Coustard,J.-M.; Jacquesy,J.-C., Bulletin de la Societe Chimique de France, 1973, p. 2098 - 2101
作者:Coustard,J.-M.、Jacquesy,J.-C.
DOI:——
日期:——
The Photochemistry of Conformationally Rigid Benzylic Esters: 2,2-Dimethyl-1-indanyl Acetates and Pivalates
作者:J. A. Pincock、P. J. Wedge
DOI:10.1021/jo00118a024
日期:1995.6
The photochemistry, in methanol, of substituted 2,2-dimethyl-1-indanyl acetates 9a-c and pivalates 10a-c has been studied. In agreement with previous studies on benzylic esters, the results show that the substituents change the yield of products derived from the ion pair. The mechanistic conclusion reached is that the substituents change the oxidation potential of the indanyl radicals and thus the rate constant of electron transfer for converting the radical pair to the ion pair. The results also reveal two other substituent effects. First, substituents can increase the overall efficiency of the photoreaction by enhancing homolytic cleavage, The second effect is conformational. In compounds where the bond that is cleaving is conformationally mobile, such as the C-O bond in benzylic esters, substituents on the ring can change the population of the reactive conformer and thus the overall efficiency of the reaction. For the indanyl acetate esters, the difference in excited-state reaction rate between the m- and p-methoxy substituted ester is 15:1. For the m- and p-methoxy substituted benzyl acetates, this difference in reaction rate is 48:1. The larger difference in reaction rate for the conformationally mobile benzylic esters is attributed to a higher population of the unreactive conformer for the p-methoxy substituted ester.
BENZOCYCLOALKENE COMPOUNDS, THEIR PRODUCTION AND USE
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0781271A1
公开(公告)日:1997-07-02
[EN] BENZOCYCLOALKENE COMPOUNDS, THEIR PRODUCTION AND USE<br/>[FR] COMPOSES BENZOCYCLOALCENES, LEUR PRODUCTION ET LEUR UTILISATION
申请人:TAKEDA CHEMICAL INDUSTRIES, LTD.
公开号:WO1996008466A1
公开(公告)日:1996-03-21
(EN) A compound of formula (I) wherein R1 and R2 are H, a hydrocarbon group or a heterocyclic group, or R1 and R2 are combinedly a spiro ring; R3 is a hydrocarbon group, a substituted amino group, a substituted hydroxyl group or a heterocyclic group; R4 is H or alkyl; ring A is a substituted benzene ring; m and n denote 1 to 4; ......... means a single or double bond or a salt, a process of producing thereof and a composition having a binding affinity for melatonin receptor.(FR) Composés de la formule (I) dans laquelle R1 et R2 sont H, un groupe hydrocarbure ou un groupe hétérocyclique, ou bien sont combinés en une liaison spiro; R3 est un groupe hydrocarbure, un groupe amino substitué, un groupe hydroxyle ou un groupe hétérocyclique substitué; R4 est H ou un alkyle; la liaison A est une liaison benzène substituée; m et n sont des nombres allant de 1 à 4; ......... exprime une liaison simple ou double ou un sel. L'invention porte également sur le procédé d'obtention d'un tel composé et sur une composition présentant une affinité de liaison pour le récepteur de mélatonine.