摘要:
                                [GRAPHICS]Absolute rate constants were measured for the 1,2-CH2, 1,2-cyclopropyl, and 1,2-CMe2 rearrangements of spiropentylchlorocarbene (5), [3]-trianguiylchlorocarbene (6), and tetramethylcyclopropylchlorocarbene (7), The factors responsible for the observed relative migratory aptitudes (cyclopropyl > CH2 > CMe2) were analyzed with the aid of electronic structure calculations.