Inversely Polarized Phosphaalkenes as Phosphinidene‐ and Carbene‐Transfer Reagents
作者:Lothar Weber、Ulrich Lassahn、Hans‐Georg Stammler、Beate Neumann
DOI:10.1002/ejic.200500454
日期:2005.11
(1i) with the ketene leads to the formation of 2-phospha-1,3-butadiene (5). The thermolabile phosphaalkene 8 decomposes into an imid-azolylidene and (tBuP), the latter species spontaneously oligomerizes to (tBuP), (n = 3, 4). Obviously, compounds 1a-e serve as a convenient source of phosphinidenes and the carbene C(NMe2)(2). A Wanzlick-type equilibrium between these species, however, must be excluded according
反极化磷烯烃 RP=C(NMe2)2 [R = tBu (1a), Cy (1b), 1-Ad (1c), Ph (1d), Mes (1e)] 与过量的二苯基乙烯酮的反应在正戊烷中得到两性离子加合物 (Me2N)(2)CC(O)=CPh2 (2) 和 3,5-dibenzhydrylidene-1,4,2-dioxaphospholanes 4a-e。Ia 与 Ph2C=C=O 在浓乙腈溶液中的反应得到 4a 和 5-benzhydrylidene-2-tert-butyl-4,4-diphenyl-1,2-oxaphospholan-3-one (6a) 作为副产物. 相反,用乙烯酮处理 Me3SiP=C(NMe2)(2) (1i) 导致形成 2-phospha-1,3-butadiene (5)。不耐热的磷烯烃 8 分解为咪唑亚基和 (tBuP),后者自发地低聚为 (tBuP), (n