In connection with studies on long-chained types, an examination has been made of some organometallic compounds.Sodium, Potassium, and Calcium. The RNa, RK and RCal types examined are insoluble in hydrocarbons including the kerosene fractions. Incidental to the preparation of these RM compounds, there are formed R(-H), RH, and R-R hydrocarbons as a consequence of disproportionation and coupling reactions. The preparation of n-dodecylsodium in low yields in ether is of interest because of the ready cleavage of ether by simpler alkylsodium compounds.Lithium. The RLi compounds (where R = C12H25, C14H29, Ci6H33, and CisHs?) can be prepared in several solvents, but the one of choice appears to be petroleum ether (b.p. 60-70°). The RC1 compounds are most suitable for the preparation of the RLi types. 1,2,3-Trimethoxybenzene is metalated by n-dodecyllithium in an ort/io-position, to give subsequent to carbonation 2,3,4trimethoxybenzoic acid.Mercury. The long-chained organomercury halides are not particularly suitable as derivatives for rigid differentiation of contiguous even-membered types. For example, Cl6H33HgCl melts at 114-115°, CiSH37HgCl melts at 115-116°, and a mixture of equal parts of these RHgCl compounds melts at 113°. The Experimental Part contains a discussion of some regularities in melting points, and also a broad tabular comparison of mixed melting points. is 206.4 (calculated, 209.26).Mixed melting points. Approximately equal quantities of various pairs of mercury, lead, and tin compounds were mixed and the melting points were determined. The results are shown in Table IV.

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