Phosphorus(III and V)– and arsenic(III)–nitrogen metallacycles derived from the bulky arylamido ligand NHAr (Ar = C6H2But3-2,4,6); X-ray structures of ArNPN(Ar)AIMe2 and PAr(NHAr)2
Abstract
In its co-ordination chemistry P(![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
NAr)(NHAr)(Ar = C6H2But3-2,4,6)(1a) behaves either as (i) a source of its conjugate base yielding Ar[graphic ommitted]Ln(2)[MLn= AIMe2, from (AIMe3)2] and (3)(MLn= Li, from LiBun), or (ii) as a neutral hydrido-PV ligand in [[graphic ommitted])2PH}], but the arsa(III)azene (1b)[the As analogue of (1a)] undergoes facile As–NHAr bond-scission with (AIMe3)2; whereas (1b) is obtained from 2Li(NHAr)+ AsCl3 in OEt2 at 20 °C, prolonged reflux in PhMe of the same reagents furnishes a cyclometallated product; <P–N> in (2)[1.617(4)Å] is intermediate between the PN and P–N bond lengths in (1a), and is significantly shorter than the 1.74(1)Å for <P–N> in PAr(NHAr)2[obtained from PArCl2+ 2Li(NHAr)].
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