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1557mental spectrum, and, the spurious peaks produced should not be confused with the real bands.A notable feature of the analysis is the rather large moduli of the cross-ring coupling constants; nonComputer Laboratory for his help. interconverting tetrasubstituted cyclobutanes6 have a modulus of about 1 cps for this type of coupling. The Also we wish to thank Mr. D. Collens of the University remaining magnitudes. (1966). constants are in signs and (6) C. H. Krauch, 5. Farid, and G . 0. Schenck, C h a . Ber., 99, 626

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