Synthesis, crystal structure and hydrolysis of novel isomeric cage (P–C/P–O)-phosphoranes on the basis of 4,4,5,5-tetramethyl-2-(2-oxo-1,2-diphenylethoxy)-1,3,2-dioxaphospholane and hexafluoroacetone
作者:Nadezhda R. Khasiyatullina、Vladimir F. Mironov、Dmitry B. Krivolapov、Ekaterina V. Mironova、Oleg I. Gnezdilov
DOI:10.1039/c6ra17983e
日期:——
hydrolysis of the P–O-isomer initially gives 2-(2,3-dihydroxy-1,2-diphenyl-3-trifluoromethyl-4,4,4-trifluorobutyloxy)-4,4,5,5-tetramethyl-2-oxo-1,3,2-dioxaphospholane as the only stereoisomer whose structure is also confirmed by XRD. Further hydrolysis of this compound leads to the formation of 2,3-dihydroxy-3-trifluoromethyl-4,4,4-trifluoro-1,2-diphenylbutylphosphate and pinacol, which forms the solvate
4,4,5,5-四甲基-2-(2-氧代-1,2-二苯基乙氧基)-1,3,2-二氧杂膦烷与六氟丙酮的反应导致区域异构笼的同时形成(P–C / P -O)-磷光烷,其结构得到XRD的明确证实。在二氯甲烷溶液中,具有高立体选择性(> 96%)的P–C-异构体重排为P–O-异构体,同时保留了磷的配位。研究发现,P-O-异构体的逐步水解最初产生2-(2,3-二羟基-1,2-二苯基-3-三氟甲基-4,4,4-三氟丁氧基)-4,4,5, 5-四甲基-2-氧代-1,3,2-二氧杂磷杂环戊烷是唯一的立体异构体,其结构也通过X射线衍射证实。该化合物的进一步水解导致形成2,3-二羟基-3-三氟甲基-4,4,4-三氟-1,2-二苯基丁基磷酸酯和频哪醇,在晶体中形成溶剂化物。P–C-异构体的水解产生2-羟基-4,4,5,5-四甲基-2-氧代-1,3,2-二氧杂膦烷,安息香和六氟异丙醇。