Methyltriphenoxyphosphonium iodide (MTPI); induced dehydration and dehydrohalogenation in aprotic solvents
作者:Charles W. Spangler、Douglas P. Kjell、Lori L. Wellander、Mary A. Kinsella
DOI:10.1039/p19810002287
日期:——
Methyltriphenoxyphosphoniumiodide (MTPI) is an effective dehydration and dehydrohalogenation reagent under mild conditions when 1,3-dimethylimidazolidin-2-one is used as an aprotic solvent in place of the more normally used hexamethylphosphoric triamide (HMPT). Since previously suggested mechanisms had proposed alcohol–HMPT interaction as an important mechanistic step, this result coupled with comparative
1,4-cycloheptylene and the related allylic diradicals. Thermal nitrogen extrusion from 6,7-diazabicyclo[3.2.2]Non-6-enes
作者:Tadao Uyehara、Masayuki Takahashi、Tadahiro Kato
DOI:10.1016/s0040-4039(00)98443-0
日期:1985.1
Thermal nitrogen extrusion of 2-methylene-6,7-diazabicyclo[3.2.2]non-6-enes and 6,7- diazabicyclo[3.2.2]nona-2,6-diene,6 proceeded easily to give closure and cleavage products via the corresponding 5-methylene-1,4-cycloheptylenes and 4-cyclohepten-1,3-ylenes, respectively.