Home About us Contact
|
Home About us Contact | ||
|
|
||
Improved Preparation (improved + preparation)
Selected AbstractsAn Improved Preparation of D -Glyceraldehyde 3-Phosphate and Its Use in the Synthesis of 1-Deoxy- D -xylulose 5-PhosphateHELVETICA CHIMICA ACTA, Issue 9 2010Heng Li Abstract D -Glyceraldehyde 3-phosphate (=D -GAP; 2) was prepared by an improved chemical method (Scheme,2), and it was then employed to synthesize 1-deoxy- D -xylulose 5-phosphate (=DXP; 3) which is enzymatically one of the key intermediates in the MEP (4) terpenoid biosynthetic pathway (Scheme,1). The recombinant DXP synthase of Rhodobacter capsulatus was used to catalyze the condensation of D -glyceraldehyde 3-phosphate (2) and pyruvate (=2-oxopropanoate; 1) to produce the sugar phosphate 3 (Scheme,2). The simple two-step chemoenzymatic route described affords DXP (3) with more than 70% overall yield and higher than 95% purity. The procedure may also be used for the synthesis of isotope-labeled DXP (3) by using isotope-labeled pyruvate. [source] Improved Preparation and Structural Investigation of 4-Aryl-4-oxo-2-hydroxy-2-butenoic Acids and Methyl Esters.CHEMINFORM, Issue 47 2004Cedric Maurin Abstract For Abstract see ChemInform Abstract in Full Text. [source] An Improved Preparation of 4-Amino-3-mercaptobenzoic Acid.CHEMINFORM, Issue 2 2004Robert C. Lang Abstract For Abstract see ChemInform Abstract in Full Text. [source] Improved preparation of 3-(1,1-dimethylallyl)decursinolJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 3 2009Xiangrui Jiang An improved preparation method of 3-(1,1-dimethylallyl)decursinol from inexpensive commercially available start material was described. In the cyclization of 13, silica gel was used as catalyst to give 1 with high purity and satisfying yield. J. Heterocyclic Chem., 46, 560 (2009). [source] Synthesis of Polyanilines Bearing Optically Active SubstituentsMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 12 2006Hiromasa Goto Abstract Summary: Optically active polyanilines were prepared by an interfacial polymerization with (NH4)2S2O8 in a water/perchloric acid/chloroform system. The pristine polymer obtained in this way is in the oxidized (doped) form. The polymers display the mirror-image Cotton effect. The doping process in solution allows a change in the circular dichroism of the polymer. The procedure has great potential in the improved preparation of durable optoelectrical devices based on the good film-forming properties of chiral polymers. CD spectra of R - P2 (solid line) and S - P2 (dashed line) in 4.0,×,10,4M THF solution. [source] | ||||||||||