Organometallics 1994,13, 1537
1537
Additions and Corrections 1993,Volume 12 Imre T6th, Ipin Guo,and Brian E. Hanson? Influence of the Reaction Temperature on the Enantioselection of Styrene Hydroformylation Catalyzed by PtCl(SnCl3) Complexes of p- Aryl-Substituted Chiral Ligands. Page 850. The absolute configurations of optically active 2-phenylpropanal hydroformylation products are erroneously given in Figure 1 and Table 11. In addition, the reaction temperatures at which the hydroformylation experiments were carried out are not shown in the footnote for Table 11. Two typos also occur in the first sentence of the first new paragraph in the text. The correct sentence reads as follows: The conversion of styrene was intentionally kept low in order to minimize the racemization of the produ~t.~J~ The correct forms of Figure 1 and Table I1 are given below.
20
d
40 60
80 30 60 90 120 Reactlon Temperature (Tc)
Figure 1. Platinum hydroformylation enantioselectivityas a function of reaction temperature: (0) 1; (0)2; (0)3; (0) PtCl(SnCl$[ ( S , ~ ~ S ) - B D(0) P PPtCl(SnCl,d[(RP)-DIOPl;321 I;~~ (*) PtCl(SnC13)[(S,S)-Chiraphosl.21 Table 11. Influence of Solvents on the Asymmetric Hydroformylation of Styrene Catalyzed by 1. solvent hexane benzene toluene C,jH&l
MEK THF TOFd TOFd*
teacn time (h) 20 5 3 6 28 22 21 60
mnversn to aldehydcs (%) 31.7 43.3 28.6 22.5 7.9 22.7 37.6 7.8
regioselectivity (n/bY 3.4 4.1 3.2 3.7 3.4 4.3 3.3 1.9
.
conversn to ethylbenzene (5%) 4.6 2.6 4.0 3.5 0.5 5.9 0 0
enantioselectivity (% 4 23.6 (R) 27.1 ( R ) 37.4 ( R ) 36.4 (R) 27.2 (R) 32.9 (R) 2.9 ( R ) 4.0 (S)
turnover frequency @-I) 23.2 91.2 108.6 43.3 3.0 13 17.9 1.6
Reaction conditions: substrate/Pt = 1OOO/1, Sn/Pt = 3/1,0.015 mmol Pt in 10 mLof solvent, 70 bar of H&O ( l / l ) , 100 OC. 6 Linear/branched product. (mol of product/mol of catalyst)/h. dTOF = triethyl orthoformate. e At 60 OC.
0276-733319412313-1537$04.50/0 0 1994 American Chemical Society
