A New Method of Dimroth Rearrangement in Fused Triazolo[1,5-d]-1,2,4-triazine

2014 ◽  
Vol 52 (5) ◽  
pp. 1411-1414 ◽  
Author(s):  
B. E. Ezema ◽  
L. E. S. Akpanisi ◽  
C. G. Ezema ◽  
A. E. Onoabedje
Keyword(s):  
New Method ◽  
Dimroth Rearrangement

A new method for preparation of 1-(4-substituted phenyl)-6-phenyl-2-thiouracils via cyclization of N-(4-substituted phenyl)-N'-3-phenylpropenoylthioureas and Dimroth rearrangement of 2-(4-substituted phenylimino)-6-phenyl-5,6-dihydro-4H-1,3-thiazin-4-ones

1987 ◽  
Vol 52 (9) ◽  
pp. 2260-2265 ◽  
Author(s):  
Milan Dzurilla ◽  
Peter Kutschy ◽  
Dušan Koščík
Keyword(s):  
Boron Trifluoride ◽  
Lithium Hydride ◽  
New Method ◽  
Dimroth Rearrangement ◽  
Reaction Conditions

N-(4-Substituted phenyl)-N'-3-phenylpropenoylthioureas treated with lithium hydride afforded 1-(4-substituted phenyl)-6-phenyl-2-thiouracils; these could also be obtained by Dimroth rearrangement of 2-(4-substituted phenylimino)-6-phenyl-5,6-dihydro-4H-1,3-thiazin-4-ones under the same reaction conditions. 2-(4-Substituted phenylimino)-6-phenyl-5,6-dihydro-4H-1,3-thiazin-4-ones were synthesized from the corresponding thioureas under catalysis of boron trifluoride in chloroform.

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.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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