Preparation of mesostructured silica/anodic alumina composite membranes in mild conditions using acetic acid

2008 ◽  
Vol 112 (1-3) ◽  
pp. 603-611 ◽  
Author(s):  
Kazuyuki Maeda ◽  
Katsuya Ichinose ◽  
Tsutomu Yamazaki ◽  
Takeyuki Suzuki
Keyword(s):  
Acetic Acid ◽  
Composite Membranes ◽  
Anodic Alumina ◽  
Mesostructured Silica ◽  
Mild Conditions ◽  
Alumina Composite

An unusual reaction of a bridged triterpenoid α-diketone with acetic anhydride

1991 ◽  
Vol 56 (12) ◽  
pp. 2917-2935 ◽  
Author(s):  
Eva Klinotová ◽  
Václav Křeček ◽  
Jiří Klinot ◽  
Miloš Buděšínský ◽  
Jaroslav Podlaha ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Acetic Anhydride ◽  
Spectral Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mild Conditions ◽  
Condensation Products ◽  
Unsaturated Lactones ◽  
C Nmr

3β-Acetoxy-21,22-dioxo-18α,19βH-ursan-28,20β-olide (IIIa) reacts with acetic anhydride in pyridine under very mild conditions affording β-lactone IVa and γ-lactones Va and VIIa as condensation products. On reaction with pyridine, lactones Va and VIIa undergo elimination of acetic acid to give unsaturated lactones VIIIa and IXa, respectively. Similarly, the condensation of 20β,28-epoxy-21,22-dioxo-18α,19βH-ursan-3β-yl acetate (IIIb) with acetic anhydride leads to β-lactone IVb and γ-lactone Vb; the latter on heating with pyridine affords unsaturated lactone VIIIb and 21-methylene-22-ketone Xb. The structure of the obtained compounds was derived using spectral methods, particularly 1H and 13C NMR spectroscopy; structure of lactone IVa was confirmed by X-ray diffraction.

Preparation of novel composite membranes for the pervaporation separation of water–acetic acid mixtures

2006 ◽  
Vol 285 (1-2) ◽  
pp. 420-431 ◽  
Author(s):  
Srikant S. Kulkarni ◽  
Subhashchandra M. Tambe ◽  
Arjumand A. Kittur ◽  
Mahadevappa Y. Kariduraganavar
Keyword(s):  
Acetic Acid ◽  
Composite Membranes ◽  
Pervaporation Separation

scholarly journals Highly efficient epoxidation of vegetable oils catalyzed by a manganese complex with hydrogen peroxide and acetic acid

2019 ◽  
Vol 21 (9) ◽  
pp. 2436-2447 ◽  
Author(s):  
Jianming Chen ◽  
Marc de Liedekerke Beaufort ◽  
Lucas Gyurik ◽  
Joren Dorresteijn ◽  
Matthias Otte ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Vegetable Oils ◽  
Manganese Complex ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Catalytic Epoxidation

A highly efficient catalytic epoxidation of vegetable oils under mild conditions was developed, using a homogeneous Mn catalyst and H2O2 as oxidant.

Peptide syntheses with the 2,4,6-trimethylbenzyl esters of L-asparagine and L-glutamine

1967 ◽  
Vol 20 (2) ◽  
pp. 365 ◽  
Author(s):  
FHC Stewart
Keyword(s):  
Acetic Acid ◽  
Amino Acid ◽  
Hydrogen Chloride ◽  
Hydrogen Bromide ◽  
Amino Acid Esters ◽  
Mild Conditions ◽  
Acid Esters

The 2,4,6-trimethylbenzyl esters of L-asparagine and L-glutamine have been obtained as the crystalline hydrochlorides by treatment of the o- nitrophenylsulphenyl amino acid esters with methanolic hydrogen chloride. These hydrochlorides were used in the synthesis of several benzyloxycarbonyl peptide 2,4,6-trimethylbenzyl esters, which were converted into the corresponding free peptides by the action of hydrogen bromide in acetic acid under mild conditions.

Exceptionally strong and robust millimeter-scale graphene–alumina composite membranes

2014 ◽  
Vol 25 (35) ◽  
pp. 355701 ◽  
Author(s):  
Maria Berdova ◽  
Alexander Pyymaki Perros ◽  
Wonjae Kim ◽  
Juha Riikonen ◽  
Tuomo Ylitalo ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Alumina Composite

scholarly journals Poly(vinyl chloride) polyacrylonitrile composite membranes for the dehydration of acetic acid

1993 ◽  
Vol 81 (1-2) ◽  
pp. 57-70 ◽  
Author(s):  
G.H. Koops ◽  
J.A.M. Nolten ◽  
M.H.V. Mulder ◽  
C.A. Smolders
Keyword(s):  
Acetic Acid ◽  
Vinyl Chloride ◽  
Composite Membranes ◽  
Poly Vinyl Chloride
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