Syntheses of 5-n-Alkylresorcinol dimethyl ethers and 1,14-Bis(3,5-dimethoxyphenyl) tetradecane via β-keto sulphone intermediates

1973 ◽  
Vol 26 (4) ◽  
pp. 799 ◽  
Author(s):  
JR Cannon ◽  
PK Cheong ◽  
CJ Fallick ◽  
BH Hamilton ◽  
IA McDonald ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Dimethyl Ether ◽  
Clemmensen Reduction

Alkylation of 3,5-dimethoxy-α-(methylsulphonyl)acetophenone followed by reduction of the resulting monoalkylated products with zinc and acetic acid afforded the corresponding 5-n-acylresorcinol dimethyl ethers. Hydrogenolysis of 5-n-undecoylresorcinol dimethyl ether, prepared in this way, yielded 5-n-undecylresorcinol dimethyl ether. ��� Alkylation of 1-(methylsulphonyl)alkan-3-ones with 3,5- dimethoxybenzyl bromide gave a mixture of mono- and di-substituted products. Clemmensen reduction of the monosubstituted products afforded 5-n-alkylresorcinol dimethyl ethers directly. ��� These reactions have been adapted to provide two syntheses of 1,14- bis(3,5-dimethoxyphenyl)tetradecane.

Analysis on Pyrolysis Products of Phyllostachys heterocycla in Heat Charring

2011 ◽  
Vol 704-705 ◽  
pp. 592-595
Author(s):  
Zhong Feng Zhang ◽  
Xian Yan Zhou ◽  
Qing Zhi Ma
Keyword(s):  
Acetic Acid ◽  
Formic Acid ◽  
Dimethyl Ether ◽  
Carbon Disulfide ◽  
Added Value ◽  
Chemical Components ◽  
Pyrolysis Products ◽  
Propenoic Acid ◽  
Phyllostachys Heterocycla ◽  
Main Components

Phyllostachys heterocyclabegins to be used for black bamboo with high added value. However, the pyrolysis products were severely wasted. Therefore, the chemical components fromPhyllostachys heterocyclawere identified by TD-GC/MS after concentration. The main constituents of 150°С volatiles were acetic acid (46.75%), carbon disulfide (4.90%), 2-furanmethanol (4.10%), benzofuran, 2,3-dihydro-(3.63%), formic acid (3.27%), 2-propanone, 1-hydroxy-(2.80%), 2-propenoic acid, 2-hydroxyethyl ester (2.64%), dimethyl ether (2.15%), .beta.-pinene (1.84%), camphor (1.71%), etc. The main constituents of 180°С volatiles were acetic acid (20.66%), benzofuran, 2,3-dihydro-(14.49%), furfural (8.86%), formic acid (8.37%), 2-furanmethanol (4.17%), 4h-pyran-4-one, 2,3-dihydro-3,5-dihydroxy-6-methyl-(3.74%), 2(5h)-furanone (2.83%), 2-propanone, 1-hydroxy-(2.74%), etc. The main components of pyrolysis products of Phyllostachys heterocycla in heat charring could also be used as bioenergy materials, but were not only abundant and healthy to human.

Gas-Phase Methanol Carbonylation for Dimethyl Ether and Acetic Acid Co-Production

2012 ◽  
Vol 554-556 ◽  
pp. 760-763 ◽  
Author(s):  
Bin Ru ◽  
Xin Bao Li ◽  
Ling Jun Zhu ◽  
Guo Hui Xu ◽  
Yue Ling Gu
Keyword(s):  
Acetic Acid ◽  
Gas Phase ◽  
Dimethyl Ether ◽  
Reaction Temperature ◽  
Catalyst Surface ◽  
Methanol Conversion ◽  
Methanol Carbonylation ◽  
Synthesis Of Dimethyl Ether

Gas-phase methanol carbonylation over HMOR catalyst was investigated for the synthesis of dimethyl ether (DME) and acetic acid (HOAc). The results revealed that the selectivity of DME reached 98% and the methanol conversion was 45% under the reaction temperature of 493K. While, the selectivity of HOAc was 30% and the methanol conversion reached 80% when reaction temperature was increased to 573K. TEM, SEM, XRD, N2 physisorbtion, XPS and TG-DTG measurements were performed to characterize the texture and structure of the catalyst. Serious coking on the catalyst surface significantly limited the utilization of unmodified HMOR catalyst in the reaction.

Ectodesmata as Revealed By Freeze-Etch Preparations of Plant Epidermal Cell Walls

1973 ◽  
Vol 31 ◽  
pp. 468-469
Author(s):  
N.C. Lyon ◽  
W. C. Mueller
Keyword(s):  
Electron Microscopy ◽  
Acetic Acid ◽  
Nitric Acid ◽  
Oxalic Acid ◽  
Light Microscopy ◽  
Epidermal Cell ◽  
Cell Walls ◽  
Plant Viruses ◽  
Plant Leaves ◽  
Thin Sections

Schumacher and Halbsguth first demonstrated ectodesmata as pores or channels in the epidermal cell walls in haustoria of Cuscuta odorata L. by light microscopy in tissues fixed in a sublimate fixative (30% ethyl alcohol, 30 ml:glacial acetic acid, 10 ml: 65% nitric acid, 1 ml: 40% formaldehyde, 5 ml: oxalic acid, 2 g: mecuric chloride to saturation 2-3 g). Other workers have published electron micrographs of structures transversing the outer epidermal cell in thin sections of plant leaves that have been interpreted as ectodesmata. Such structures are evident following treatment with Hg++ or Ag+ salts and are only rarely observed by electron microscopy. If ectodesmata exist without such treatment, and are not artefacts, they would afford natural pathways of entry for applied foliar solutions and plant viruses.

Increased expression of an amino acid transporter LAT1 in healing of acetic acid-induced chronic gastric ulcer in rats

2001 ◽  
Vol 120 (5) ◽  
pp. A153-A153
Author(s):  
S MIYAMOTO ◽  
K KATO ◽  
Y ISHII ◽  
S ASAI ◽  
T NAGAISHI ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Gastric Ulcer ◽  
Amino Acid ◽  
Amino Acid Transporter ◽  
Chronic Gastric Ulcer ◽  
Acid Transporter
Sign in / Sign up

Export Citation Format

Share Document