Iodine(V) Reagents in Organic Synthesis. Part 4. <i>o</i>-Iodoxybenzoic Acid as a Chemospecific Tool for Single Electron Transfer-Based Oxidation Processes
作者:K. C. Nicolaou、T. Montagnon、P. S. Baran、Y.-L. Zhong
DOI:10.1021/ja012127+
日期:2002.3.1
o-Iodoxybenzoic acid (IBX), a readily available hypervalent iodine(V) reagent, was found to be highly effective in carrying out oxidations adjacent to carbonyl functionalities (to form alpha,beta-unsaturated carbonyl compounds) and at benzylic and related carbon centers (to form conjugated aromatic carbonyl systems). Mechanistic investigations led to the conclusion that these new reactions are initiated
Preparation of cis- and trans-cyclodec-2- and -3-enones and studies of interconversions between them
作者:G. H. Whitham、M. Zaidlewicz
DOI:10.1039/p19720001509
日期:——
The cis- and trans-cyclodec-2- and -3-enones have been synthesised by stereospecific routes; a preparation of 3-hydroxycyclodecanone has also been developed. Under conditions of acid catalysis cis- and trans-cyclodec-2-enones are rapidly interconverted to give an equilibrium mixture containing 96% of the cis- and 4% of the trans-isomer. Efficient equilibration with the unconjugated isomers was not
CYCLODODECADIENONE DERIVATIVES AS PERFUMING INGREDIENTS
申请人:FIRMENICH SA
公开号:US20160060569A1
公开(公告)日:2016-03-03
The present invention relates to compounds of formula
wherein one R group is a hydrogen atom and the other is a hydrogen atom or a C
1-3
alkyl group; and
each carbon-carbon double bond of said compound, independently from each other, can be in a configuration Z or E or a mixture thereof;
which are useful perfuming ingredients.
Butlin, Roger J.; Linney, Ian D.; Mahon, Mary F., Journal of the Chemical Society. Perkin transactions I, 1996, # 1, p. 95 - 106
作者:Butlin, Roger J.、Linney, Ian D.、Mahon, Mary F.、Tye, Heather、Wills, Martin
DOI:——
日期:——
Syntheses and properties of 5-substituted [n](2,4)pyridinophanes, model compounds of NAD(P)
作者:Tadayoshi Oikawa、Nobuhiro Kanomata、Masaru Tada
DOI:10.1021/jo00060a018
日期:1993.4
[n](2,4)Pyridinophane derivatives 5-8 having an ester or an amide group at the 5-position were synthesized by aza-Wittig reactions between beta-substituted vinyliminophosphoranes and cyclic alpha,beta-unsaturated ketones. [beta-(Methoxycarbonyl)vinyl]- (1), [beta-(N,N-tetramethylenecarbamoyl)vinyl]-(2), [beta-(N-benzylcarbamoyl)vinyl]-(3), and (beta-carbamoylvinyl)iminophosphorane (4) were synthesized from the corresponding vinyl azides and triphenylphosphine. The heptamethylene chains of 5-(methoxycarbonyl)[7](2,4)pyridinophane (5),5-(N,N-tetramethylenecarbamoyl)[7](2,4)pyridinophane (6), and 5-(N-benzylcarbamoyl)[7](2,4)pyridinophane (7) flipped with AG(double dagger) = 11.2 (T(c) = 10.3-degrees-C), 10.8 (T(c) = 0.2-degrees-C), and 10.5 kcal/mol (T(c) = -5.2-degrees-C), respectively. At lower temperatures, the three conformations of the heptamethylene bridge were frozen. Methylpyridinium iodides 10 (n = 7, 6, and 5) derived from 6 were reduced more easily [E1/2* (half height potential) = -1.65 V (n = 7); -1.63 V (n = 6); -1.29 V vs Ag/AgCl (n = 5)] than the reference compound, 2,4-diethyl-5-(N,N-tetramethylenecarbamoyl)pyridinium ion (11) [E1/2* = -1.82 V vs Ag/AgCl]. The reduced species dimerized quickly.