Mass spectrometric study of some 2,3-diaryl-1,3-thiazolidin-4-ones under electron impact
作者:C. R. J. Woolston、J. B. Lee、F. J. Swinbourne
DOI:10.1002/oms.1210280430
日期:1993.4
AbstractThe mass spectral fragmentations of some 2,3‐diaryl‐1,3‐thiazolidin‐4‐ones were established by comparing spectra and by using exact mass measurements. The major fragment ions were identified and their relative importances related to substituent effects and bond strengths. Good correlations were observed between the relative abundances of some of the breakdown products and the Hammett σ constants of substituents in the aromatic rings.
A PRELIMINARY STUDY ON PREDICTING THE 13C CHEMICAL SHIFTS FOR A SERIES OF DISUBSTITUTED 2,3-DIPHENYL-1,3-THIAZOLIDIN-4-ONES
作者:John Tierney、Douglas Sheridan、Linda Mascavage、Daniela Gorbecheva、Michelle Ripp、Sonjoo Son
DOI:10.1515/hc.2005.11.3-4.215
日期:2005.1
the 2,3-diphenyl-l,3-thiazolidin4-one system affect the electron density surrounding the C-2, C-4 and C-5 atoms. These changes are reflected iη the different nmr chemical shifts for these carbonatoms relative to the unsubstituted compound. The C chemical shifts for the C-2, C-4 and C-5 carbons of these compounds have previously been shown to correlate with Hammett σ constants and Swain Lupton dual
已成功尝试预测一系列二取代的 2,3-二苯基-1,3thiazolidin-4-one 的 C 化学位移。先前的工作表明,放置在 2,3-二苯基-1,3-噻唑烷 4-one 系统的任一苯环上的取代基会影响 C-2、C-4 和 C-5 原子周围的电子密度。这些变化反映在这些碳原子相对于未取代化合物的不同核磁共振化学位移中。这些化合物的 C-2、C-4 和 C-5 碳的 C 化学位移先前已被证明与 Hammett σ 常数和 Swain Lupton 双取代基参数相关。由于这些相关性,我们决定基于两个单取代系列化合物的已知位移来研究预测噻唑烷酮环中 C-2、C4 和 C-5 的 C 化学位移的潜力。取代基对二取代 2,3-二苯基噻唑烷酮中 C-2、C-4 和 C-5 碳的 C 化学位移的影响相对于两个单取代的 2,3-二苯基噻唑烷酮系列进行了讨论。然后使用该数据预测噻唑烷酮环中 C-2、C-4