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Flash vacuum pyrolysis of 2- and 3-thenyl benzoates (4 and 5, respectively) at temperatures in the range 550–750 °C and ca. 10 −2 torr gave several radical-derived products. The mechanism of formation of these pyrolysis products is proposed to involve 2-, 3-thenyl and phenyl radicals.
Cyclohexanone is readily oxidized to adipic, α,α - dichloroadipic, glutaric and succinic acids by sodium hypochlorite under phase transfer conditions. The selectivity is highly dependent on the pH of the reacting system. A consecutive chlorination-hydrolysis mechanism is proposed in which only...
A general method for the phosphonyl C 2 ,C 3 C bond formation under the free radical, reductive conditions is described. The new approach is based on the synthesis of novel 2- and 3- phosphonyl radicals 6, 9 derived from the corresponding 2- and 3-halo (XCl, Br, I) substituted phosphonates...
Binding to a variety of natural and synthetic DNAs by cationic water-soluble porphyrins - having three N-methylpyridynium and one amino-acid derivatized phenyl ring as meso substituents - has been investigated. These studies indicate that amino acid porphyrin derivatives are able to intercalate...
The activation of the conjugate addition of amines to α,β-ethylenic substrates is considered. Pressure (physical parameter) is a powerful tool to promote the reaction due to its effect on the nucleophilic attack on the double bond of the acrylic compound with development of zwitterionic...
In order to obtain molecules that can bind to specific DNA-sequences, several new tri-(N-methyl-4-pyridiniumyl)porphyrins bearing an amino acid or peptide side-chain on the fourth meso aromatic substituent have been synthesized by efficient coupling of a monofunctionalized porphyrin with amino...
The poison gland secretion of the African ant, Myrmicaria opaciventris , contains three families of new alkaloids. These alkaloids are represented by a “monomeric” type with 15 carbon atoms in a row forming derivatives of indolizines, while the two other families are “dimers” and...
An efficient and simple method is introduced for the selective removal of methyl group from poly aryl-methyl ethers, in some important derivatives of benzophenones, xanthones, anthraquinones, aryl esters, benzamides and nitroanisoles with BeCl 2 .
Thermal and acid-catalysed sigmatropic rearrangements of 4-(N-methyl-N-allylamino)-5-methoxy-1,2-benzoquinones 3 and of 4-(2-vinyl-aziridino or azetidino)-5-methoxy-1,2-benzoquinones 7 were studied and compared. The mechanisms of these reactions are discussed.
An effective imide formation method is presented, which allows the preparation of β,γ-unsaturated N -acyl-2-oxazolidinones with high yields and without isomerization of the double bond to give the α,β-unsaturated isomers, which are the inevitable by-products when alternative procedures are used.
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