The present invention relates to: a novel dienal compound which has an aromatic odor useful for use as a compound flavor raw material or the like; and a flavor composition containing the dienal compound. The dienal compound according to the present invention is characterized by being represented by general formula (1):
(wherein R represents an alkyl group having 8 to 10 carbon atoms; and a wavy line represents a cis form, a trans form, or a mixture of a cis form and a trans form).
Iridium-Catalyzed Asymmetric Hydrogenation Yielding Chiral Diarylmethines with Weakly Coordinating or Noncoordinating Substituents
作者:Päivi Tolstoy、Mattias Engman、Alexander Paptchikhine、Jonas Bergquist、Tamara L. Church、Abby W.-M. Leung、Pher G. Andersson
DOI:10.1021/ja9013375
日期:2009.7.1
in pharmaceuticals and natural products, making the synthetic methods that form these chiral centers are important in industry. We have applied iridium complexes with novel N,P-chelating ligands to the asymmetric hydrogenation of trisubstituted olefins, forming diarylmethine chiral centers in high conversions and excellent enantioselectivities (up to 99% ee) for a broad range of substrates. Our results
Natural acetylenes. Part XXXIX. Synthesis of methyl [1,9-14C]-, [9-14C]-, and [10-3H]-crepenynate, methyl [9-14C]- and [10-3H]-linoieate, and methyl [9-14C]- and [10-3H]-oleate
作者:G. C. Barley、Ewart R. H. Jones、V. Thaller、R. A. Vere Hodge
DOI:10.1039/p19730000151
日期:——
Specificallylabelled methyl crepenynate and oleate have been synthesised from the C9 phosphoranes, Me[CH2]4·CC·CH2·CHPPh3 and Me[CH2]7·CHPPh3, respectively, and the C9 aldehyde ester, OCH·[CH2]7·CO2Me; methyl linoleate has been obtained by partial hydrogenation of the crepenynate. Carbon-14 was introduced into the C18 esters via the [9-14C]- and [1,9-14C]-aldehyde esters, and tritium via a reaction