The above-mentioned results are quite different from those obtained when s-triazine is reacted with 0-methylisourea and S-methylisothiourea and guanidine. Three different products i.e. 2-methoxy-, 2-(methy1thio)-and 2-amino-s-triazine are formed respectively. Why in these reactions the intermediate 11 (replace CR, by N) always recyclizes by loss of NH, is unclear at this moment Experimental partMelting points are uncorrected. The PMR spectra were recorded on a Jeol JNM-C 60 spectrometer using tetramethylsilane (T.M.S.) as internal standard. The I5N contents were measured on an A.E.I. MS 902 mass spectrometer.

Observations of Raman optical activity in CH, and CD, deformation modes of (lS)-4,4-dideuterioadamantan-2-one reinforce the expectation that vibrational optical activity measurements will become a powerful new means of studying the stereochemistry of molecules that owe their chirality to isotopic substitution.

X-Ray data for dispiro(adamantane-2,3'-[1,2]-unusual stability of the dispiro-1,2-dioxetan (I) .4 X-Ray data for this class of compounds will be useful in any careful evaluation of the steric requirements of 1,2-dioxetans in bioluminescent ~y s t e r n s . ~ Our own need for these THE chemiluminescent decomposition of 1,2-dioxetans is data is evident from our recent studies.2 We therefore the subject of continuing study.l v 2 Structural parameters report the X-ray crystal structure of dispiro (adamantanecan be helpful in substantiating the proposed reason3 for the 2,3'-[1,2]dioxetan-4', 2''-adamantane) (I). dioxetan-4',2"-adamantane) are presented and support suggestions regarding the reasons for its unusual stability.

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