Die α‐Methylen‐γ‐butyrolactone 1‐28 wurden auf molluskizide Wirkung gegen Biomphalaria glabrata untersucht. Die racem. Verbindung 25 ist am wirksamsten. Die Synthese erfolgte durch modifizierte Reformatzky‐Reaktion aus den entspr. Carbonylverbindungen und Brommethylacrylsäureethylester. 7‐10, 17 und 22‐27 wurden erstmalig synthetisiert.
Achieving Vinylic Selectivity in Mizoroki-Heck Reaction of Cyclic Olefins
作者:Xiaojin Wu、Yunpeng Lu、Hajime Hirao、Jianrong Steve Zhou
DOI:10.1002/chem.201204427
日期:2013.5.3
In Heck reactions of cyclicolefins, the products usually have aryl groups that end up at the allylic and/or homoallylic position. We herein report new selectivity that adds aryl groups to the vinylic position. Cyclicolefins of various ring size worked well. The desired isomers were produced by palladium–hydride‐catalyzed isomerization of the initial products. Thus, a specific catalyst must be used
Structural effects on the rates of formation and the stability of enols of cyclic benzyl ketones
作者:Sherif Eldin、Ralph M. Pollack、Dale L. Whalen
DOI:10.1021/ja00004a041
日期:1991.2
The acid dissociation constants (KaK), the keto-enol equilibrium constants (K& and the rate constants for enolization of the cyclic benzyl ketones 2-indanone (la), 2-tetralone (3,4-dihydro-2( 1H)-naphthalenone, lb) and 2-benzosuberone (3,4- benzo-3-cyclohepten-I-one, IC) were measured in aqueous solution at 25 "C. The rate constants for ketonization of the enols and the acid dissociation constants
Kinetic and Thermodynamic Stability of Naphthalene Oxide and Related Compounds. A Comparative Microcalorimetric and Computational (DFT) Study
作者:Peter Brandt、Zhi Sheng Jia、Alf Thibblin
DOI:10.1021/jo025953p
日期:2002.11.1
naphthalene 1,2-oxide (5) in highlyaqueous media to give naphthols has been measured by heat-flow microcalorimetry. The reaction enthalpy of this aromatization reaction was measured as DeltaH = -51.3 +/- 1.7 kcal mol(-)(1). The unexpectedly low reactivity of naphthalene oxide is suggested to be due to an unusually large thermodynamic stability. A crude estimate of the stabilization effect, approximately 1 kcal