Premium
Metalated 1,3‐Azaphospholes: 1H ‐1,3‐Benzazaphosphole and 1,3‐Benzazaphospholide Tungsten(0) and Tungsten(II) Complexes
Author(s) -
Heinicke Joachim,
Surana Anushka,
Peulecke Normen,
Bansal Raj Kumar,
Murso Alexander,
Stalke Dietmar
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200109)2001:10<2563::aid-ejic2563>3.0.co;2-2
Subject(s) - chemistry , tungsten , bimetallic strip , lithium (medication) , valence (chemistry) , medicinal chemistry , crystallography , inorganic chemistry , organic chemistry , metal , endocrinology , medicine
2‐ tert ‐Butyl‐1 H ‐1,3‐benzazaphosphole ( 1a ) reacts with t BuLi without addition to the P=C bond to form a lithium benzazaphospholide that affords the η 1 ‐(benzazaphospholide‐ P )tungsten(II) complex 2 upon reaction with [CpW(CO) 3 Cl]. It is sensitive to alcoholysis and to air oxidation yielding 1a and the P ‐oxo‐benzazaphospholide complex 3 , respectively. The (1,3‐benzazaphosphole)pentacarbonyltungsten complex 4 , obtained from 1b and [W(CO) 5 (THF)], reacts preferentially with t BuLi by lithiation of the NH function and is attacked by [CpW(CO) 3 Cl] at phosphorus to give the mixed valence bimetallic tungsten(II)‐tungsten(0) benzazaphospholide complex 5 . A side product, (3‐ tert ‐butyl‐2‐methyl‐1,3‐benzazaphosphole)pentacarbonyltungsten ( 6 ), is attributed to side‐reaction where t BuLi adds to the P=C bond in 4 . The composition of the products was determined from X‐ray structure analysis of 3 and spectroscopic data.