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Now showing items 3311-3320 of 3352
Organocatalyzed Tsuji-Trost reaction: a new method for the closure of five- and six-membered rings
(Oxford : Pergamon-Elsevier Science Ltd, 2009)
A combination of organotransition metal catalysis and organocatalysis allows for Tsuji-Trost 5-exo- and 6-exo-cyclizations of aldehydes. This transformation can also be accomplished as a catalytic asymmetric reaction, which ...
Alkylation of carbonyl compounds in the TiCl4-promoted reaction of trimethylsilyl enol ethers with epoxides
(Oxford : Pergamon-Elsevier Science Ltd, 2001)
Titanium tetrachloride promoted reaction of trimethylsilyl enol ethers with ethylene oxide affords homoaldol type products in moderate/good yields. Monosubstituted epoxides react regioselectively: the nucleophilic attack ...
Synthesis of (-)-cytoxazone and (+)-epi-cytoxazone: The chiral pool approach
(Taylor & Francis, 2005)
Immunomodulator (-)-cytoxazone and its epimer (+)-epi-cytoxazone were synthesized starting from (D)-(-)-4-hydroxyphenylglycine. Homologation of the amino acid was achieved via the corresponding aldehyde, by a cyanohydrin ...
An efficient semisynthesis of 7-deoxypaclitaxel from taxine
(Journal of the Chemical Society, Perkin Transactions 1, 2000)
A semisynthesis of 7-deoxypaclitaxel 4 is described, starting from taxine 6 - the most abundant naturally occurring taxane diterpene fraction. A key step in this transformation is a tandem reaction: stereoselective osmylation ...
Cyclization Reactions of Oxyallyl Cation. A Method for Cyclopentane Ring Formation
(American Chemical Society (ACS), 2019)
Unsaturated oxyallyl cations with a suitably positioned alkene bond undergo 5-exo-cyclization with the formation of vinylcyclopentane derivatives. Alkyne analogues provide allenes. The reaction proceeds with a moderate to ...
Izoforme eksterne invertaze kvasca Saccharomyces cerevisiae
(Универзитет у Београду, Хемијски факултет, 2010)
Četiri izoforme eksterne invertaze (EINV1, EINV2, EINV3 i EINV4) iz kvasca S. cerevisiae izolovane su izoelektričnim i etanolnim taloženjem, jonoizmenjivačkom hromatografijom na različitim QAE kolonama i gel hromatografijom. ...
Decomposition rate of octadecylamine (ODA)
(Belgrade : Society of Thermal Engineers of Serbia, 2021)
Film forming amines (FFA) are organic additives used to prevent corrosion in power plant water/steam cycle. FFA create a non-wettable film on the inner tube wall that represents a physical barrier between the tube wall and ...
Analytical Methods for Determination of Film Forming Amine Concentration in Water Solutions
(The International Association for the Properties of Water and Steam (IAPWS), 2023)
This work presents analytical methods for measuring the concentration of film forming amines. Their advantages and disadvantages are discussed. Special attention is paid to the applicability of each method in power industry.
Advances in Studies of Film Forming Amines under Steam Generator Conditions
(The International Association for the Properties of Water and Steam, 2022)
Factors influencing thermal stability of film forming amines (FFA) in water/steam cycle conditions (such as temperature and residence time) are considered in this work. The thermal stability of FFA and the impact of their ...
Gold(I)-Catalyzed Domino Cyclizations of Diynes for the Synthesis of Functionalized Cyclohexenone Derivatives. Total Synthesis of (-)-Gabosine H and (-)-6-epi-Gabosine H
(American Chemical Society (ACS), 2016)
1,6-Diynes with a t-butylcarbonate group in the propargylic position undergo gold(I)-catalyzed dominocyclization which affords alpha-hydroxycyclohexenones. The described sequence can be applied on functionalized, highly ...