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Heping Xiong

University of Nebraska–Lincoln

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Tetrahedron Letters | 1991

The magnesium complexes of 1,2-dimethylenecycloalkanes: a new method for a one-step spiroannelation

Heping Xiong; Reuben D. Rieke

Abstract Reactions of new dienemagnesium reagents prepared from highly reactive magnesium and 1,2-diemthylenecycloalkanes with 1,n-dibromoalkanes and bromoalkylnitriles provide a one-step method for the synthesis of commonly encountered spirocyclic systems.

Tetrahedron Letters | 1993

Direct synthesis of spiro δ-lactones from conjugated dienes and epoxides

Matthew S. Sell; Heping Xiong; Reuben D. Rieke

Abstract Stepwise reactions of conjugated diene-magnesium reagents with an epoxide followed by carbon dioxide provide a direct method for a one-pot synthesis of spiro δ-lactones accommodating a vinyl moiety at the β-position.

Tetrahedron Letters | 1993

Preparation of alcohols and 1,2-diols from epoxides and 1,3-dienes

Mathew S. Sell; Heping Xiong; Reuben D. Rieke

Abstract Formation of both alcohols and 1,2-diols containing a quaternary carbon center can be achieved in high yields in a one-pot synthesis utilizing active magnesium, epoxides, and 1,3-dienes.

Journal of Organic Chemistry | 1990

Organocalcium chemistry : preparation and reactions of highly reactive calcium

Tse Chong Wu; Heping Xiong; Reuben D. Rieke

Journal of Organic Chemistry | 1991

Chemistry of substituted (2-butene-1,4-diyl)magnesium: a facile approach to complex carbocycles, functionalized ketones and alcohols, and silicon-containing heterocycles

Reuben D. Rieke; Heping Xiong

Journal of Organic Chemistry | 1989

Facile formation of substituted 2-butene-1,4-diylmagnesium using highly reactive magnesium. A simple approach to complex carbocycles and functionalized ketones

Heping Xiong; Reuben D. Rieke

Journal of the American Chemical Society | 1995

Reactions of Substituted (2-Butene-1,4-diyl)magnesium Complexes with Carboxylic Esters and Lactones: Formation of a Versatile Intermediate Capable of Generating Substituted Cyclopentenols, Fused-Ring Cyclopentenols, or .beta.,.gamma.-Unsaturated Ketones

Reuben D. Rieke; Matthew S. Sell; Heping Xiong

Journal of the American Chemical Society | 1992

Reactions of magnesium complexes of 1,2-dimethylenecycloalkanes with carboxylic esters: the formation of a versatile intermediate capable of generating fused rings or .beta.,.gamma.-unsaturated ketones

Heping Xiong; Reuben D. Rieke

Journal of Organic Chemistry | 1992

One-step spiroannulation using 1,2-bis(methylene)cycloalkane-magnesium reagents

Reuben D. Rieke; Heping Xiong

Journal of Organic Chemistry | 1995

Direct Synthesis of Spiro .delta.-lactones, Spiro-.gamma.-Lactones, and Alcohols from Substituted (2-Butene-1,4-diyl)magnesium Complexes

Reuben D. Rieke; Matthew S. Sell; Heping Xiong

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Reuben D. Rieke

University of Nebraska–Lincoln

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Matthew S. Sell

University of Nebraska–Lincoln

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Mathew S. Sell

University of Nebraska–Lincoln

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Tse Chong Wu

University of Nebraska–Lincoln

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