c- and t-3-Acetyl-1,c-2-dimethyl-r-1-cyclopentanols and c-3-acetyl-1,t-2-dimethyl-r-1-cyclopentanol are synthesized stereoselectively and dl-plinols A, B, and C are prepared therefrom.
New functionalized 2-oxabicyclo[2, 2, 1]heptane derivatives were synthesized for their potential biological activities by way of the intramolecular ether bond formation of plinol C that was obtained from linalool by a thermal ene reaction. The mechanism for the ether-forming reactions is discussed.
The Magnesium−Ene Cyclization Stereochemically Directed by an Allylic Oxyanionic Group and Its Application to a Highly Stereoselective Synthesis of (±)-Matatabiether. Allylmagnesium Compounds by Reductive Magnesiation of Allyl Phenyl Sulfides<sup>1</sup>
more easily prepared in a connective fashion than the usual allyl halide precursor. Since the presence of lithium ions encourages undesirable proton transfer to the cyclized organometallic and is detrimental to the stereochemical control, the conversion of the allylic thioether to the allylmagnesium utilizes a lithium-free method involving direct reductive magnesiation in the presence of the magnesium-anthracene
Nitriles and aldehydes derived from 3-isopropenyl-1,2-dimethyl-1-cyclopentanol and their use in perfumery
申请人:Firmenich, SA
公开号:US06410504B1
公开(公告)日:2002-06-25
The compounds of formula
in which X is a C≡N group or a C(H)═O group and the C5-ring is either saturated or carries a double bond in one of the positions indicated by the dotted lines, or any mixture of two or more compounds of formula (I), are described.
The compounds and mixtures were found to be useful as perfuming ingredients, with the compounds of the above formula in which X is a C≡N group and the C5-ring has a double bond in one of the positions indicated by the dotted lines, being particularly stable in aggressive media. The odor note of these compounds is quite close to that of citral, i.e. of the fresh-citrus type with green and lime connotations.
Nitriles et aldéhydes dérivés du 3-isopropényl-1,2-diméthyl-1-cyclopentanol et leur utilisation en parfumerie
申请人:FIRMENICH SA
公开号:EP0916650A2
公开(公告)日:1999-05-19
On décrit des composés de formule
dans laquelle X représente un groupe C≡N ou un groupe C(H)=O et dans laquelle le cylce en C5 est soit saturé, soit comprend une double liaison dans l'une des positions indiquées par les pointillés, ou tout mélange de deux ou plusieurs composés de formule (I).
Ces composés ou ces mélanges se sont avérés très utiles en tant qu'ingrédients parfumants avec les composés de formule ci-dessus dans laquelle X est un groupe C≡N et le cylce en C5 comporte une double liaison dans l'une des positions indiquées par les pointillés, étant particulièrement stables dans les milieux agressifs. La note olfactive de ces composés est très proche de celle du citral, à savoir fraîche-hespéridée, avec des connotations limette-verte.
式中的化合物
其中 X 代表 C≡N 基团或 C(H)=O 基团,且 C5 环饱和或在虚线所示位置之一包含双键,或两种或两种以上式 (I) 化合物的混合物。
这些化合物或混合物已被证明是非常有用的香水成分,其中 X 为 C≡N 基团且 C5 环在虚线所示位置之一含有双键的上式化合物在腐蚀性介质中特别稳定。这些化合物的嗅觉气味非常接近柠檬醛,即清新的浆果味,并带有青绿色的内涵。