scholarly journals A synthetic application of methylthioacetonitrile. I. A synthesis of cis- and trans-.BETA.-arylacrylonitriles, .BETA.,.GAMMA.-unsaturated nitriles and carbonyl compounds.

1978 ◽  
Vol 26 (6) ◽  
pp. 1874-1879 ◽  
Author(s):  
SHINZO KANO ◽  
TSUTOMU YOKOMMATSU ◽  
TOSHIHIRO ONO ◽  
SATOSHI HIBINO ◽  
SHIROSHI SHIBUYA
Keyword(s):  
Carbonyl Compounds ◽  
Cis And Trans ◽  
Synthetic Application

scholarly journals Leaf Essential Oil Composition of Five Species of Beilschmiedia from Monteverde, Costa Rica

2007 ◽  
Vol 2 (1) ◽  
pp. 1934578X0700200 ◽  
Author(s):  
William N. Setzer ◽  
William A. Haber
Keyword(s):  
Costa Rica ◽  
Essential Oil ◽  
Carbonyl Compounds ◽  
Essential Oil Composition ◽  
Chemical Compositions ◽  
Oil Composition ◽  
Germacrene D ◽  
Leaf Oil ◽  
Leaf Essential Oil ◽  
Cis And Trans

The leaf essential oils of five species of Beilschmiedia from Monteverde, Costa Rica (Beilschmiedia alloiophylla, B. brenesii, B. costaricensis, B. tilaranensis, and an undescribed Beilschmiedia species “chancho blanco”) have been obtained by hydrodistillation and analyzed by GC-MS in order to discern the differences and similarities between the volatile chemical compositions of these species. The principal constituents of B. alloiophylla leaf oil were germacrene D (18.9%), cis- and trans-β-ocimene (18.8% and 9.3%, respectively), α-pinene (11.8%), and bicyclogermacrene (9.1%). The leaf oil of B. brenesii was composed largely of the sesquiterpenes germacrene D (19.3%), β-caryophyllene (13.4%), α-copaene (9.0%), α-humulene (8.1%), and δ-cadinene (5.8%), and the carbonyl compounds 2-undecanone (12.8%), trans-2-hexenal (8.8%), and 2-tridecanone (3.8%). α-Bisabolol (72.1%) dominated the leaf oil of B. costaricensis, while B. tilaranensis had germacrene D (54.9%), β-caryophyllene (14.8%), and δ-cadinene (5.1%) as major components. Beilschmiedia “chancho blanco” leaf oil was composed largely of β-caryophyllene (16.6%), bicyclogermacrene (14.1%), and α-pinene (12.1%).

Synthesis of 3,4-Dihydro-2H-pyrans by Hetero-Diels-Alder Reactions of Functionalized α,β-Unsaturated Carbonyl Compounds with Styrenes

2001 ◽  
Vol 56 (4-5) ◽  
pp. 416-422 ◽  
Author(s):  
Krystyna Bogdanowicz-Szwed ◽  
Aleksandra Pałasz
Keyword(s):  
Carbonyl Compounds ◽  
Diels Alder ◽  
Cis And Trans

Abstract Cycloadditions of 3-aryl-2-benzoyl-2-propenenitriles 1a,b to styrene (2a) and its methyl or methoxy-substituted derivatives 2b-d proceed regio- and diastereoselectively yielding cis and trans diastereoisomers of 2,4,6-triaryl-3,4-dihydro-2H-pyran-5-carbonitriles 3 and 4 in 59-72% yield. Cycloadducts cis-3 were the major products. Reaction of 5-(4-nitrobenzylidene)-1,3-dimethylbarbituric acid (5) with styrenes 2a-d afforded diastereoisomeric mixtures of 2H-pyrano[2,3-d]pyrimidine-2,4(3H)-diones cis-6 and trans-7 in 71 - 78% yield.

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