810715 min using 345-nm light from the Bausch and Lomb monochromator. Remeasurement of the luminescence spectra showed a decrease in the fluorescence intensity but no phosphorescence.The glass was allowed to thaw and was then refrozen. Use of the phosphoroscope now showed the phosphorescence spectrum of in ethanol. The intensity could not be measured since a clear glass could not be obtained.Photolysis of l a at 77°K. A solution of l a in ethanol was prepared and its fluorescence spectrum measured as described above.Use of the phosphoroscope showed no phosphorescence from the solution. The solution, maintained at 77"K, was irradiated for 2a.12Abstract: 1 -Norbornylamine, 1-apocamphylamine, and 1-adamantylamine have been deaminated using the nitroso-and nitroamide approach. The reaction yields carbonium ions that are reactive enough to abstract chloride ions from solvents such as methylene chloride, probably uia chloronium ion species. The norbornyl ions have a much higher reactivity than the 1-adamantyl ions as shown by the higher ratio of solvent attack to reaction with the negatively charged counterion. Oxygen-1 8 tracer experiments are also reported. The mechanism of deamination is discussed based on these and other results.

The various stereoisomers of 1,2,3-trimethyl-1 -phenylcyclopropane, 2,3-dimethyl-l-phenylcyclopropane, and 2,3-dimethylcyclopropanol methyl ether have been reacted with mercuric trifluoroacetate in methanol and the stereochemistry of both electrophilic and nucleophilic attack has been determined. The electrophilic mercury reacts at the least substituted ring bond (for bonds of equal substitution attack at a cis-substituted bond is preferred over attack at a trans-substituted one). Ring opening occurs in the direction of the more stable carbonium ion, which can lead to either retention or inversion at the site of electrophilic substitution. The opening occurs with substantially complete inversion of configuration at the site of nucleophilic attack. If all ring bonds are identically substituted, as is c«-l,2,3-trimethylcyclopropane, the ring-opened product arises from 62% inversion and 38% retention of configuration at the site of mercury attack and 100% inversion by the methanol. The results seem best to be accounted for by the formation, in the rate-determining step, of a corner-mercurated cyclopropane which ring opens by nucleophilic substitution by solvent.

der Briicken-Substituenten fast gleich und enthielten Banden bei r=2.87 (s, HA), 2.47 (d, J=16.0 Hz, HE), 6.55 (d. J = 16.0 Hz, Hc) und 6.39 (s, N -C H , Um Modelle zum Vergleich mil den NMK-Signalen der Briicken-Substituenten in ( 3 6 ) bis ( 3 e ) 7u haben, wurden die 4-Alkylpyridin-3,5dicarbonsiiurediester (4 b ) bis ( 4 e ) synthetisiert : Behandlung von Pyridin-3,5dicarbon-saure-dimethylester"] mit Grignard-Reagens, Umsetzung des gebildeten 1 ,4-Dihydropyridins1" rnit NaH in Di 1965, 1704, 1709 (1967); 91,4931 (1969); 92, 3669, 3675 (1970).[3] Wir arbeiten mit den N-Methyl-Verbindungen. da sie stiirker aromatisch und stabiler sind als die N-11-Verbindungen

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VI-12, International Union of Crystallography Congress, Kyoto, Japan, 1972. (11) Note Added in Proof. After much experimental difficulty, Professor Lewis provided us with one suitable crystal of Os:(CO)2i. As predicted above, an X-ray analysis shows the seven osmium atoms in a capped octahedral arrangement.

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The NMR spectra of the aza [17]annulenes (3b)-(3e) (100 MHz, CDCI,) were almost identical, except for the bridge substituents, and exhibited bands a t T = 2.87 (s, HA), 2.47 (d, J = 16.0 Hz, HB), 6.55 (d, J = 16.0 Hz, H' ), and 6.39 (s, N-CH,). These spectra show the compounds to Received: June 26, 1972 [Z 684a IE] German version: Angew. Chem. 84.896 (1972) [I] Unsaturated Macrocyclic Compounds. Part 91LPart 90: P. J Bwhv and F. Sondheimer. J. Amer Chem. SOC. 94. 2128 (1972). Received: June 26, 1972 [ Z 684b IE] German version: Angew. Chem. 84.897 (1972) [I] Unsaturated Macrocyclic Compounds. Part 92.-Part 91 : P. J. [Z 689a IE] German version: Angew. Chem. 84.898 (1972) [l] Theory and Application of Photoelectron Spectroscopy, Part 13. This work was supported by the Deutsche Forschungsgemeinschaft and the Fonds der chemischen Industrie. -Part 12. W . Thiel and A . Schweig, Chem. Phys. Lett.. in press.

Beim Erhitzen des Norbornylnitrocarbamats (I) in Methylenchlorid entstehen der Ester (II) und das Chlorid (III).