Correction for An organometallic route to long helicenes

CHEMISTRY Correction for "An organometallic route to long helicenes," by Petr Sehnal, Irena G. Stara, David Saman, Milos Tichy, Jifi Misek, Josef Cvacka, Lubomir Rulisek, Jana Chocholousova, Jaroslav Vacek, Grzegorz Goryl, Marek Szymonski, Ivana Cisafova, and Ivo Stary , which appeared in issue 32, August 11, 2009, oiProc Nati Acad Sci USA (106:13169-13174; first published July 24, 2009; 10.1073/pnas.0902612106). The authors note that due to a printer's error, the legend for Scheme 2 appeared incorrectly in part. The absolute configuration prefixes appeared as lower-case letters but should have been capitalized. Additionally, part of the legend for Scheme 3 did not appear. The schemes and their corrected legends appear below.