Asymmetric Thermal Transformation, a New Way to Enantiopure

7278 J. Am. Chem. Soc., Vol. 121, No. 31, 1999

Additions and Corrections Asymmetric Thermal Transformation, a New Way to Enantiopure Biphenyl-Bridged Titanocene and Zirconocene Complexes: Efficient Catalysts for Asymmetric Imine Hydrogenation J. Am. Chem. Soc. 1999, 121, 15241527 MARKUS RINGWALD, RAINER STU¨RMER, HANS HERBERT BRINTZINGER* Page 1526, column 2: The products of Scheme 6 should be the (R)-enantiomers. The correct scheme is shown below.

JA9955161 10.1021/ja9955161 Published on Web 07/23/1999

Origin of the Preference for the Orbital Symmetry Forbidden Stereochemisty of the 1,5-Sigmatropic Shift of Substituted Norcaradienes [J. Am. Chem. Soc. 1999, 121, 45244525]. ACHIM KLESS, MAJA NENDEL, SARAH WILSEY, AND K. N. HOUK* Page 4525, Table 2, last column: The entry in the second row, 30.1, should be 38.1, that is the li,5s and lr,5s transition states are within 1 kcal/mol. JA995522X 10.1021/ja995522x Published on Web 07/23/1999

Additions and Corrections