A new method for removal of a 4-methyl group from triterpenes

1971 ◽  
pp. 1419 ◽  
Author(s):  
K. F. Cohen ◽  
R. Kazlauskas ◽  
J. T. Pinhey
Keyword(s):  
New Method ◽  
Methyl Group

A new method of introducing the angular methyl group into fused ring systems

1969 ◽  
Vol 10 (7) ◽  
pp. 561-564 ◽  
Author(s):  
James J. Sims ◽  
L.H. Selman
Keyword(s):  
New Method ◽  
Ring Systems ◽  
Methyl Group ◽  
Fused Ring

A new method for the stereoselective construction of angular methyl group of fuzed cyclic ethers

2010 ◽  
Vol 51 (30) ◽  
pp. 3960-3961 ◽  
Author(s):  
Isao Kadota ◽  
Takayuki Kishi ◽  
Yuka Fujisawa ◽  
Yuji Yamagami ◽  
Hiroyoshi Takamura
Keyword(s):  
New Method ◽  
Cyclic Ethers ◽  
Methyl Group

A new method for the selective halogenation of the methyl group of methyl ketones

Tetrahedron ◽  
1970 ◽  
Vol 26 (22) ◽  
pp. 5191-5194 ◽  
Author(s):  
J.F.W. Keana ◽  
R.R. Schumaker
Keyword(s):  
New Method ◽  
Methyl Ketones ◽  
Methyl Group

ChemInform Abstract: A New Method for the Stereoselective Construction of Angular Methyl Group of Fused Cyclic Ethers.

ChemInform ◽  
2010 ◽  
Vol 41 (46) ◽  
pp. no-no
Author(s):  
Isao Kadota ◽  
Takayuki Kishi ◽  
Yuka Fujisawa ◽  
Yuji Yamagami ◽  
Hiroyoshi Takamura
Keyword(s):  
New Method ◽  
Cyclic Ethers ◽  
Methyl Group

Synthesis of tridentate amine Pt(II) complexes and study of their reactions with purine and pyrimidine bases

1994 ◽  
Vol 72 (5) ◽  
pp. 1225-1229
Author(s):  
Fernande D. Rochon ◽  
Guylaine Laperrière
Keyword(s):  
The Other ◽  
New Method ◽  
Direct Reaction ◽  
Chloro Complexes ◽  
Methyl Group ◽  
Alkyl Groups ◽  
Nmr Techniques ◽  
Pyrimidine Bases ◽  
The One ◽  
Derivatives Of

Complexes of the type [Pt(L)X] where L is a tridentate N ligand and X = Cl or I, were synthesized and characterized. Three of the ligands are N-derivatives of diethylenetriamine, (2-aminoethyl)(N-dimethyl-2-aminoethyl)amine, (2-aminoethyl)(N-diethyl-2-aminoethyl)amine, and (2-aminoethyl)(N-methyl-2-aminoethyl)N-methylamine. The other two ligands are di(3-amino-propyl)amine and (2-aminoethyl)(3-aminopropyl)amine. A new method for the synthesis of the chloro complexes from the direct reaction of the amine with K2[PtCl4] was developed. The reactions of these five compounds with several purine and pyrimidine bases were studied by NMR techniques. The Pt(II) complexes containing two five-membered chelates were shown to be more reactive than the one containing two six-membered rings, while the complex containing one five- and one six-membered chelates showed intermediate reactivity. For the diethylenetriamine derivatives, the complexes containing ligands with two alkyl groups on the same terminal N atom were more reactive than the one containing one methyl group on a terminal N atom and one methyl group on a non-terminal N atom.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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