The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Gunda I Georg - One of the best experts on this subject based on the ideXlab platform.
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preparation and three carbon two carbon cycloaddition of cyclopropenone 1 3 propanediol ketal 5 5 dicyano 4 phenyl 2 cyclopenten 1 one 1 3 propanediol ketal
Organic Syntheses, 2003Co-Authors: Dale L Boger, Christine E Brotherton, Gunda I GeorgAbstract:Preparation and three-carbon + two-carbon cycloaddition of cyclopropenone 1,3-propanediol ketal: 5,5-Dicyano-4-phenyl-2-cyclopenten-1-one 1,3-propanediol ketal intermediate: 2-(bromomethyl)-2-(chloromethyl)-1,3-dioxane intermediate: Cyclopropenone 1,3-propanediol ketal product: 5,5-dicyano-4-phenyl-2-cyclopenten-1-one 1,3-propanediol ketal Keywords: acetal (and Thioacetal) formation; alkylation, C-alkylation; annulation, carbocyclic-[3]; annulation, carbocyclic-[5]; cyclization, condensation; cyclization, cycloaddition; halogenation, bromination; halogenation, bromination; ring expansion reactions; potassium amide, preparation of; pressure reactions, use of resealable glass tubes
Dale L Boger - One of the best experts on this subject based on the ideXlab platform.
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preparation and three carbon two carbon cycloaddition of cyclopropenone 1 3 propanediol ketal 5 5 dicyano 4 phenyl 2 cyclopenten 1 one 1 3 propanediol ketal
Organic Syntheses, 2003Co-Authors: Dale L Boger, Christine E Brotherton, Gunda I GeorgAbstract:Preparation and three-carbon + two-carbon cycloaddition of cyclopropenone 1,3-propanediol ketal: 5,5-Dicyano-4-phenyl-2-cyclopenten-1-one 1,3-propanediol ketal intermediate: 2-(bromomethyl)-2-(chloromethyl)-1,3-dioxane intermediate: Cyclopropenone 1,3-propanediol ketal product: 5,5-dicyano-4-phenyl-2-cyclopenten-1-one 1,3-propanediol ketal Keywords: acetal (and Thioacetal) formation; alkylation, C-alkylation; annulation, carbocyclic-[3]; annulation, carbocyclic-[5]; cyclization, condensation; cyclization, cycloaddition; halogenation, bromination; halogenation, bromination; ring expansion reactions; potassium amide, preparation of; pressure reactions, use of resealable glass tubes
Elvira S. Batyeva - One of the best experts on this subject based on the ideXlab platform.
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influence of ultrasonic irradiation on the reactivity of tetraphosphorus decasulfide and 2 4 dithioxo 1 3 2λ5 4λ5 dithiadiphosphetanes
Phosphorus Sulfur and Silicon and The Related Elements, 1994Co-Authors: I S Nizamov, G. G. Garifzyanova, Elvira S. BatyevaAbstract:Abstract Ultrasonic irradiation leads to increased reaction rate and reduction in reaction temperature and time in the reactions of tetraphosphorus decasulfide and 2,4-bis(alkylthio- and 4-methoxyphenyl)-2,4-dithioxo-1,3,2λ5,4λ5-dithiadiphosphetanes with dialkyl disulfides, Thioacetals, acetals, bis(tributylstannyl)sulfide and tributyl(iso-butylthio)stannane and to increased yields of organothiophosphorus products.
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INFLUENCE OF IODINE ON THE REACTIVITY OF TETRAPHOSPHORUS TRISULFIDE IN ORGANIC REACTIONS
Phosphorus Sulfur and Silicon and the Related Elements, 1994Co-Authors: I S Nizamov, G. G. Garifzyanova, L. A. Al'metkina, G. G. Sergeenko, Elvira S. BatyevaAbstract:Abstract The reactivity of β-tetraphosphorus trisulfide is increased through involvement of elemental iodine in the reactions with dialkyl disulfides, Thioacetals and animals. The reactions of β-and α-diiodotetra-phosphorus trisulfides with disulfides, Thioacetals and aminals were studied. The proposed reaction mechanism is discussed.
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reactions of tetraphosphorus decasulfide and 2 4 bis alkylthio 2 4 dithioxo 1 3 2λ5 4λ5 dithiadiphosphetanes with disulfides and Thioacetals
Phosphorus Sulfur and Silicon and The Related Elements, 1993Co-Authors: I S Nizamov, G. G. Garifzyanova, Elvira S. Batyeva, Vladimir A. Alfonsov, Lyubov A Almetkina, A. N. PudovikAbstract:Abstract The reactions of tetraphosphorus decasulfide and 2,4-bis(4-alkylthio)-2,4-dithioxo-1,3,2λ5, 4λ5-dithiadiphosphetanes with disulfides and Thioacetals were studied. The reactions were found to give some novel organothiophosphorus compounds.
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TETRAPHOSPHORUS TRISULFIDE IN REACTIONS WITH ThioacetalS, AMINALS, SULFENAMIDES AND DISULFIDES. INFLUENCE OF AMINES AND BENZOYL PEROXIDE
Phosphorus Sulfur and Silicon and the Related Elements, 1991Co-Authors: I S Nizamov, Elvira S. Batyeva, Vladimir A. Alfonsov, Rashid Z. Musin, A. N. PudovikAbstract:Abstract The reactions of tetraphosphorus trisulfide with Thioacetals, aminals, sulfenamides and disulfides were studied. The reactions were found to give organothiophosphorus compounds and to be facilitated by organic amines and benzoyl peroxide.
