Notes 1741 tion is probably due to the formation of diand trisubstituted borazines which decompose more readily than the monosubstituted derivative. The formation of polysubstituted borazines is indicated from the observation that alcohol was always consumed faster than borazine even when the initial alcohol to borazine ratio was greater than unity.The most abundant ions produced by fragmentation in the mass spectrum of borazine are B3N3H6+, B3N2-H2+, B2N2H3+, B2NH2+, and BNH3+.7 In the mass spectrum of B-monomethoxy-and B-monoethoxyborazine major ion fragments occur in positions corresponding to the base groups in borazine shifted to higher masses due to the substitution of an alkoxy group for an H atom. Ion fragments in the alkoxy derivatives also arise by splitting off segments of the side chain.
GERMYL METHYL ETHER AND GERMYLMETHYL METHYL ETHER 1989 metal-ammonia solutions, we propose the mechanism 21 --23 e . 4-GeHI -3 GeH8 -t. H 2BIn this mechanism,5 one would expect the rate of formation of amide ion (which catalyzes the Ge(NH)z-producing reaction), relative to the rate of reaction 4, to increase with increasing metal concentration. The mechanism thus explains the excess hydrogen formed at high metal concentrations. The same mechanism is applicable to the analogous reactions of silane and stannane if we assume that, on going from SiH4 to GeH4 to SnH4, the protonic acidity increases and the susceptibility to displacement of hydride ion by amide ion decreases.Acknowledgments.-This work was sponsored by the U. S. Atomic Energy Commission and the National Science Foundation.(24) The rate-determining step in the formation of Ge(NHda is probably reaction 8, because the germanium would become more positive as the number of amino groups increases (inductive effect) and, consequently, more susceptible to nucleophilic attack by amide.26 From the data in Table 11, we calculate ks/ks = 0.18. (25) F. Rijkens and G. J. M. Van Der Kerk, "Investigations in the Field ofThe synthesis, characterization, and some properties of GeH30CH3 and GeH3CH20CH8 are described. The donor properties of the compounds have been investigated by an infrared hydrogen-bonding study. Germyl methyl ether acts as a stronger Lewis base than (C&)zo, and GeHaCHzOCHa acts as a weaker Lewis base than CH3CHzOCH3, with methanol as reference acid. The results are compared with data for the corresponding silicon compounds and discussed in terms of electronegativity and rr-bonding considerations.
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