ERNEST L. ELIEL is W. R. Kenan, Jr. Professor Emeritus at the University of North Carolina at Chapel Hill. He is the author of Stereochemistry of Carbon Compounds and Elements of Stereochemistry, coeditor of the Wiley series, Topics in Stereochemistry, and coauthor of Conformational Analysis. The recipient of numerous academic and scientific awards and honors, Professor Eliel is Past President of the American Chemical Society and a member of the National Academy of Sciences.SAMUEL H. WILEN is Professor of Chemistry at City College, City University of New York, where he has taught since 1957. Professor Wilen is the author of Tables of Resolving Agents and Optical Resolutions, coauthor of Enantiomers, Racemates and Resolutions, and coeditor of the Wiley series, Topics in Stereochemistry.

• Computer Graphics and Molecular Modeling in the Analysis ofSynthetic Targets (W. Ripka & J. Blaney). Acyclic Stereocontrol in Michael Addition Reactions of Enamines andEnol Ethers (D. Oare & C. Heathcock). Conformational Analysis of Bicyclo [3.3.1] Nonanes and Their HeteroAnalogs (N. Zefirov & V. Palyulin). Strained Olefins: Structure and Reactivity of NonplanarCarbon-Carbon Double Bonds (W. Luef & R. Keese). Subject Index. Cumulative Author Index, Volumes 1-20. Cumulative Title Index, Volumes 1-20.

ERNEST L. ELIEL is W. R. Kenan, Jr. Professor Emeritus at the University of North Carolina at Chapel Hill. He is the author of Stereochemistry of Carbon Compounds and Elements of Stereochemistry, coeditor of the Wiley series, Topics in Stereochemistry, and coauthor of Conformational Analysis. The recipient of numerous academic and scientific awards and honors, Professor Eliel is Past President of the American Chemical Society and a member of the National Academy of Sciences.SAMUEL H. WILEN is Professor of Chemistry at City College, City University of New York, where he has taught since 1957. Professor Wilen is the author of Tables of Resolving Agents and Optical Resolutions, coauthor of Enantiomers, Racemates and Resolutions, and coeditor of the Wiley series, Topics in Stereochemistry.

• Computer Graphics and Molecular Modeling in the Analysis ofSynthetic Targets (W. Ripka & J. Blaney). Acyclic Stereocontrol in Michael Addition Reactions of Enamines andEnol Ethers (D. Oare & C. Heathcock). Conformational Analysis of Bicyclo [3.3.1] Nonanes and Their HeteroAnalogs (N. Zefirov & V. Palyulin). Strained Olefins: Structure and Reactivity of NonplanarCarbon-Carbon Double Bonds (W. Luef & R. Keese). Subject Index. Cumulative Author Index, Volumes 1-20. Cumulative Title Index, Volumes 1-20.

ERNEST L. ELIEL is W. R. Kenan, Jr. Professor Emeritus at the University of North Carolina at Chapel Hill. He is the author of Stereochemistry of Carbon Compounds and Elements of Stereochemistry, coeditor of the Wiley series, Topics in Stereochemistry, and coauthor of Conformational Analysis. The recipient of numerous academic and scientific awards and honors, Professor Eliel is Past President of the American Chemical Society and a member of the National Academy of Sciences.SAMUEL H. WILEN is Professor of Chemistry at City College, City University of New York, where he has taught since 1957. Professor Wilen is the author of Tables of Resolving Agents and Optical Resolutions, coauthor of Enantiomers, Racemates and Resolutions, and coeditor of the Wiley series, Topics in Stereochemistry.

• Computer Graphics and Molecular Modeling in the Analysis ofSynthetic Targets (W. Ripka & J. Blaney). Acyclic Stereocontrol in Michael Addition Reactions of Enamines andEnol Ethers (D. Oare & C. Heathcock). Conformational Analysis of Bicyclo [3.3.1] Nonanes and Their HeteroAnalogs (N. Zefirov & V. Palyulin). Strained Olefins: Structure and Reactivity of NonplanarCarbon-Carbon Double Bonds (W. Luef & R. Keese). Subject Index. Cumulative Author Index, Volumes 1-20. Cumulative Title Index, Volumes 1-20.