Differing substituent effects on rates and regioselectivities in the di-π-methane rearrangement. New photochemical theory: excitation distribution (the ΔP matrix), reaction inhibition by vertical excited state stabilisation, ground Vs. excited state control
作者:Howard E. Zimmerman、William T. Gruenbaum、Robert T. Klun、Mark G. Steinmetz、Thomas R. Welter
DOI:10.1039/c39780000228
日期:——
consistent pattern of control of regioselectivity by substituents was observed in three di-π-methane systems while the effect on rates varied with the system; from this three new concepts were derived: (i) a method allowing one to discern how excitation energy is partitioned throughout a molecule initially and during transformation to product, (ii) evidence that excessive verticalexcitedstate stablization
Remarkable Observations on Triplet-Sensitized Reactions. The Di-π-methane Rearrangement of Acyclic 1,4-Dienes in the Triplet Excited State
作者:Diego Armesto、Maria J. Ortiz、Antonia R. Agarrabeitia、Mar Martin-Fontecha、Noureddin El-Boulifi、Gonzalo Duran-Sampedro、Danielle Enma
DOI:10.1021/ol901636z
日期:2009.9.17
large majority of acyclic 1,4-dienes do not undergo photochemical di-π-methane (DPM) rearrangement under triplet-sensitized irradiation. The results of a detailed analysis of these processes demonstrate that a series of these compounds do indeed undergo highly efficient DPM rearrangement from their triplet excited states when suitable triplet sensitizers are used.