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The proton chemical shifts of aromatic compounds are strongly concentration dependent. Moreever, for molecules with a dipole moment a temperature dependence of the proton chemical shifts is observed. For hemellitone, p-methylanisole, o-chlortoluene, p-chlortoluene, pyrrole and N-methyl-pyrrole the enthalpies of a dipole-dipole association between -0,7 and -1,8 Kcal could be estimated by NMR measurements combined with the temperature dependence in the whole range of the molefraction (0 → 1).

AbstractAlkyldifluorophosphites, ROPF2 (R = p-substituted benzyl group, neopentyl, 1-adamantyl) have been obtained by a new method, involving reaction of the appropriate alkyl trimethylsilylether, ROSiMe3 with chlorodifluorophosphine, PF2Cl. Reactions of these difluorophosphites with platinum(II) complexes of the type [L2PtCl2] (L = PEt3, PPh3) led to products such as trans-[L2PtCl(POF2)] and {[p-XC6H4CH2PPh3]+}2[Pt(POF2)4]2-, (X = H, Me, Cl, NO2). The ease of carbon-oxygen cleavage in ROPF2 is characteristically related to the nature of the leaving group, R.

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