Synthese photochimique et etude structurale d'alcoxy-spirocetals et de trioxa-bis-spirocetals
作者:L. Cottier、G. Descotes、M.F. Grenier、F. Metras
DOI:10.1016/s0040-4020(01)88911-0
日期:1981.1
The spiroketal systems can be obtained easily by a Norrish type II reaction applied to tetrahydropyranic ketoacetals having a carbonyl group in δ position of the acetalic hydrogen. The structures of spirans and bispirans established by IR, NMR (1H and 13C show an axial conformation for the C-O bond of the tetrahydrofuran ring. With the bispirans this anomeric effect requires for some isomers a twist
螺缩醛酮体系可以容易地通过将Norrish II型反应应用于在乙缩醛氢的δ位具有羰基的四氢吡喃酮缩醛得到。通过IR,NMR(1 H和13 C)建立的螺环和双螺环的结构显示出四氢呋喃环的CO键的轴向构象。