Natural and synthetic chromenes, fused chromenes, and versatility of dihydrobenzo[h]chromenes in organic synthesis.

Chromenes and benzofurans of the asteraceae, their chemistry and biological significance

http://users.auth.gr/akrivos/metaptyxiaka/proxorimeni anorgani/coord_chem_rev_199_2000_89.pdf

The preparation and coordination chemistry of phosphorussulfur donor ligands

Die Untersuchung von sechs mexikanischen Arten der alten Gattung Eupatorium, die jetzt in die Gattungen Ageratina, Critonia und Fleischmannia eingeordnet werden, ergibt zwei neue Sesquiterpensauren (12 und 16), ein Cadinan-Derivat (40) und drei Sesquiterpenlactone (41, 57 und 58). Auserdem werden neben bereits bekannten Verbindungen elf neue Thymolderivate (3–10 und 46–48), vier p-Hydroxyacetophenon-Derivate (21, 26, 30 und 45), drei Benzoesaurebenzylester (35–37), ein Flavanon (54) und ein Lignan (60) isoliert. Die Konstitutionen werden durch spektroskopische Daten sowie durch einige chemische Reaktionen geklart. Die chemotaxonomischen Aspekte werden diskutiert.



Naturally Occurring Terpene Derivatives, 76. On Constituents of the Eupatorium Group



The investigation of six Mexican species of the old genus Eupatorium which are now placed in the genera Ageratina, Critonia and Fleischmannia, yields two new sesquiterpenic acids (12 and 16), a cadinane derivative (40) and three sesquiterpene lactones (41, 57 and 58). In addition besides already known compounds eleven new thymol derivatives (3–10 and 46–48), four p-hydroxy-acetophenone derivatives (21, 26, 30 and 45), three benzyl benzoates (35–37), a flavanone (54) and a lignan (60) are isolated. The structures are established by spectroscopic data as well as by some chemical reactions. The chemotaxonomical aspects are discussed.

Natürlich vorkommende Terpen‐Derivate, 76. Über Inhaltsstoffe der Eupatorium‐Gruppe

Chromones and coumarins from skimmia laureola

/pdf/new-chromenes-from-eupatorium-species-3olg62cptl.pdf

New Chromenes from Eupatorium Species.

/pdf/phosphinodithioformates-i-reactions-of-secondary-phosphines-uiscmdoe8s.pdf

Phosphinodithioformates. I. Reactions of Secondary Phosphines with Carbon Disulfide in the Presence of Bases.

/pdf/phosphinodithioformates-ii-s-alkyl-p-p-disubstituted-1zi710rc7o.pdf

Phosphinodithioformates. II. S-Alkyl P,P-Disubstituted Thiophosphinoyldithioformates.

/pdf/phosphinodithioformates-iii-p-p-disubstituted-2xpqc70v03.pdf

Phosphinodithioformates. III. P,P-Disubstituted Thiophosphinoylthioformamides.

/pdf/low-temperature-polarized-spectra-of-potassium-potassium-bis-4csxmj63n8.pdf

Ole Larsen

Papers

New Chromenes from Eupatorium Species.

Phosphinodithioformates. I. Reactions of Secondary Phosphines with Carbon Disulfide in the Presence of Bases.

Phosphinodithioformates. II. S-Alkyl P,P-Disubstituted Thiophosphinoyldithioformates.

Phosphinodithioformates. III. P,P-Disubstituted Thiophosphinoylthioformamides.

Low Temperature Polarized Spectra of Potassium Potassium Bis Oxalato trans Diaquo Chromium(III) Trihydrate.