3-(1-pyrrolidinyl)-2-cyclopenten-1-one 在
tetrakis(pyrrolidino)titanium 甲苯 作用下,
以
甲苯 为溶剂,
反应 16.0h,
以to give 2.75 g of red crystalline solid的产率得到1,3-dipyrrolidino-1,3-cyclopentadiene
参考文献:
名称:
Bis(n,n-dihydrocarbylamino)-substituted cyclopentadienes and metal complexes thereof
Method and compositions for imparting cooling effect to tobacco products
申请人:Bereman D. Robert
公开号:US20050000529A1
公开(公告)日:2005-01-06
The present invention relates to smoking articles such as cigarettes, and in particular to a method and composition for providing a cooling effect to cigarettes. The tobacco rod of the cigarette contains a compound that imparts a cooing effect and sensation of freshness to tobacco smoke.
Systematic Studies on Structure and Physiological Activity of Cyclic α-Keto Enamines, a Novel Class of “Cooling” Compounds
作者:Harald Ottinger、Tomislav Soldo、Thomas Hofmann
DOI:10.1021/jf010857v
日期:2001.11.1
3-methyl- and 5-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one were recently identified as intense cooling compounds in roasted dark malt. To gain more insights into the molecular requirements of these compounds for imparting a cooling sensation, 26 cyclic alpha -keto enamine derivatives were synthesized, and their physiological cooling activities were evaluated. Any modification of the amino moiety, the carbocyclic ring size, or incorporation of additional methyl groups led to a significant increase of the cooling threshold. Insertion of an oxygen atom into the 2-cyclopenten-1-one ring, however, increased the cooling activity, e.g., the cooling threshold of the 5-methyl-4-(1-pyrrolidinyl)3(2H)-furanone was found to be 16-fold below the threshold concentration determined for the 3-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one. Shifting the oxygen atom from the 4- into the 5-position of the cyclopentenone ring resulted in a even more drastic increase in cooling activity, e.g., the 4-methyl-3-(1-pyrrolidinyl)-2(5H)-furanone exhibited the strongest cooling effect at the low oral threshold concentration of 0.02-0.06 mmol/L, which is 35-fold below the value determined for H-menthol. In contrast to the minty smelling (-)-menthol, most of the alpha -keto enamines were found to be virtually odorless but impart a sensation of "cooling" to the oral cavity as well as to the skin, thus illustrating that there is no physiological link between cooling activity and mint-like odors.
BIS(N,N-DIHYDROCARBYLAMINO)- SUBSTITUTED CYCLOPENTADIENES AND METAL COMPLEXES THEREOF
申请人:THE DOW CHEMICAL COMPANY
公开号:EP1177198A1
公开(公告)日:2002-02-06
METHOD AND COMPOSITIONS FOR IMPARTING COOLING EFFECT TO TOBACCO PRODUCTS