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    The first neutral, mononuclear 4f metal thiolates and new methods for corresponding aryl oxides and bis(trimethylsilyl)amides
    (1992) Cetinkaya B.; Hitchcock P.B.; Lappert M.F.; Smith R.G.
    The first neutral, mononuclear 4f thiolates, [Sm(SAr)3] 1 and [Yb(SAr)2(dme)2] 2, have been prepared, and X-ray characterised [<Sm-S> 2.645(9) Å, <Yb-S> 2.756(8) Å], 1 from [Sm(CHR?2)3] + 3ArSH and 2 from [Yb(NR?2)2(dme)2] [obtained from Yb + Sn(NR?2)2]; 1 was not readily accessible from ArSH and Yb in liquid NH3, although replacing ArSH by Ar?OH yielded [Yb(OAr?)2(thf)3] [Ar = C6H 2But3-2,4,6; Ar? = C6H 2But2-2,6-Me-4; R? = SiMe 3? dme = (MeOCH2)2, thf = OC 4H8].
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    Synthesis and characterisation of unusual tetraaminoalkenes (enetetramines)
    (1992) Çetinkaya E.; Hitchcock P.B.; Jasim H.A.; Lappert M.F.; Spyropoulos K.
    Two general routes are described for the synthesis of the title compounds from the reaction of either (A) the dimethyl acetal of N,N-dimethylformamide and an appropriate N,N?-bis(secondary amine), or (B) sodium hydride and a 4,5-dihydroimidazolium or tetrahydropyrimidinium salt. The following new compounds have been made: (Chemical Equation Presented) X-Ray data on crystalline [CN(R)(CH2)2NR]2 (R = CH 2Ph) and (2b) [data in parentheses] show a short C=C bond, 1.319(8) Å [1.329(5) Å], long Csp2-N bonds, av. 1.437(11) Å [1.424(4) Å], with each of the four nitrogen atoms in a pyramidal sp 3 environment.