Stabilization of reactive aldehydes by complexation with methylaluminum bis(2,6-diphenylphenoxide) and their synthetic application
作者:Keiji Maruoka、Arnel B. Concepcion、Noriaki Murase、Masataka Oishi、Naoki Hirayama、Hisashi Yamamoto
DOI:10.1021/ja00063a013
日期:1993.5
Reactive aldehydes such as formaldehyde and α-chloro aldehydes can be successfully generated by treatment of readily available trioxane and α-chloro aldehyde trimers, respectively, with methylaluminum bis(2,6-diphenylphenoxide) (MAPH), and stabilized as their 1:1 coordination complexes with MAPH. The resulting CH 2 =O.MAPH complex reacts with a variety of olefins to furnish ene-reaction products with
Scope and limitations of the stereoselective homogeneous hydrogenation of methylenecyclohexanols by cationic rhodium complexes
作者:John M. Brown、Stephen A. Hall
DOI:10.1016/s0040-4039(01)80167-2
日期:1984.1
Homogeneous catalytic hydrogenation of 3-methylenecyclohexanol gives -3-methylcyclohexanol with 98% stereoselectivity. but low selectivity is observed for 2-methylenecyclohexanol and 2-methylenecyclohexanemethanol.
Synthetic Studies on CP-225,917 and CP-263,114: Access to Advanced Tetracyclic Systems by Intramolecular Conjugate Displacement and [2,3]-Wittig Rearrangement
作者:Farzad Malihi、Derrick L. J. Clive、Che-Chien Chang、Minaruzzaman
DOI:10.1021/jo302467w
日期:2013.2.1
An advanced intermediate related to the structures of CP-225,917 and CP-263,114 was constructed by a sequence based on the use of Grob-like fragmentation, intramolecular conjugate displacement, and [2,3]-Wittigrearrangement. A variant of the [2,3]-Wittigrearrangement was developed.
Dimethylaluminum chloride catalyzed ene reactions of aldehydes
作者:Barry B. Snider、David J. Rodini、Thomas C. Kirk、Robert Cordova
DOI:10.1021/ja00366a031
日期:1982.1
Formaldehyde Encapsulated in Zeolite: A Long-Lived, Highly Activated One-Carbon Electrophile to Carbonyl-Ene Reactions
作者:Takahiro Okachi、Makoto Onaka
DOI:10.1021/ja039737p
日期:2004.3.3
Gaseous formaldehyde is extremely unstable and readily undergoes self-polymerization to a solid paraformaldehyde or disproportionation to methanol and formic acid in the presence of moisture. We disclose a simple method to stably store such a labile formaldehyde as a monomer in a nanoporous faujasite zeolite at 5 degrees C for at least 50 days without self-polymerization or disproportionation. The greater stability of formaldehyde encapsulated in zeolite was confirmed by 13C MAS NMR spectroscopy. Formaldehyde was not only stabilized within the zeolite cages but functioned as a powerful electrophile toward various olefins. Zeolite-encapsulated formaldehyde was proved to be a stable but highly reactive C1 reagent.