A carbon-13 and nitrogen-15 isotopic labelling study of intermediates and by-products in the reaction of chalcone and phenylhydrazine to give 1,3,5-triphenyl-2-pyrazoline
作者:Peter W Kenny、Michael J.T Robinson
DOI:10.1016/s0040-4039(00)85452-0
日期:1986.1
The formation of 1,3,5-triphenyl-2-pyrazoline 7 from chalcone and phenylhydrazine 1,4-addition followed by an allowed 5-endo-trig cyclisation has been demonstrated by 13C and 15N labelling in time resolved 13C NMR spectroscopy.
由查尔酮和苯肼1,4-加成反应形成1,3,5-三苯基-2-吡唑啉7,随后允许的5-内-trig环化反应已通过13 C和15 N标记及时地13 C NMR证实光谱学。