On the essential oil of achasma walang val

Romburgh, P. van

doi:10.1002/recl.19380570508

Cited by 10 publications

(4 citation statements)

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“…The melting points of the 2,4-dinitrophenyl- Vol, 79 hydrazones showed good agreement with those reported in the literature. In preparing the semicarbazones, a solution was made of 5 g. of semicarbazide hydrochloride, 7.5 g. of sodium acetate, 20 ml. of alcohol and 20 ml.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, 2-heptenal has been found in some fat oxidation products15-17; 2-octenal in autoxidation products of cottonseed oil18; 2-nonenal from the oxidative fission of the hydroperoxide of methyl oleate19 and in the essential oil of Achasma walang Val20; 2-decenal, in the essential oils of Achasma walang Val,20 Coriandrum sativum21 and sweet orange oil from French Guinea.22 2-Undecenal has been identified in the decomposition product of the hydroperoxide of methyl oleate23; 2-dodecenal in the essential oil of Eryngium foetidum L.,24 in sweet orange oil of French Guinea22 and in the essential oil of Achasma walang Val. 20 The preparation of the acetals of ,ß-unsaturated aldehydes through the elimination of HBr from -bromo acetals has been applied to the lower members of this series. Thus a-bromo-re-valeraldehyde gave good yields of the unsaturated acetal when heated with a large excess of potassium hydroxide.25 Others have used potassium Z-butoxide for the elimination of HBr from the bromo acetals of re-butyraldehyde and isovaleraldehyde.28 In the present investigation, it was found convenient to boil the bromoacetal in a solution of potassium hydroxide in re-butyl alcohol.…”

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confidence: 99%

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Preparation of α,β-Unsaturated Aldehyde Dimethyl Acetals and their Free Aldehydes

Bedoukian¹

1957

J. Am. Chem. Soc.

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centration was estimated on the basis of equation 10, to give an approximate value of 2 X 10-3 l.2 mole-2 sec.-1 for k¡, at 30°.Values for the rate constants k-¡ and ki were obtained at 10, 20, 30 and 40°. These results are summarized in Table IV along with the energies of Table IV Summary of the Rate Constants at Various Temperatures AND OF THE ENTHALPIES AND ENTROPIES OF ACTIVA-Temp., °C. Equation 2°Equation 36 kc 10 (2.6 dr 0.2)10-2 (0.86 ± 0.01)10-= kc 20 o -H CO (2.2 ± ,l)10-= k°30(9.9 ± .3)10-2 (6.7 ± ,2)10-= kc 40 (13.8 ± 1.2)10-2 (14.3 ± .4)10-= ±, kcal.10.6 16.15±, e.u. 30-28.2 -24.6 " The units of fe2 are l.2 mole-2 sec.1. 6 The units of kz are 1. mole-1 sec. l. = The measure of the precision is the standard deviation of the average values used.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Preparation of α,β-Unsaturated Aldehyde Dimethyl Acetals and their Free Aldehydes

Bedoukian¹

1957

J. Am. Chem. Soc.

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“…Hydrogenation at balloon pressure (72−90%) gave saturated aldehyde 48 contaminated with acid 49 . The abundance of acid 49 varied from 6% to 26% and may have been due to air oxidation of 44 during handling …”

Section: Chemistrymentioning

confidence: 99%

Restricted Conformation Analogues of an Anthelmintic Cyclodepsipeptide

Dutton¹,

Lee²,

Johnson³

et al. 2003

J. Med. Chem.

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Six analogues of the anthelmintic cyclodepsipeptide PF1022A were prepared, each containing a small ring fused to the macrocycle to restrict the number of conformations the larger ring can adopt. It was anticipated that such conformational changes could lead to enhanced biological activity and selectivity. The analogues form two series of three members each. In one series, a carbon-based molecular bridge joins the methyl of a leucine residue with the methyl of its closest lactic acid residue to form five-, six-, and seven-membered lactam rings. In the second series, a leucine residue is replaced with five-, six-, and seven-membered nitrogen heterocycles. Decreasing the size of the small ring in the lactam series increasingly distorts the macrocycle and consistently decreases activity relative to PF1022A. In the leucine series, a similar trend is observed. Molecular modeling of PF1022A along with the analogues described herein suggests that the ability to exist in a highly symmetrical conformational state is a necessary condition for biological activity.

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“…However, recent advances in ligand design have led to catalyst systems capable of delivering high substrate conversions with remarkable regioselectivities for a wide range of substrates, , including particularly difficult-to-activate internal and tetrasubstituted olefins . From the standpoint of polymer synthesis, hydroesterificative polymerization has the potential to provide access to polyesters derived from hydroxy olefins, many of which can be obtained directly from renewable sources. − Additionally, the regioselective control of these systems has the potential to provide direct access to a wide range of branched polymer architectures without having to preinstall branch points via multistep monomer syntheses. , …”

Section: Introductionmentioning

confidence: 99%

Mechanistic Study of Palladium-Catalyzed Hydroesterificative Copolymerization of Vinyl Benzyl Alcohol and CO

2019

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The copolymerization of vinyl benzyl alcohol (VBA) and carbon monoxide (CO) to give a new polyester poly(VBA-CO) has been achieved via palladium-catalyzed hydroesterification. Reaction conditions involve moderate temperatures, moderate to low CO pressures, and low catalyst loadings to give a low molar mass (M n ∼ 3−4 kg/mol) polymer as a ∼2:1 mixture of linear to branched repeat units. The polymer molar mass increase is consistent with a step-growth polymerization mechanism, and ester yields of >97% are achieved within 24 h. However, increases in M n cease beyond 16 h. Control experiments indicate that the degree of polymerization is limited due to a combination of side reactions such as alcoholic end-group oxidation, hydroxycarbonylation, and alcohol acetylation, which lead to the degradation of monomeric and polymeric end groups. When a less promiscuous substrate is used such as 10-undecenol, higher molar masses (M n ∼ 16 kg/mol) are achieved. This method has the potential to be a mild route to new polyester architectures with appropriate mitigation of side reactions.

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On the essential oil of achasma walang val

Cited by 10 publications

References 1 publication

Preparation of α,β-Unsaturated Aldehyde Dimethyl Acetals and their Free Aldehydes

Preparation of α,β-Unsaturated Aldehyde Dimethyl Acetals and their Free Aldehydes

Restricted Conformation Analogues of an Anthelmintic Cyclodepsipeptide

Mechanistic Study of Palladium-Catalyzed Hydroesterificative Copolymerization of Vinyl Benzyl Alcohol and CO

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