Reaction of 1-{(pentamethylcyclopentadienyl)(dicarbonyl)ferrio}-2-(2,4,6-tri-tert-butylphenyl)diphosphene with 1,2,4-triazoline-3,5-diones: formations and structures of the first 1,2-diaza-3,4-diphosphetidines and E,E-1,7-dioxa-4,5,10,11-tetraaza-3,4,8,9-tetraphosphacyclododeca-5,11-diene

Abstract

Reaction of [(η⁵-C₅Me₅)(CO)₂Fe–PP–MeS*]1(Mes*= 2,4,6-Bu^t₃C₆H₂) with 1,2,4-triazoline-3,5-diones [[graphic omitted](O)]2(a: R = Ph; b: R = 4-EtOC₆H₄) in benzene at ambient temperature affords the first 1,2-diaza-3,4-diphosphetidines as part of the bicyclic compounds 4, whereas in diethyl ether solution the twelve-membered macrocycle 5 is obtained.