crystal orientation of the three rings. The carbon atoms Cll-C15 form the top ring and the carbons C2!-C25 the bottom ring. The methyl group (C31) is only -0.008 A from the plane of the C2Ba ring.

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Amine-boranes will react cleanly with halocarbons to give amine-haloboranes and an alkane. Polar reactions are observed with organic halides, such as chlorotriphenylmethane, which form carbonium ions readily, with reactivity increasing with the stability of the carbonium ion. Free-radical reactions are observed with CC14 or CCUBr; they can be initiated with benzoyl peroxide. 4-Methylpyridine-monochloroborane and -dichloroborane have been synthesized. In a recent paper1 evidence was presented which suggested that substitution of halogen for hydrogen in amine-boranes may proceed either by a polar or by a free-radical pathway, depending on the nature of the (1) J. W. Wiggins and G. E. Ryschkewitsch, Inorg. Chim. Acta, 4, 33 (1970). chlorinating agent. During a subsequent investigation of the reaction between dimethylchloramine and amineboranes,2 it was observed that the solvent, CC14, could become involved in the reaction and act as a chlorinat-(2) V.