3938-16-7Relevant articles and documents
Direct synthesis of 2,5-polychloro-1,2-epoxycyclopentane-1-carboxylic acids and their alkyl esters
Guirado, Antonio,Cerezo, Alfredo,López-Sánchez, José I.,Sáez-Ayala, Magalí,Bautista, Delia
, p. 7583 - 7585 (2006)
The treatment of 3,3,6,6-tetrachloro-1,2-cyclohexanedione with sodium hydroxide gave 2,5,5-trichloro-1,2-epoxycyclopentane-1-carboxylic acid in almost quantitative yield. 3,6,6-Trichloro-2-hydroxy-2-cyclohexen-1-one was also found to be able to undergo a
A Simple Method for the Preparation of Dichlorocatechols.
Kirsch, Nils H.,Stan, H.-J.
, p. 131 - 138 (2007/10/03)
Dichlorocatechols (DCC) are common metabolites in the aerobic degradation of dichlorobenzenes. Their synthesis is therefore possible either enzymatically, or chemically by several two-step-synthesis starting from cycloalkanones or suitable dichlorophenols. A modified ultrasonic Reimer/Tiemann reaction and subsequent Dakin oxidation was used to prepare 3,5-DCC and 4,5-DCC. A new UV-photoradical single step synthesis of 3,4-dichlorocatechol as well as 3,6-dichlorocatechol is described in detail. Mass spectral and 13C-NMR spectral data of all four dichlorocatechol isomers are presented.
Reactions of polar dienes with o-quinones
Paquet, Jacques,Brassard, Paul
, p. 1354 - 1358 (2007/10/02)
The behaviour of various types of polar dienes towards halogenated ortho quinones has been investigated in a number of representative cases.As compared to the commonly used para analogues, o-quinones provide a wide range of products that indicate a keener response to the nature, number, and position of substituents on both reactants. 3-Halogenated-o-naphthoquinones 1 and 2 react smoothly with a representative vinologous ketene acetal 3, vinylketene acetals 4 and 5, and a monooxygenated diene 6 to provide variously substituted phenanthrenequinones 7-11.Only monooxygenated dienes on the other hand add to o-benzoquinones 14-16 and give convenient syntheses of the corresponding o-naphthoquinones 18-20.Key words: cycloaddition, o-naphthoquinones, phenanthrenequinones, regiospecificity.