The purposes of this study were to develop the Chinese-version betel quid dependence instrument (BQDI) and to test its reliability and validity. An item pool relevant to betel quid dependence was generated. A panel of three experts assessed content validity
The Journal of organic chemistry, 71(24), 9178-9182 (2006-11-18)
Enantiomeric discrimination is observed in the (1)H and (13)C NMR spectra of piperidines and piperazines in the presence of (-)-(18-crown-6)-2,3,11,12-tetracarboxylic acid. The amines are protonated by the carboxylic acid groups of the crown ether to produce the corresponding ammonium and
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