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'Structure Elucidation' in keywords Facet   Publication Year 1999  [X]
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Publication Year
1999[X]
1Author    Viqar Uddin, Ahmad, ZulfiqarA. Li3, Muhammad Shaiq, A. Li3, Fazila Iqbal3, Muhammad Zahid3, RasoolBakhsh Tareenb, H.E JRequires cookie*
 Title    Two New Aromatic Constituents from Stocksia brahuica  
 Abstract    The methanolic extract of Stocksia brahuica yielded two new aromatic constituents: diphe­ nylacetic acid and brahene (2',4'-dihydroxy-7-methoxy-4,5-methylenedioxyisoflavene). Their structures were characterized with the help of modern spectroscopic techniques including 2D-NMR. 
  Reference    Z. Naturforsch. 54b, 940—942 (1999); received January 2 1999 
  Published    1999 
  Keywords    Diphenylacetic Acid, Brahene, Sapindaceae, Stocksia brahuica, Structure Elucidation 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0940.pdf 
 Identifier    ZNB-1999-54b-0940 
 Volume    54 
2Author    Joachim Heinickea, Attila Dala, Hans-Friedrich Kleinb, Olaf Hetcheb, Ulrich Flörkec, Hans-Jürgen HauptcRequires cookie*
 Title    Formation of r71-P-(2-Phosphinophenol)Ni(0)(PMe3)3 and Oxidation to cjs/fraws-Bis(2-phosphinophenolato)nickel(II) Complexes  
 Abstract    o-Phosphinophenols 1 (P ^ O H) react with equimolar amounts of Ni(PMe3)4 at low tempera­ tures to give yellow Ni(0) complexes such as [(HO~P)Ni(PMe3)3] 2a with only P coordination of the P ^ O H ligand. Oxidation of solutions of 1 and Ni(PMe3)4 by dioxygen leads to brown bis(o-phosphinophenolato-P^O)nickel chelate complexes 3a-d. Structure elucidation by NM R is consistent with a m-square planar geometry for 3a-c and a rrans-square planar solution struc­ ture of the terr-butylphenylphosphino derivative 3d. The geometric isomers were distinguished by different ranges of phosphorus coordination shifts and 3lP-l3C-2 and 3IP-13C-1 coupling 
  Reference    Z. Naturforsch. 54b, 1235—1243 (1999); received May 19 1999 
  Published    1999 
  Keywords    Phosphinophenolate, Nickel, Complexes, Structure Elucidation, Solid State Structures 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1235.pdf 
 Identifier    ZNB-1999-54b-1235 
 Volume    54 
3Author    Thomas Fendert3, VictorW. Rayb, RobW M Van Soestc, Peter Proksch3Requires cookie*
 Title    Bromoisoxazoline Alkaloids from the Caribbean Sponge Aplysina insularis  
 Abstract    An investigation of a specimen of the Caribbean sponge A plysina insularis resulted in the isolation of fourteen bromoisoxazoline alkaloids (1 -1 4), of which 14-oxo-aerophobin-2 (1)* is a novel derivative. Structure elucidation of the compounds have been established from spectral studies and data for 1 are reported. Constituents 2 to 6 and 11 to 14 have not been identified sofar in A plysina insularis species. The presence of the known compounds 7 to 9 in A plysina insularis indicates that their use for chem otaxonom ical purposes is questionable. 
  Reference    Z. Naturforsch. 54c, 246 (1999); received D ecem ber 23 1998/January 22 1999 
  Published    1999 
  Keywords    Sponges, A plysina insularis, Bromoisoxazoline Alkaloids, Chemotaxonomy, Structure Elucidation 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0246.pdf 
 Identifier    ZNC-1999-54c-0246 
 Volume    54 
4Author    M. Uhammad, Shaiq Ali, Muhammad Saleem, Viqar Uddin, H.E JRequires cookie*
 Title    Zatatriol: A New Aromatic Constituent from Zataria multiflora Ahm ad  
 Abstract    A new isopropyl benzene derivative named as zatatriol (5) and two synthetically known compounds (2 and 7) having the same skeleton have been isolated from the hexane soluble part of a Lamiaceous plant Zataria multiflora. In addition to 2, 5 and 7, som e known constitu­ ents: p-cym ene (1), thymol (3), thymol methyl-ether (4) , /3-sitosterol, stigmasterol, oleanolic acid, betulinic acid, and hexadecanoic acid have also been isolated from the same source. Structures of the isolated constituents were elucidated with the aid of NM R spectroscopy. 
  Reference    Z. Naturforsch. 54b, 807 (1999); received July 22 1998 
  Published    1999 
  Keywords    Lamiaceae, Zataria multiflora, Isopropyl Benzene Constituents, Structure Elucidation, N M R Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0807.pdf 
 Identifier    ZNB-1999-54b-0807 
 Volume    54