Enthalpy acyl chlorides

Most of the uncertainty in these enthalpies of formation for the chlorinated acetyl chlorides, RCOC1, arise from uncertainties in the corresponding chlorinated acetic acids, RCOOH after all, it is the high-accuracy (basic, aqueous) hydrolysis reaction that interconnects these species that gives us the acyl chloride enthalpies of formation we use. [See G. M. Moselhy and H. O. Pritchard, J. Chem. Thermodyn., 7,977 (1975).] We note that sufficiently few chlorinated acetate esters enjoy sufficiently accurate enthalpies of formation (as determined by combustion measurements) to allow for comparison of RCOC1 and RCOOR for any R. ... 

Thermodynamic studies of the enthalpy of addition of aldehydes and acyl chlorides to [Rh(P Pr3)2Cl]2 and the hypothetical monomer Rh(PPr3)2Cl gave unsaturated five-coordinate Rh(III) compounds according to equations (16) and (17) and afforded the values shown in Table 17. 

---