Chemistry of dioxiranes. 18. Deuterium isotope effects in the reaction of 4,4-dimethyldihydropyran with dimethyldioxirane
摘要:
The reaction of dimethyldioxirane (1) with 4,4-dimethyl-2,3-dihydro-gamma-pyran (2) gives the derived epoxide. Measured secondary deuterium isotope effects indicate that there is a greater degree of rehybridization at the beta position (5-carbon) than at the alpha position (6-carbon) in the transition state leading to epoxide. The results are compared to those reported earlier in which 2 was oxidized by singlet oxygen to give the dioxetane.
Chemistry of dioxiranes. 18. Deuterium isotope effects in the reaction of 4,4-dimethyldihydropyran with dimethyldioxirane
摘要:
The reaction of dimethyldioxirane (1) with 4,4-dimethyl-2,3-dihydro-gamma-pyran (2) gives the derived epoxide. Measured secondary deuterium isotope effects indicate that there is a greater degree of rehybridization at the beta position (5-carbon) than at the alpha position (6-carbon) in the transition state leading to epoxide. The results are compared to those reported earlier in which 2 was oxidized by singlet oxygen to give the dioxetane.