Novel and Efficient Transfer Hydrogenolysis of Protected Peptides Using Recyclable Polymer-Supported Hydrogen Donor

2005 ◽  
Vol 11 (2) ◽  
pp. 153-157 ◽  
Author(s):  
K. Abiraj ◽  
G. R. Srinivasa ◽  
D. Channe Gowda
Keyword(s):  
Hydrogen Donor ◽  
Polymer Supported ◽  
Protected Peptides ◽  
Efficient Transfer

Polymer-Supported Formate and Magnesium: An Efficient Transfer Hydrogenation System for the Facile Reduction of Azo Compounds

2005 ◽  
Vol 2005 (2) ◽  
pp. 123-125 ◽  
Author(s):  
G. R. Srinivasa ◽  
K. Abiraj ◽  
D. Channe Gowda
Keyword(s):  
Efficient Method ◽  
Room Temperature ◽  
Low Cost ◽  
Selective Reduction ◽  
Hydrogen Donor ◽  
Transfer Hydrogenation ◽  
Azo Compounds ◽  
Magnesium Powder ◽  
Polymer Supported ◽  
Efficient Transfer

A mild and efficient method was developed for the chemo-selective reduction of azo compounds to the corresponding amine/s using recyclable polymer-supported formate as hydrogen donor in the presence of low cost magnesium powder at room temperature.

Palladium-catalyzed simple and efficient hydrogenative cleavage of azo compounds using recyclable polymer-supported formate

2005 ◽  
Vol 83 (5) ◽  
pp. 517-520 ◽  
Author(s):  
Keelara Abiraj ◽  
Gejjalagere R Srinivasa ◽  
D Channe Gowda
Keyword(s):  
Functional Groups ◽  
Room Temperature ◽  
Hydrogen Donor ◽  
Transfer Hydrogenation ◽  
Azo Compounds ◽  
Catalytic Transfer Hydrogenation ◽  
Palladium Catalyzed ◽  
Catalytic Transfer ◽  
Polymer Supported

Palladium-catalyzed room temperature transfer hydrogenation of azo compounds using recyclable polymer-supported formate as the hydrogen donor produces corresponding amine(s) in excellent yields (88%–98%). This method was found to be highly facile with selectivity over a number of other functional groups such as halogen, alkene, nitrile, carbonyl, amide, methoxy, and hydroxyl.Key words: azo compounds, catalytic transfer hydrogenation, polymer-supported formate, 10% Pd-C, amines.

Ethanol as Hydrogen Donor: Highly Efficient Transfer Hydrogenations with Rhodium(I) Amides

2008 ◽  
Vol 47 (17) ◽  
pp. 3245-3249 ◽  
Author(s):  
Theo Zweifel ◽  
Jean-Valère Naubron ◽  
Torsten Büttner ◽  
Timo Ott ◽  
Hansjörg Grützmacher
Keyword(s):  
Hydrogen Donor ◽  
Highly Efficient ◽  
Efficient Transfer

Simple and Efficient Reduction of Aromatic Nitro Compounds Using Recyclable Polymer-Supported Formate and Magnesium

2005 ◽  
Vol 58 (2) ◽  
pp. 149 ◽  
Author(s):  
Keelara Abiraj ◽  
Gejjalagere R. Srinivasa ◽  
D. Channe Gowda
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
Nitro Compounds ◽  
Hydrogen Donor ◽  
Hydroxyl Groups ◽  
Chromatographic Purification ◽  
Aromatic Nitro Compounds ◽  
Efficient Reduction ◽  
Polymer Supported ◽  
Aromatic Nitro

Aromatic nitro compounds were chemoselectively reduced to the corresponding amines using recyclable polymer-supported formate as a hydrogen donor in the presence of low-cost magnesium powder at room temperature. Use of the immobilized hydrogen donor affords the product amine in excellent yield (90–97%) without the need for any chromatographic purification steps. This method was found to be highly facile with selectivity over several other functional groups, such as halogen, alkene, nitrile, carbonyl, ester, amide, methoxy, phenol, and hydroxyl groups.

Use of a Backcross Population to Target Genes Controlling Androgenesis in Potato

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 484b-484
Author(s):  
Tatiana Boluarte ◽  
R.E. Veilleux
Keyword(s):  
Target Genes ◽  
Microspore Embryogenesis ◽  
Solanum Chacoense ◽  
Backcross Population ◽  
Regenerated Plants ◽  
Preliminary Study ◽  
Two Phases ◽  
Anther Culture Response ◽  
Segregating Population ◽  
Efficient Transfer

Genes for anther culture response (ACR) need to be mapped to enable efficient transfer of the trait to unresponsive but agronomically desirable clones. The objective of this study was to find extremes for ACR in a segregating population to target genes controlling this trait using bulk segregant analysis. Populations resulting from backcrosses (BC) of a diploid interspecific clone [CP2: Solanum chacoense (chc: low ACR) and S. phureja (phu: high ACR)] to both parents were used to characterize two phases of androgenesis in a preliminary study: microspore embryogenesis and embryo regeneration. Among 24 plants from each BC, consistently high- and low-responding genotypes with regard to embryo production were identified. Low ACR clones in each BC produced from 0.0–0.1 embryos per anther (EPA), whereas high ACR clones in the chc and phu BC produced from 1.4–2.9 and 2.8–7.5 EPA, respectively. The frequency of embryos regenerating into plants ranged from 3% to 20% for the chc high EPA clones and 12% to 64% for the phu high EPA clones. Ploidy of regenerated plants was determined by flow cytometry. The frequency of monoploid regenerants among the high EPA clones ranged from 3.6% to 68%. Since these populations showed sufficient genetic variation for ACR, a series of statistically designed experiments were conducted to develop high and low ACR bulks. From four groups of phenotypically characterized PBC plants, a high ACR bulk (–x = 4.9 EPA; n = 14) and a low ACR bulk (–x = 0.12 EPA; n =9) were constructed.

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