Reactions of 2-[(Phenylthio)methylene]tetralin-1-thione
作者:Satoshi Moriyama、Shinichi Motoki
DOI:10.1246/bcsj.65.2056
日期:1992.8
afford the corresponding cycloadducts (2), from which thiophenol is eliminated by the treatment with sodium alkoxide to give the corresponding 2H-thiopyran derivatives (3). The cycloadducts 2 with styrene and indene do not undergo elimination. The reactions of thioketone 1 with cycloalkenones give both the cycloadducts and the elimination products, even in the absence of a base. The reactions of 1 with
2-Alkyl-5,6-dihydro-3-thioacetyl-2H-naphtho[1,2-b]thiopyrans (2) exist stably in the form of monomers at room temperature, whereas unsubstituented ones at the 2-position are apt to dimerize. Based on the X-ray analysis of (2g), UV spectral study of (2), and on semi-empirical calculations, this difference of the stability could be rationalized mainly by steric reason around the heterodiene C=C–C=S system.
2-烷基-5,6-二氢-3-硫代乙酰基-2H-萘并[1,2-b]硫代吡喃(2)在室温下以单体形式稳定存在,而在 2 位上未被取代的则容易发生二聚。根据 (2g) 的 X 射线分析、(2) 的紫外光谱研究和半经验计算,这种稳定性差异主要是由于杂二烯 C=C-C=S 系统周围的立体原因造成的。