Zobrazeno 1 - 10
of 115
pro vyhledávání: '"Trevor A. Crabb"'
Publikováno v:
Tetrahedron. 56:10005-10009
11-Hydroxy-1,3,5,7,11-pentamethyl-2,4,6,8-tetraoxatricyclo[3.3.3.0 (3,7) ]undecan-9-one adopts an equilibrium (in CD 2 CI 2 at −90°C) between ca. 68% of the conformer with a pseudo-axial C-11 methyl substituent and ca. 32% of the alternative pseud
Publikováno v:
Phytochemistry. 52:1105-1109
From the acetone extract of the dry roots of Salvia glutinosa, 15 diterpenoids were isolated and characterised. Of these, 12-deoxydanshenxinkun B and dihydroisotanshinone II are novel compounds and isotanshinone II is a new natural product. The aceto
Publikováno v:
Phytochemistry. 51:809-812
From the roots of Salvia nutans seven diterpenoids have been isolated and characterized, primarily from spectroscopic data. Three of the compounds are new 12-deoxyroyleanones (12-deoxy-6,7-dehydroroyleanone, 12-deoxy-6-hydroxy-6,7-dehydroroyleanone a
Publikováno v:
Tetrahedron. 55:5867-5874
Along with the major product (1) by-products of the reaction between butan-2,3-dione and hydrochloric acid were isolated. These include (2), (3), (7) and (9).
Publikováno v:
Journal of Applied Phycology. 8:211-215
Formaldehyde, as its dimedone adduct (formaldemethone), has been isolated fromAscophyllum nodosum and characterised by thin-layer and overpressured layer chromatography, and from proton nuclear magnetic resonance spectroscopic and electron impact mas
Autor:
Juan Carmona, Peter D. Cary, Trevor A. Crabb, Asmita V. Patel, Gerald Blunden, Pablo Meléndez, Manuel Costa, Irama Ramírez, Simon L. Croft, Manuel Jimenez, Alfredo Carabot
Publikováno v:
Phytochemistry. 64:645-647
From the aerial parts of Cissampelos pareira L. (Menispermaceae), a chalcone-flavone dimer has been isolated which, mainly from NMR spectroscopic and MS data, was proved to be 2-(4-hydroxy-3-methoxyphenyl)-7-(4-methoxyphenyl)-6-(2-hydroxy-4,6-dimetho
Publikováno v:
Phytochemistry. 35:665-669
From extracts of the fungus Alternaria alternata cultured on rice, five dibenzo-α-pyrones were isolated. In addition to the known compounds alternariol, alternariol monomethyl ether and altenuene, two new isomers of altenuene were characterized. Fro
Publikováno v:
Phytochemistry. 35:125-133
Incubation of (25 R )-5α-spirostane-3β,12β-diol (rockogenin) with the fungus Cunninghamella elegans led to the formation of (25 R )-7β,12β-dihydroxy-5α-spirostan-3-one, (25 R )-5α-spirostan-3β,7β,12β-triol and (25 R )-5α-spirostan-3β,7α,
Publikováno v:
Magnetic Resonance in Chemistry. 31:505-508
The positions of conformational equilibria in the four diastereoisomers of 8,9,11,11a,11b,12,13-octahydro-7aH-quino [1,2-c] [1,3] benzoxazines were investigated using 13C and 1H NMR spectroscopy. Comparison of the NMR chemical shifts of these isomers
Publikováno v:
Magnetic Resonance in Chemistry. 31:63-67
The reaction between 6- and 7-ketocyclopenta [d] [1,3]dioxane and methyl-phenylmagnesium bromide gave in each case only one isomer of the 6-hydroxy-6-methyl-phenyl- and 7-hydroxy-7-methyl-phenylcyclopenta [d] [1,3]dioxanes. The configurations of thes