18 kcal/mol on the basis of the dissociation energies for the carboncarbon bonds of butane (87 kcalhol, C2-C3 bond) and n-propylbenzene (69 kcal/mol, benzylic bond).le (16) J. A. Kerr, Chem. Reo., 66,465 (1966). (17) A slight decrease in this predicted value might result if buttress-(18) NDEA Title IV Fellow, 1967-1970.ing effects present in 1 are relieved by ring opening.
from an authentic sample.12 The surprisingly efficient lactonization-migration step13 is an intriguing aspect of this synthesis and is the subject of current investigation. The utility of this approach in preparing further analogs of rosenonolactone, e.g., the 11/3-hydroxy derivative, Rosein III,9 is also under examination. Supplementary Material Available.-Complete experimental details on all compounds described in this communication will appear following these pages in the microfilm edition of this volume of the journal. Photocopies of the supplementary material from this paper only or microfiche (105 X 148 mm, 20 X reduction, negatives) containing all of the supplementary material for the papers in this issue may be obtained from the Journals Department, American Chemical Society, 1155 16th St., N.W., Washington, D. C. 20036. Remit check or money order for 83.00 for photocopy or 82.00 for microfiche, referring to code number JOC-73-4090.
A simple alarm that can be adjusted to "sound off" when the recorder pen of a preparative gas chromatograph reaches a preset height above the base line.
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