actinomycin D,26 and oxytocin.27 Only in the case of c2/cZo-(Pro-Gly)s in methylene chloride do these rules fail to agree with previous conclusions, and this failure (26) D. J. Patel, et ah, unpublished results. (27) A.
it is obvious that there is no clear evidence for the presence of any significant diamagnetic ring current.(14) We have not yet excluded the possibility that a second double bond isomer of 1 in addition to 5 was produced and isomerized to an as yet uncharacterized CsHsO compound. The structural assignment of 5 is solely on the basis of the selection rule.(15) S. Masamune and N. T. Castellucci, Angew. Chem. Intern. Ed. Engl, 3, 582 (1964).
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