1482-15-1Relevant academic research and scientific papers
ETHERS AND ESTERS OF TERTIARY ALKANOLS FOR USE AS AROMA CHEMICALS
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Page/Page column 49, (2020/05/21)
The present invention relates to the use of an ether or an ester of a tertiary alkanol or of mixtures of two or more ethers or esters of tertiary alkanols or of a stereoisomer thereof or of a mixture of two or more stereoisomers thereof as aromachemicals; to the use thereof for modifying the scent character of a fragranced composition; to an aroma chemical composition containing an ether or an ester of tertiary alkanol or of mixtures of two or more ethers or esters of tertiary alkanols or of a stereoisomer thereof or of a mixture of two or more stereoisomers thereof; and to a method of preparing a fragranced composition or for modifying the scent character of a fragranced composition. The invention further relates to specific ethers or esters of tertiary alkanols.
Pd(II)-catalyzed highly regio-and stereoselective assembly of C-C double bonds: An efficient method for the synthesis of 2,4-dihalo-1,3,5-trienes from alkynols
Jiang, Huanfeng,Gao, Yang,Wu, Wanqing,Huang, Yubing
supporting information, p. 238 - 241 (2013/03/13)
A highly efficient method for the synthesis of 2,4-dihalo-1,3,5-trienes from alkynols was developed. This chemistry allows access to multiple conjugated double bonds in a single step with high stereoselectivity.
A novel Ireland-Claisen rearrangement/Diels-Alder tandem reaction of propargylic acrylates with acyclic dienophiles
Li, Yun-Xia,Sheng, Yi-Lin,Zhang, Bi-Song
, p. 137 - 139 (2013/06/26)
A novel DABCO-catalyzed Ireland-Claisen rearrangement/Diels-Alder tandem reaction of propargylic acrylates 3 with dienophiles 4 was developed in the presence of an excess TMSCl and DBU with 1% hydroquinone as polymerization inhibitor in acetonitrile at refluxing temperature under air. This protocol gave cyclic α,β-unsaturated carboxylic acids 5 with complete regioselectivity.
Using nazarov electrocyclization to stage chemoselective [1,2]-migrations: Stereoselective synthesis of functionalized cyclopentenones
Lebuf, David,Huang, Jie,Gandon, Vincent,Frontier, Alison J.
supporting information; experimental part, p. 10981 - 10985 (2011/12/16)
Highly functionalized cyclopentenones have been prepared stereospecifically through a chemoselective copper(II)-mediated Nazarov/Wagner-Meerwein rearrangement sequence. After the initial 4π electrocyclization, this reaction involves two sequential [1,2]-m
Stereoselective One-Pot synthesis of 1-Aminoindanes and 5,6-Fused azacycles using a Gold-Catalyzed Redox-Pinacol-Mannich-Michael cascade
Yeom, Hyun-Suk,Lee, Youngun,Jeong, Jaewon,So, Eunsoo,Hwang, Soojin,Lee, Ji-Eun,Lee, Shim Sung,Shin, Seunghoon
supporting information; experimental part, p. 1611 - 1614 (2010/06/15)
"Chemical Equation Presented" Just another Mannich Monday: A cascade intramolecular redox-pinacol-Mannich-Michael reaction sequence catalyzed by gold complexes can be used to generate a variety of structures including spirocycles, 1-aminoindanes, and 5,6-fused azabicycles that have a quaternary carbon center. The reaction is characterized by complete atom-economy, high diastereoselectivity, and remarkable efficiency through tandem reactions.
Catalytic hydromagnesiation of 2-alkylbutadienes
Viktorov,Zubritskii
, p. 1773 - 1785 (2007/10/03)
The effect of alkyl substituents in 2-alkylbutadienes on their hydromagnesiation with alkylmagnesium halides was studied. 2001 MAIK "Nauka/Interperiodica".
Carbon-carbon bond formation in regio- and stereoselective palladium-catalyzed cyclization of allene-substituted conjugated dienes
Loefstedt, Joakim,Franzen, Johan,Baeckvall, Jan-E.
, p. 8015 - 8025 (2007/10/03)
Regio- and stereoselective palladium-catalyzed reactions of allene-substituted 1,3-dienes 1 in acetic acid at room temperature lead to cyclization with formation of a carbon-carbon bond between the middle carbon of the allene and the terminal carbon of the 1,3-diene. Two different types of reactions, both that constitute 1,4-carboacetoxylations of the 1,3-diene, have been developed. In one of the reactions, Pd(II) catalyzes the oxidation of 1 to bicyclic compounds 2, and in the other, Pd(0) catalyzes the transformation of 1 to bicyclic compounds 3. The products 2 are useful for further synthetic tr0nsformations and undergo Diels-Alder reactions with dienophiles to give polycyclic ring systems.
Catalytic hydromagnesation of di- and polymethyl-substituted 1,3-butadienes
Viktorov,Zubritskii
, p. 1755 - 1765 (2007/10/03)
Hydromagnesation of di- and polymethyl-substituted 1,3-butadienes with alkylmagnesium halides in the presence of Ni(PPh3)2Cl2 and NiPy4Cl2 was studied.
Rearrangements of bridged diallenes. A facile synthesis of novel condensed heterocycles by tandem [3,3]-sigmatropic rearrangement and double intramolecular michael addition of diallenyl disulfides and diselenides. Isolation of stable diallenyl diselenides
Braverman, Samuel,Freund, Meir
, p. 5759 - 5776 (2007/10/02)
Thienothiophene 14 and selenoloselenophene 16 have been synthesized by the action of lithium methoxide on τ,τ-dimethylallenyl thiocyanate and selenocyanate, respectively. A multistep mechanism involving bis-τ,τ-dimethylallenyl disulfide (20) or diselenide as key intermediates, is suggested. The latter are believed to undergo consecutive 3,3]-sigmatropic rearrangement and double Michael addition, to the observed products. This mechanism is supported by the isolation of bis-τ,τ- diisopropylallenyl and bis-τ-methyl-τ-isopropylallenyl diselenides, under the same reaction conditions, and the rearrangement of the latter to the expected selenoloseleophene 33. The synthesis of the novel mixed selenolothiophene 35 by treatment of a mixture of allenyl thiocyanate 13 and selenocyanate 15 with lithium methoxide, is also described.
