关于通过将市售单体与五硫化二磷(P 4 S 10)反应,一步合成聚(异硫杂萘)(PITN)的反应的机理研究,就产生了一种合成链终止分子的想法,该链终止分子应产生适用于PITN的醌型模型化合物。在这种情况下,选择苄基二硫代邻苯二甲酰和戊二烯二硫代邻苯二甲酸酯作为靶分子。报道了苄二烯二噻吩和戊二烯二噻吩的合成中意想不到的重排和这些重排的控制。
关于通过将市售单体与五硫化二磷(P 4 S 10)反应,一步合成聚(异硫杂萘)(PITN)的反应的机理研究,就产生了一种合成链终止分子的想法,该链终止分子应产生适用于PITN的醌型模型化合物。在这种情况下,选择苄基二硫代邻苯二甲酰和戊二烯二硫代邻苯二甲酸酯作为靶分子。报道了苄二烯二噻吩和戊二烯二噻吩的合成中意想不到的重排和这些重排的控制。
Magnesium hemithioacetates were used as model cysteine compounds to mimic natural hemithioacetals, and their biomimetic oxidation reactions using a model NAD+ compound were investigated. Cyclic hemithioacetate was found to be the best substrate for the reaction with the model NAD+ compound, which gave the corresponding NADH analog in excellent yield.
Protiva,M. et al., Collection of Czechoslovak Chemical Communications, 1964, vol. 29, p. 2161 - 2181
作者:Protiva,M. et al.
DOI:——
日期:——
The Hydrolysis of Phthalide, Thiophthalide, and Methyl o-Methoxybenzoate in Highly Alkaline Media. Curvature in the khyd vs [OH-] Profile
作者:B. A. Kellogg、R. S. Brown、R. S. McDonald
DOI:10.1021/jo00095a047
日期:1994.8
The hydrolyses bf phthalide (2a) and thiophthalide (3) have been studied in highly alkaline media, T = 25 degrees C, mu = 3 (KCl). For both esters, an upward curvature in the plot of k(hyd) vs [OH-] is observed, suggestive of the onset of a second order in [OH-] process in the hydrolysis. Carbonyl O-18-exchange studies indicated that no O-18 is lost from the ester recovered from the hydrolysis media at times up to 3t(1/2) hydrolysis. Solvent kinetic Isotope (skie) studies indicate that for 3, (k(hyd))(H2O/D2O) is inverse throughout the entire range of [OL(-)]. The lack of O-18-exchange and the inverse nature of the skie on k(hyd) suggest that the curvature in the k(hyd) VS [OH-] plots is not due to the involvement of two hydroxides in the hydrolytic process. A correlation of the k(hyd) data with the acidity function H-- appropriate for highly alkaline media is linear and suggests the involvement of a single hydroxide throughout the entire [OH-] range. A reinvestigation of the alkaline hydrolysis of methyl o-methoxybenzoate (4) accompanied by O-18-exchange studies failed to detect unambiguous evidence for a bona fide second order in [OH-] process.
McDonald, Robert S.; Patterson, Patricia; Stevens-Whalley, Ann, Canadian Journal of Chemistry, 1983, vol. 61, p. 1846 - 1852
作者:McDonald, Robert S.、Patterson, Patricia、Stevens-Whalley, Ann
DOI:——
日期:——
Majumdar, Gita; Mal, Dipakranjan, Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1994, vol. 33, # 7, p. 700 - 702