thiourea वाक्य
उदाहरण वाक्य
मोबाइल
- These minor differences suggest that the properties emergent from the delocalized N-lone pair and destabilization C = S and C = Se ? bond in thiourea and selenourea will also be similar.
- It is proposed that activation occurs via H bonding of both the nitronate and the ester to the thiourea catalyst and explains the interesting selectivity for the " E " ester.
- The nitro and cyano groups are sufficiently electronegative to reduce the pK a of the neighboring nitrogens to the same acidity of the thiourea group, hence preserving the activity of the drug in a physiological environment.
- Some compounds can considerably increase or decrease the solubility of AgX . Examples of compounds that increase the solubility include : cyanide, thiocyanate, thiosulfate, thiourea, amines, ammonia, sulfite, thioether, crown ether.
- The pharmaceuticals thiobarbituric acid and sulfathiazole are prepared using thiourea . 4-Amino-3-hydrazino-5-mercapto-1, 2, 4-triazole is prepared by the reaction of thiourea and hydrazine.
- The pharmaceuticals thiobarbituric acid and sulfathiazole are prepared using thiourea . 4-Amino-3-hydrazino-5-mercapto-1, 2, 4-triazole is prepared by the reaction of thiourea and hydrazine.
- Thiourea catalysts with pendant chiral backbones have shown to activate systems with tethered nitroalkane and ester motifs to induce asymmetric IMA . The utility of this transformation was demonstrated in the synthesis of cyclic ? amino acid precursors ( figure 1 ).
- Most conventionally used accelerators are problematic when CR rubbers are cured and the most important accelerator has been found to be ethylene thiourea ( ETU ) which, although being an excellent and proven accelerator for polychloroprene, has been classified as reprotoxic.
- The reaction is accomplished when hydrogen is released by a reducing agent, normally sodium hypophosphite ( Note : the hydrogen leaves as a hydride ion ) or thiourea, and oxidized, thus producing a negative charge on the surface of the part.
- To date various organic transformations are organocatalyzed through double hydrogen-bonding " N, N "'- bis [ 3, 5-bis ( trifluoromethyl ) ] phenyl thiourea at low catalyst loadings and in good to excellent product yields.
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