst in solvent-free media. The major advantages of this method are: operational simplicity, low catalyst loading, selectivity, mild reaction conditions, short reaction times and excellent yields. The recovered catalyst could be used in new attempts without any purification.

• Bulletin of the Korean Chemical Society
• /
• v.34 no.10
• /
• pp.2963-2967
• /
• 2013

This paper describes a simple and efficient method involving domino Knovenegal/$6{\pi}$ electrocyclization for the preparation of a variety of 2H-pyrans using microwave irradiation under solvent- and catalyst-free conditions. This method offers the advantages of a green approach, high yields, and short reaction times. Sixteen compounds (9a-p) were obtained in good to excellent yields using the procedure.

• Bulletin of the Korean Chemical Society
• /
• v.32 no.11
• /
• pp.4001-4004
• /
• 2011

Various 5-substituted 1H-tetrazole derivatives were synthesized in a simple and environmentally benign method from the reaction of aryl and benzyl nitriles with sodium azide in solvent-free media using montmorillonite K-10 clay as solid recyclable heterogeneous acidic catalyst and microwave irradiation in good yields and short reaction times.

• Journal of the Korean Chemical Society
• /
• v.57 no.5
• /
• pp.599-605
• /
• 2013

Some N-acetyl pyrazoles including 1-(3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-$^1H$-pyrazole- 1-yl) ethanones have been synthesised by solvent free cyclization cum acetylation of chalcones like substituted styryl 3,4- dichlorophenyl ketones using hydrazine hydrate and acetic anhydride in presence of catalytic amount of fly-ash: $H_2SO_4$ catalyst. The yield of these N-acetyl pyrazole derivatives are more than 75%. The synthesised N-acetyl pyrazoline derivatives were characterized by their physical constants and spectral data.

• Bulletin of the Korean Chemical Society
• /
• v.25 no.8
• /
• pp.1117-1118
• /
• 2004