A terminal alkyne-assisted
protocol for the one-pot formation of
a diverse range of arylamidines from a novel cascade reaction of in
situ generated nitrile oxides, sulfonyl azides, terminal alkynes,
and water by [3 + 2] cycloaddition and ring opening sequence was developed.
The use of aryl oxime chlorides as the carbon source of the amidine
group and the addition of water proved to be critical for the reaction.
Moreover, terminal alkynes, which can lead to high yields of products
by employing a less amount, may play a catalytic role in the reaction.
A broader range of substrates was investigated.
The hydrolysis of poly(ethylene terephthalate) (PET) obtained from waste bottles was studied. The dual functional phase transfer catalyst [(CH 3 ) 3 N(C 16 H 33 )] 3 [PW 12 O 40 ] exhibited outstanding catalytic activity to the hydrolysis of PET. Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy were used to confirm the main product terephthalic acid (TPA) of hydrolysis. The effects of temperature, time, particle size of PET and dosage of catalyst on hydrolysis reaction were examined. Under the optimum conditions of reaction temperature 145 C, time 2 h, particle size of PET at 0.5-1 mm and dosage of catalyst at 7 wt %, the conversion of PET and the yield of TPA were almost 100% and 93%, respectively. After easily separated from the product, the catalyst could be reused more than three times without obvious decrease in the conversion of PET and yield of TPA. An economical and convenient process was developed for hydrolysis of PET.
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