Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 8. Preparation of symmetrical and unsymmetrical 1,3-diynes from alkynoyl ylides and oxalyl diylides
摘要:
Seven examples of the alkynoyl phosphorus ylides 5 have been prepared and are found, upon flash vacuum pyrolysis (FVP) at 750 degrees C, to undergo extrusion of Ph(3)PO to give the unsymmetrical 1,3-diynes 9 in moderate yield. Six examples of the oxalyl diylides 6 have been prepared and their fully assigned C-13 NMR spectra are presented. Upon FVP, those with R = aryl undergo two-fold extrusion of Ph(3)PO to give symmetrical 1,3-diynes 13 but this requires the unusually severe temperature of 900 degrees C. In contrast those with R = CO(2)Me, CO(2)Et or COPh undergo complete reaction at 500 degrees C but afford only Ph(3)PO and fragmentation products.
Balowa I. A., Remisowa L. A., Zh. organ. khimii, 30 (1994) N 2, S 207-209
作者:Balowa I. A., Remisowa L. A.
DOI:——
日期:——
REMIZOVA L. A.; BALOVA I. A.; FAVORSKAYA I. A., ZH. ORGAN. XIMII, 22,(1986) N 11, 2459-2460
作者:REMIZOVA L. A.、 BALOVA I. A.、 FAVORSKAYA I. A.
DOI:——
日期:——
Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 8. Preparation of symmetrical and unsymmetrical 1,3-diynes from alkynoyl ylides and oxalyl diylides
作者:R. Alan Aitken、Hugues Hérion、Caroline E. R. Horsburgh、Nazira Karodia、Shirley Seth
DOI:10.1039/p19960000485
日期:——
Seven examples of the alkynoyl phosphorus ylides 5 have been prepared and are found, upon flash vacuum pyrolysis (FVP) at 750 degrees C, to undergo extrusion of Ph(3)PO to give the unsymmetrical 1,3-diynes 9 in moderate yield. Six examples of the oxalyl diylides 6 have been prepared and their fully assigned C-13 NMR spectra are presented. Upon FVP, those with R = aryl undergo two-fold extrusion of Ph(3)PO to give symmetrical 1,3-diynes 13 but this requires the unusually severe temperature of 900 degrees C. In contrast those with R = CO(2)Me, CO(2)Et or COPh undergo complete reaction at 500 degrees C but afford only Ph(3)PO and fragmentation products.
Remizova, L. A.; Balova, I. A.; Favorskaya, I. A., Journal of Organic Chemistry USSR (English Translation), 1986, vol. 22, # 11, p. 2209 - 2210
作者:Remizova, L. A.、Balova, I. A.、Favorskaya, I. A.