Metalated 1,3-Azaphospholes: Structure and Reactivity of 2-Lithio-1-methyl-1,3-benzazaphosphole, an Isolable −PC(Li)−NR Heterocycle
作者:Joachim Heinicke、Kinga Steinhauser、Normen Peulecke、Anke Spannenberg、Peter Mayer、Konstantin Karaghiosoff
DOI:10.1021/om010884a
日期:2002.3.1
The preparation, NMR data, a crystal structure, and the reactivity of isolable 2-lithio-1,3-benzazaphospholes are described. The compounds are or belong to the most stable PCLi species, although they lack steric congestion. Reactions with organoelement or organometal halides W(CO)6 as well as with CO2 or benzophenone allow access to various novel functionally substituted 1,3-benzazaphospholes (2-R
描述了可分离的2-lithio-1,3-benzazazale的制备,NMR数据,晶体结构和反应性。这些化合物虽然缺乏空间拥塞,但却是或属于最稳定的P CLi物种。与有机元素或有机金属卤化物W(CO)6以及与CO 2或二苯甲酮的反应可访问各种新型的功能取代的1,3-苯并氮杂磷(2-R = SnMe 3,Fe(CO)2 Cp,C [ W( CO)5 ] OLi(THF)3,CPh 2 OH,PPh 2,P(O)Ph 2)。描述了钨-卡宾衍生物的晶体结构。尝试锂化和功能化1,3-benzazaphosphole P-W(CO)5配合物失败,但是1-甲基-2-锡烷基和1-甲基-2-膦基-1,3-benzazaphosphole与W(CO)的反应)5(THF)分别提供了2-金属化的苯并氮杂磷P-W(CO)5配合物和膦基取代基的优选配合物的例子。在低配位的磷原子被W(CO)5络合后,31 P NMR