Tautomer Ratios Requiring Computation 2-Oxo Derivatives of Pyrrole, Furan, and Thiazole

Tautomer Ratios Requiring Computation 2-Oxo Derivatives of Pyrrole, Furan, and Thiazole 

The log/Cnine values of Table 2.1 can be used in two ways. While no estimates of /Cjeita have been proposed for the parent compound (38, Z = S) those for two five-substituted derivatives are known log/C jeHa -0.6 for R = Me and -0.75 for R = SMe [27]. Any such substituent will help to increase /Cjeita additive 

Tautomeric Ratios Requiring Computation Compounds Containing Contiguous Carbonyi Groups 

This sequence comprises biacetyl (butane-2,3-dione) 41, cyclohexane-1,2-dione 42, and pyrazine-2,3-dione 43 with or without benzofusion to the corresponding quinoxalinedione 44. For the first two at least computation is probably the only way forward, while the third and fourth raise subtle problems of lone pair 

3) n- number of points, r - correlation coefficient, s - standard error, F - Fishers F-statistic. 

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