The enthalpies of formation of 1,1-diphenylstannacyclopentane and 1,1-diphenylstannacyclohexane and some associated tin-carbon bond-enthalpy terms

Chapter 8. Thermochemistry

“…~~~ Carson et af. 228 applied similar techniques and analysis to both Ph2Sn-(CH2)4 and Ph2Sn-(CH2)* and there was ,no evidence of strain-energy in either of these cyclic compounds. Kirklin and Domalski have made rotating-bomb measurements on phosphorus compounds with complete analyses of the final products and report A, H" (cr) for triphenylphosphine and triphenylphosphine these authors also report A, H" for triphenylph~sphate.~~' Barnes et al231 report A, H" for triphenylarsine oxide and derived D(Ph3As-0) as 429.3 f 30.5 kJmol-I, which may be compared with D(Ph3P-0) = 566.6f 8.4 kJ mol-'.…”

Tin

“…2 ® 7 Some enhanced reactivity is also apparent in the diphenylstannacyclopentane 209 (although this does not show up in bond dissociation energies as measured by combustion calorimetry). 219 In aqueous alcohol, diphenylstannacyclopentane and phenylchlorostannacyclopentane react with air to give peroxides and thence the 4-hydroxybutyltin hydroxides (Scheme 40). 220 Stannacyclopentanes and stannacyclohexanes can also be prepared by exchange between phenyl and chloro ligands on tin, catalysed by zinc chloride; by this method, and by halogenodephenylation of the tin by halogen or hydrogen halide, phenylhalogeno-and dihalogeno-stannacyclopentanes and -stannacyclohexanes have been prepared, as shown in Scheme 40.…”