Cationic Fe complexes of the general type [(Ph P) Fe(CO)(NO)]X (X=BF , BAr ) catalyze the redox-neutral cycloisomerization of 1,6- and 1,7-enyneacetates to afford bicyclic cyclobutanes under mild conditions in good yields and diastereoselectivities.

Am ethodf or the selective deuteration of polyfunctional organic molecules using catalytic amounts of [RuCl 2 (PPh 3 ) 3 ]a nd D 2 Oa sadeuterium source is presented. Throughv ariation of additives like CuI, KOH, and various amounts of zinc powder,o rthogonal chemoselectivities in the deuteration process are observed.M echanistic investigation indicates the presence of different, defined Rucomplexes under the given specific conditions. Scheme1.Activation of the precatalyst [RuCl 2 (PPh 3 ) 3 ]( 1)t hrough additives. Scheme2.Additive-directed chemoselective reductive deuteration of carbonylc ompounds and alkynes.[ a] 16 hreactiont ime.

Cycloisomerizations are powerful skeletal rearrangements that allow the construction of complex molecular architectures in an atom-economic way. We present here an unusual type of cyclopropyl enyne cycloisomerization that couples the process of a cycloisomerization with the activation of a CÀ C bond in cyclopropanes. A set of substituted non-canonical tricyclic cyclobutanes were synthesized under mild conditions using [(Ph 3 P) 2 Fe(CO)(NO)]BF 4 as catalyst in good to excellent yields with high levels of stereocontrol.

Kationische Fe-Komplexed es allgemeinen Typs [(Ph 3 P) 2 Fe(CO)(NO)]X (X = BF 4 ,B Ar F 4 )k atalyiseren die redox-neutrale Cycloisomerisierung von 1,6-und 1,7-Eninacetaten in guten Ausbeuten und Diastereoselektivitäten zu bicyclischen Cyclobutanen unter milden Bedingungen.

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