Carboxylates thiocarboxylates

Ca, Sr, and Ba carboxylate, thiocarboxylate, thiocarboxylate-carboxylate, sulfito, and sulfonate compounds and their monodentate base adducts are white solids, many of which decompose on melting and are only soluble in protic solvents such as alcohols and water.I68-232-240 They are invariably oligomeric or polymeric in the solid state see, for example, Refs. 235, 239, and 240. On thermolysis, the nonfluorinated carboxylates degrade to the metal carbonates while their fluorinated congeners usually form the metal fluorides.212 222-262 269 The thiocarboxylates give mixtures of the metal oxides and sulfates on thermolysis in air.238-239 270 The methyl-thiocarbonate compound, Ca[(OCS)OMe]2(MeOH)3 2, is a dimer in the solid state, soluble in polar coordinating solvents and stable under reduced... 

An acid group — a carboxyl, thiocarboxyl, sulfono, sulfate, phophono, or tetrazole group. 

Treatment of Cp W(NO)Cl2 with (aryl)2Mg (aryl = Ph, o- and jo-tolyl) affords 16e Cp W(NO)(aryl)2 complexes that react with CO, CO2, CS2, or aryl isocyanates to produce rf--diCy, -carboxylate, -thiocarboxylate, and -amide-containing complexes, respectively. In a related system, the water-induced isomerization of CpW(NO)(o-tolyl)2 affords the isomeric oxo(imido) complex CpW(0)(N-o-tolyl)(o-tolyl). Furthermore, the ortho-metalated phosphine complex, Cp W(NO)(H)(j7 -PPh2C6H4) (27), undergoes... 

Dewar and Turchi described the Comforth rearrangement of 5-alkoxyoxazole-4-thiocarboxylates as a potentially general method for the synthesis of 5-thiooxazole-4-carboxylic esters. Specifically, they found that thiol ester 13 underwent thermal isomerization to the corresponding 5-thiooxazole 14 in 94% yield. 

Liquid Crystals Containing Carboxylic or Thiocarboxylic Groups... 

Because of the higher reaction rate, 7V(3)-alkylimidazolium-A ( 1 )-carboxylates or thiocarboxylates have often been used for the synthesis of carbamates and thiocarbamates by the azolide method instead of imidazole-iV-carboxylates. 

In the absence of electron-withdrawing ligands, disilanes possess only a little Lewis acidity consequently, they show a limited propensity to form hypervalent complexes. Starting from the symmetric methylchlorodisilanes ClMe2SiSiMe2Cl and Cl2MeSiSiMeCl2 as well as carboxylic acids and thiocarboxylic acids, Kawashima et al. have prepared rare examples of penta- and hexacoordinated disilene, namely compounds 886-889 (Scheme 125).855 856... 

Macor has developed what appears to be a quite general method for the acylation (protection) of the indole nitrogen using l,r-carbonyldiimidazole (CDI) in the presence of DMAP. Reaction of substituted indoles 98 with CDI presumably occurs to form the imidazolyl amide of indole 99 which upon treatment in situ with either amines, alcohols or thiols affords the desired indole-1-carboxamides, -1-carboxylates, or 1-thiocarboxylates derivatives 100, respectively. 

In 1996 we performed a classical U-4CR of primary amines, aldehydes and isocyanides, but instead of using carboxylic acids we employed thiocarboxylic acids [17]. The reaction leads highly chemoselectively to a-aminoacyl thioamides and no trace of a-aminothioacyl amides is found. This finding is not noteworthy per se and... 

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