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, C, S U P P L E M E N T A R Y NOTESPrepared for publication in Advances in Cheriistry Series.19. KEY WOROS (Co nt in ue on r ever i, aid. 11 necess ary and I d en tity by block numb.r) Photocata l ysis , cluster catalys is , photochemi stry , alkene /silane catalysis >-0~~~~2O~, ABSTRACT (Cont inu , on revers e aide if n,c..e' 'y and I d e n t if y by block ni..mb.r)Irradiation of H 3 (C0)j2 ( i-I = Fe~ Ru, Os) in the presence of 1-pentene and HSiEt~ yiel ds (n-pentyl )SiEt 3, three i somers of (pjntenyl)SIEt 3. and Abstract: Trinuc lear clusters M 3 (C0) 12 (M = Fe , Ru , Os) are reported to be useful at 298° K as photocata lysts for isomerization of alkenes and for reaction of alkenes with tria lkylsilanes. Detailed studies are reported for i somerization of the linear pentenes and for reaction of the linear pentenes with HSiEt 3. For i somerization of 1-pentene , the effectiveness of the photocata lysis is very dependent on M in the order Fe > Ru>>Os. Photocatalyzed reaction of 1-pentene with HSiEt 3 yields (n-penty l)SiEt 3, three isomers of (pentenyl)SiEt 3, and n-pentane. Especially for M = Fe , the ratio of the products depends on the ratio of HSiEt 3 and l-pentene such that excess l-pentene results in the formation of the (pentenyl )SIEt 3 as the main Si containing product. The distribution of products depends on LI and t~ noteworthy finding isthat for 1 =0s the product is mainly (n-pentyl)SiEt 3, while for LI = Fe or Ru the viny lsilanes can be the major Si containing products .Under the same conditions , Fe(CO ) 5 and Fe 3 ( CO) 12 photocatalyzed reaction gives the same product distribution implicating mononuclear fragments as the catalytically active species when starting with the cluster. Irradiation of M 3 (CO ) 12 (11 = Fe , Ru) in the presence of l-pentene ,C0

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