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4) W. H. Pirkle and S. D. Beare, ibid., in press.transformation. The generality of this technique and its application in the determination of absolute configurations will be the subject of a later report.

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The bonding isomers of triorganostannyl enolates were analyzed by 119Sn NMR spectroscopy. In some cases the existence of an equilibrium between the O-stannyl enolate and C-stannyl derivative was confirmed by variable temperature 119Sn NMR spectra.

The selective 1-substitution reaction of tetrazole was developed by the treatment of 5-substituted 2-(tri-n-butylstannyl)tetrazoles with methyl iodide, methyl p-toluenesulfonate, dimethyl sulfate, or ethyl bromoacetate at room temperature. This selectivity was introduced by blocking the 2-nitrogen with the tri-n-butyltin group against the 2-substitution. In the case of 5-substituted 2-(trimethylstannyl)tetrazoles, a low selectivity was observed. The possible reaction pathways have been discussed.