Chemical Education Today
Corrections J. Chem. Educ. 2001, 78, 321–328 The chemical structure in Figure 6a of my article was incorrect. The correct structure is shown below. a
t
Bu
C5H11 O O N
O
O
O
O
N N
N O
O
O
N
N
N N
O
C5H11
Zn
N
N
O
O C5H11 t
Bu
D1
A1
A2
D2
Michael D. Ward School of Chemistry, University of Bristol Cantock's Close Bristol BS8 1TS, UK
[email protected] J. Chem. Educ. 2000, 77, 1358-1360 In our paper “Pólya’s Isomer Enumeration Method: A Unique Exercise in Group Theory and Combinatorial Analysis for Undergraduates”, we stated that no articles on isomer enumeration have appeared in this Journal explicitly citing the works of Pólya. This is incorrect. An article was published in the April 1988 issue of J. Chem. Educ. by Balaban, Kennedy, and Quintas. Their paper, “The Number of Alkanes Having n Carbons and a Longest Chain of Length d: An Application of a Theorem of Pólya” (J. Chem. Educ. 1988, 65, 304–313), demonstrates algorithms to elucidate all structural isomers of alkanes. It is yet another example of how combinatorial mathematics and chemistry can come together in the classroom. We apologize for the accidental overlooking of this excellent and in-depth paper. S. Pevac and G. Crundwell Department of Chemistry Central Connecticut State University New Britain, CT 06053
[email protected] J. Chem. Educ. 2001, 78, 587 The formula for n-hexane was incorrectly given as C6H12. The correct formula is C6H14.
JChemEd.chem.wisc.edu • Vol. 78 No. 8 August 2001 • Journal of Chemical Education
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