Arnold E Ruoho - One of the best experts on this subject based on the ideXlab platform.
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efficient method for Thioacetalization of carbonyl compounds in the presence of a catalytic amount of benzyltriphenylphosphonium tribromide btptb under solvent free conditions
Synthetic Communications, 2008Co-Authors: Abdol R Hajipour, Seied Ali Pourmousavi, Arnold E RuohoAbstract:Abstract A variety of carbonyl compounds have been successfully converted to the corresponding Thioacetal derivatives in good to excellent yields on reaction of carbonyl compounds with 1,2-ethanedithiole, 1,3-propanedithiol, and ethylthiol in the presence of a catalytic amount of benzyltriphenylphosphonium tribromide (BTPTB) under solvent-free conditions. Some of the major advantages of this method are mild reaction conditions, high efficiency, and the compatibility with other reported methods. In addition, no bromination occurs at the double bond or α to the keto position or even in the aromatic ring under these experimental conditions.
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an efficient method for Thioacetalization of carbonyl compounds in the presence of a catalytic amount of benzyltriphenylphosphonium tribromide under solvent free conditions
Phosphorus Sulfur and Silicon and The Related Elements, 2007Co-Authors: Abdol R Hajipour, Seied Ali Pourmousavi, Arnold E RuohoAbstract:A variety of carbonyl compounds have been successfully converted to the corresponding Thioacetal derivatives in good to excellent yields on the reaction of carbonyl compounds with 1,2-ethanedithiole, 1,3-propanedithiol, and ethanethiol in the presence of catalytic amount of benzyltriphenylphosphonium tribromide under solvent-free conditions. Some of the major advantages of this method are mild reaction conditions, high efficiency, and compatibility with other reported methods. In addition, no bromination occurs at the double bond, or α to the keto position, or even in the aromatic ring under these experimental conditions.
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solid state deprotection of Thioacetals and thioketals using 1 benzyl 4 aza 1 azoniabicyclo 2 2 2 octane periodate and aluminum chloride
Organic Preparations and Procedures International, 2005Co-Authors: Abdol R Hajipour, Arnold E RuohoAbstract:Carbonyl compounds are often protected as Thioacetals and thioketals in organic synthesis,'** due to their stability under both acidic and basic conditions. Many procedures are available for the preparation of these derivatives 3-4 and extensive studies on the deprotection of these derivatives to the parent carbonyl compounds have been carried However, some of these methods for deprotection require higher temperatures, long reaction times and involve toxic metal ions and solvents which are detrimental to the environment? Therefore, there is need for a simple, less expensive and safer methods for deprotection of Thioacetals and thioketals. In recent years, there has been an increasing interest in reactions that proceed in the absence of solvent due to reduced pollution, low costs and simplicity in process and straightforward w~rk-up .~ Because of our interest in development of solvent-free reactions? we now report 1 -benzyl-4-aza-l-azoniabicyclo[2.2.2]octane periodate 1 as an efficient and selective reagent for the deprotection of Thioacetal 2 or 3 (1 ,%diThioacetals and 1 ,Idithianes) to the corresponding carbonyl compounds 4. 1-Benzyl-4-aza1 -azoniabicyclo[2.2.2]octane periodate (1) is a mild, efficient, stable and inexpensive reagent; it is a white powder, which is quite soluble in polar
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deprotection of Thioacetal using 1 butyl 4 aza 1 azoniabicyclo 2 2 2 octane dichromate babod in the presence of alcl3
Journal of Chemical Research-s, 2005Co-Authors: Abdol R Hajipour, Hamid R Bagheri, Arnold E RuohoAbstract:A variety of Thioacetal (2) are deprotected to parent carbonyl compounds (3) using 1-butyl-4-aza-1-azoniabicyclo[2.2.2] octane dichromate (BABOD) (1) in the presence of AlCl 3 in refluxing CH 3 CN.
Christine E Brotherton - One of the best experts on this subject based on the ideXlab platform.
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preparation and three carbon two carbon cycloaddition of cyclopropenone 1 3 propanediol ketal 5 5 dicyano 4 phenyl 2 cyclopenten 1 one 1 3 propanediol ketal
Organic Syntheses, 2003Co-Authors: Dale L Boger, Christine E Brotherton, Gunda I GeorgAbstract:Preparation and three-carbon + two-carbon cycloaddition of cyclopropenone 1,3-propanediol ketal: 5,5-Dicyano-4-phenyl-2-cyclopenten-1-one 1,3-propanediol ketal intermediate: 2-(bromomethyl)-2-(chloromethyl)-1,3-dioxane intermediate: Cyclopropenone 1,3-propanediol ketal product: 5,5-dicyano-4-phenyl-2-cyclopenten-1-one 1,3-propanediol ketal Keywords: acetal (and Thioacetal) formation; alkylation, C-alkylation; annulation, carbocyclic-[3]; annulation, carbocyclic-[5]; cyclization, condensation; cyclization, cycloaddition; halogenation, bromination; halogenation, bromination; ring expansion reactions; potassium amide, preparation of; pressure reactions, use of resealable glass tubes
