期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 76, 期 1, 页码 301-304出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo101850g
关键词
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资金
- Office of Naval Research [N00014-08-1-0729]
- National Science Foundation [CHE-0645563]
- Robert A. Welch Foundation [F-1621]
Using stopped flow and other spectroscopic techniques, the thermodynamic parameters of the coupling reaction between 1,3-dimesitylimidazolylidene and phenyl isothiocyanate were determined (H degrees = 96.1 kJ mol(-1) and Delta S degrees = 39.6 J mol(-1) K-1). On the basis of these data which indicated that the reaction was reversible (K-eq = 5.94 x 10(14) M-1 at 25 degrees C; k(r) = 252 M-1 s(-1); k(r) = 4.24 x 10(-13) s(-1)), the adduct formed from the two aforementioned coupling partners was used as a latent catalyst to facilitate the [2 + 2 + 2] cyclotrimerization of phenyl isocyanate and the polymerization of DL-lactide.
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