Adducts of anthrahydroquinone and anthranol with lignin model quinone methides. 4. Proton NMR hindered rotation studies. Correlation between solution conformations and x-ray crystal structure

1984 ◽  
Vol 49 (18) ◽  
pp. 3337-3340 ◽  
Author(s):  
John Ralph ◽  
Lawrence L. Landucci ◽  
Brian K. Nicholson ◽  
Alistair L. Wilkins
Keyword(s):  
Crystal Structure ◽  
Proton Nmr ◽  
Quinone Methides ◽  
Hindered Rotation ◽  
X Ray ◽  
Solution Conformations ◽  
Lignin Model

Quinones and quinone methides. IX. Oxidation of 2,4-Bis(1,1-dimethylethyl)-6-(4-methoxyphenylmethyl)phenol in alcoholic solvents: Monomeric products and the crystal structure of an unusual dimes, 2-[3,5-Bis(1,1-dimethylethyl)-2-{methoxy-(4-methoxyphenyl)methoxy} phenoxyl-1,5-bis(1,1-dimethylethyl)-3-[methoxy-(4-methoxyphenyl)methyl]benzene

1981 ◽  
Vol 34 (8) ◽  
pp. 1645 ◽  
Author(s):  
L Jurd ◽  
RY Wong
Keyword(s):  
Crystal Structure ◽  
Silver Oxide ◽  
Crystallographic Analysis ◽  
Quinone Methides ◽  
X Ray ◽  
High Yields ◽  
Methyl Benzene

Oxidation of the title benzylphenol (1) with silver oxide in alcoholic media forms benzylic ethers of type (5) in high yields; e.g. oxidation in methanol yields 2,4-bis(1,1-dimethylethyl)-6-[methoxy(4- methoxyphenyl)methyl]phenol(5a) together with an unusual dimer, the structure of which was shown by X-ray crystallographic analysis to be 2-[3,5-bis(1,1-dimethylethyl)-2-{methoxy(4-methoxyphenyl)- methoxy}phenoxy]-1,5-bis(1,1-dimethylethy)-3-[methoxy(4- methoxyphenyl)methyl]benzene (6). The benzylic ethers (5) are convenient intermediates for the syntheses of a variety of compounds related to (1).

Quinones and quinone methides. X. The crystal structure of a dimeric oxidation product from 2,4-Bis(1,1-dimethylethyl)-6-[(4-methoxyphenyl)methyl]phenol

1984 ◽  
Vol 37 (12) ◽  
pp. 2593
Author(s):  
RY Wong ◽  
L Jurd
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Oxidation Product ◽  
Crystallographic Analysis ◽  
Quinone Methides ◽  
X Ray ◽  
A Minor

The molecular structure of a minor oxidation product of the insect sterilant 2,4-bis(1,1-dimethylethyl) 6-[(4-methoxyphenyl)methyl]phenol has been established as (�)-cis-1,3,6,8-tetrakis(1,1-dimethyl-ethyl)-4b,9b-bis(4-methoxyphenyl)-4b,9b-dihydrobenzofuro[3,2-b]benzofuran by means of X-ray crystallographic analysis.

Synthesis and crystal structure of a new homoleptic tetraarylruthenium(IV) complex Ru(2,4,5-Me3C6H2)4

2017 ◽  
Vol 72 (7) ◽  
pp. 523-525
Author(s):  
Chang-Jiu Wang ◽  
Xiu-Li Wu ◽  
Xiu-Fang Ma ◽  
Ai-Quan Jia ◽  
Qian-Feng Zhang
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Column Chromatography ◽  
Proton Nmr ◽  
Proton Nmr Spectroscopy ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
X Ray Crystallography ◽  
Moderate Yield

AbstractTreatment of [Ru(acac)3] (acac−=acetylacetonate) with (2,4,5-Me3C6H2)MgBr, followed by column chromatography in air, afforded the homoleptic tetraaryl-ruthenium(IV) complex [Ru(2,4,5-Me3C6H2)4] (1) in moderate yield. The product was characterized by proton NMR spectroscopy and microanalyses. Its crystal structure has also been established by X-ray crystallography.

Triterpenoids from Hippocratea excelsa. The Crystal Structure of 29-Hydroxytaraxerol

2005 ◽  
Vol 60 (5) ◽  
pp. 577-584 ◽  
Author(s):  
Amilcar R. Aguilar-Gonzalez ◽  
Gonzalo J. Mena-Rejón ◽  
Nayely Padilla-Montaño ◽  
Alfredo Toscano ◽  
Leovigildo Quijano
Keyword(s):  
Crystal Structure ◽  
Spectral Analysis ◽  
Root Bark ◽  
Significant Activity ◽  
X Ray Diffraction ◽  
Quinone Methides ◽  
Heteronuclear Correlation ◽  
Antifungal Activities ◽  
X Ray ◽  
Antimicrobial And Antifungal Activities

The root bark of Hippocratea excelsa afforded a new derivative of β -amyrin, which was identified as its ferulate, together with components new in this species. They were identified as the rare 29-hydroxytaraxerol, 29-hydroxyglutinol, 29-hydroxyfriedelin and the sterol 6β -hydroxystigmast-4- en-3-one. The known triterpene quinone methides pristimerin and tingenone characteristics of this genus, β -sitosterol, trans-polyisoprene, squalene, β -amyrin, and the alditol galacticol characteristic of the Celastraceae were also isolated. The structures were established on the basis of spectral analysis, including homo- and heteronuclear correlation NMR experiments (COSY, DEPT, HMQC and HMBC) and by comparison with data reported in the literature. The structure of 29-hydroxytaraxerol was confirmed by X-ray diffraction. The antimicrobial and antifungal activities of the compounds were studied, but no significant activity was found.

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