Steric control of the reduction of carbodiimides by samarium(II) and the synthesis of very crowded samarium(III) complexes

Marcus L Cole, Glen Berenger Deacon, Craig Macdonald Forsyth, Peter Courtney Junk, Dorian Polo Ceron, Jun Wang

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27 Citations (Scopus)

Abstract

Reduction of N,N-di(2,6-diisopropylphenyl)carbodiimide (DippNCNDipp) by [SmL2(thf) 2] ( 1) (L = N,N-bis(2,6-diisopropylphenyl)formamidinate, DippNC(H)NDipp) in PhMe gave [Sm(L)3] ( 2) in good yield. An analogous reaction of 1 with N,N-dimesitylcarbodiimide (MesNCNMes) gave [SmL2(MesNC(H)NMes)] ( 3). In contrast, reduction of N,N-dicyclohexylcarbodiimide (CyNCNCy) by 1 in PhMe gave mixture of products from which [SmL2(CyNC(CH2Ph)NCy)] ( 4) and [SmL2(CyNC(H)NCy)] ( 5) were isolated by fractional crystallisation. Using thf as the reaction solvent, solely compound 5 was crystallised. Reactions of [Sm(L)2(CCPh)(thf)] ( 6) with the carbodiimides RNCNR (R = Cy, Mes) gave [Sm(L)2(RNC(CCPh)NR)] (R = Cy ( 7) or Mes ( 8)) which are analogues of 4. No reaction was observed between 6 and DippNCNDipp
Original languageEnglish
Pages (from-to)6732 - 6738
Number of pages7
JournalDalton Transactions
Volume39
Issue number29
DOIs
Publication statusPublished - 2010

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